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Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Degré recouvrement, Coverage rate, Grado recubrimiento, Diffraction RX, X ray diffraction, Difracción RX, Roentgenbeugung, Frein disque, Disk brake, Freno disco, Microdureté, Microhardness, Microdureza, Mikrohaerte, Microstructure, Microestructura, Mikrogefuege, Nitruration, Nitriding, Nitruración, Nitrieren, Temps traitement, Processing time, Tiempo proceso, Titane alliage, Titanium alloy, Titanio aleación, Titanlegierung, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Usure, Wear, Desgaste, Verschleiss, Brakes/clutches, Hardness, Laser processing, Optical microscopy, Sliding wear, and Wear testing

Ti-6Al-4V was laser surface nitrided using a rectangular beam intended for large area coverage at minimal processing time. The laser nitriding performed at different energy densities yielded the formation of ~120 μm thick TiN layer. Metallurgical characterization was performed using Optical Microscope (OM), Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) analysis. A hardness improvement up to 760 HV0.2 was achieved compared to the base material hardness of 315 HV0.2. The tribological characterization of laser nitrided Ti-alloy exhibited superior performance, indicating the possibility of using it as a light weight disk brake rotor than the heavier gray cast iron.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Acier, Steel, Acero, Boruration, Boriding, Boruración, Borieren, Contrainte thermique, Thermal stress, Tensión térmica, Waermespannung, Essai usure, Wear test, Prueba al desgaste, Verschleissversuch, Hétérodiffusion, Impurity diffusion, Heterodifusión, Microstructure, Microestructura, Mikrogefuege, Résistance usure, Wear resistance, Resistencia al desgaste, Verschleissfestigkeit, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Usure glissement, Sliding wear, Desgaste deslizamiento, Gleitverschleiss, Couche usure, Wear layer, Diffusion treatments, High temperature, Thermal effects, and Wear testing

This study focuses on the high temperature tribological behaviour of the boride layers generated on 4140 steel by pack boriding process. Boriding at 750 and 800 C resulted in a single phase (Fe2B) boride layer, while a dual phase (Fe2B + FeB) boride layer was developed at 850 and 900 °C. Sliding wear tests conducted by rubbing an alumina ball revealed that single and dual-phase boride layers exhibited almost similar tribological performances and superior wear resistances at room temperature. With increasing testing temperature, boride layers exhibited different wear behaviours depending on their phase structure so that, dual phase boride layer yielded better wear resistance than single phase boride layer, especially at the testing temperature of 300 °C.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Coefficient frottement, Friction coefficient, Coeficiente roce, Reibungskoefficient, Diffraction RX, X ray diffraction, Difracción RX, Roentgenbeugung, Dureté, Hardness, Dureza, Haerte, Frottement, Friction, Frotamiento, Reibung, Implantation ion, Ion implantation, Implantación ión, Ionenimplantation, Nanoindentation, Nanoindentacion, Profil profondeur, Depth profile, Perfil profundidad, Tiefenprofil, Propriété surface, Surface properties, Propiedad superficie, Oberflaecheneigenschaft, Spectre Raman, Raman spectrum, Espectro Raman, Spectre photoélectron RX, X-ray photoelectron spectra, Titane alliage, Titanium alloy, Titanio aleación, Titanlegierung, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Usure, Wear, Desgaste, Verschleiss, Carbiding, Carbon depth profile, and Titanium alloys

Carbon implantation into titanium is known to enhance some of its surface properties like wear behavior, mechanical hardness or the friction coefficient. Therefore the method is a candidate to be applied as a powerful surface engineering tool for titanium alloys. Recently, a new implantation technique has been developed, which is based on a compact particle accelerator device that is easy to handle. The device allows simultaneous multi-charged ion-implantation (from C+ up to C4+) in order to get a plateau like implantation profile based on the energetic distribution. The aim of this study is to investigate microstructural modifications of the near surface region of Ti-6Al-4V due to this processing technology and to enhance the surface performance. Nanoindentation and tribological measurements revealed a threshold of critical C contents where friction coefficient and wear are significantly reduced. Furthermore, these enhancements have been correlated to the presence of additional graphitic carbon.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Alliage base cuivre, Copper base alloys, Cavitation, Cavitación, Kavitation, Contrainte résiduelle, Residual stress, Tensión residual, Eigenspannung, Diffraction neutron, Neutron diffraction, Difracción neutrónica, Neutronenbeugung, Erosion, Erosión, Fusion laser, Laser fusion, Fusión láser, Joint grain, Grain boundary, Limite grano, Korngrenze, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Rasterelektronenmikroskopie, Microstructure, Microestructura, Mikrogefuege, Métal transition alliage, Transition metal alloy, Metal transición aleación, Uebergangsmetallegierung, Métal transition, Transition metal, Metal transición, Uebergangsmetalle, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Cavitation erosion, and Nickel-Aluminium Bronze

In this study two types of laser surface treatment, laser surface melting and laser processing, were used to treat the surface of as cast Nickel―Aluminium Bronze. The two treatments were then subjected to cavitation erosion testing and were compared against as-cast Nickel―Aluminium Bronze. While the cavitation performance of the two types of laser surface treatment was equivalent, the morphology of the eroded surfaces was different. Several materials characterisation techniques including neutron diffraction for residual stress measurements and SEM were used to explain why the two eroded surfaces were different. It was found that the tensile residual stresses in the laser melted sample weakened the sample, which negated its superior strength when compared with the laser processed sample. It was also observed that the erosion and pitting in the laser melted sample were deeper and they were attributed to the tensile residual stresses accelerating the attack at grain boundaries.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Transformation de matériaux métalliques, Production techniques, Traitements de surface, Surface treatment, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Acier allié, Alloy steel, Acero aliado, Legierter Stahl, Cavitation, Cavitación, Kavitation, Composé minéral, Inorganic compound, Compuesto inorgánico, Erosion, Erosión, Microstructure, Microestructura, Mikrogefuege, Morphologie surface, Surface morphology, Mécanisme usure, Wear mechanisms, Mecanismo desgaste, Verschleissmechanismus, Nitruration, Nitriding, Nitruración, Nitrieren, Recuit, Annealing, Recocido, Gluehen, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Traitement thermique, Heat treatment, Tratamiento térmico, Waermebehandlung, Trempe et revenu, Quenching and tempering, Temple y revenido, Vergueten, Usure, Wear, Desgaste, Verschleiss, Cavitation erosion, Diffusion treatments, Erosion testing, and Steel

In the design of hydraulic machines, the selection of the correct materials and the application of surface treatments are essential to improve the cavitation resistance of components. In this investigation, the cavitation erosion behavior of the compound and of the diffusion layer of ion-nitrided 34 CrAINi 7 steel was studied. Before nitriding, the 34 CrAlNi 7 steel was heat treated by quenching and tempering and by annealing, generating microstructures that are used or could be used in the production of parts. The cavitation tests were carried out according to the ASTM G32-98 standard method. The nitriding microstructure and the wear mechanisms were analyzed using scanning electron microscopy, X-ray diffraction and laser interferometry. The results showed that the compound layer had a deleterious effect. It led to a reduction in the incubation time and to a high wear rate at the beginning of the test. Afterwards, the wear rate stabilized, but it was higher than that measured on the nitride samples without the compound layer. The main wear mechanism in the compound layer was microcracking. The initial steel microstructure had no effect on the cavitation erosion performance.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Automobile, Motor car, Automóvil, Kraftwagen, Couche mince, Thin film, Capa fina, Duennschicht, Frottement, Friction, Frotamiento, Reibung, Lubrifiant, Lubricant, Lubricante, Schmiermittel, Modèle phénoménologique, Phenomenological model, Modelo fenomenológico, Mécanisme usure, Wear mechanisms, Mecanismo desgaste, Verschleissmechanismus, Métal transition, Transition metal, Metal transición, Uebergangsmetalle, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Tôle, Sheet metal, Chapa, Blech, Usure, Wear, Desgaste, Verschleiss, Zinc, Zink, Couche usure, Wear layer, Zn, Lubricant additives, Physical and chemical modification, and Products of wear

This paper presents the results of an investigation into tribological wear of thin layers of zinc from the surface of car-body sheets during friction. The tribological tests were conducted with the use of an apparatus for drawing metal sheets. The influence of greases on the values of friction as well as on the diverse types of wear of top layers of zinc is analysed. The main emphasis is put on the mechanisms of wear affecting the top layers of zinc as well as on physical and chemical modification of the surfaces of mating elements. The author proposes a phenomenological model of tribological wear of zinc from the surface of car-body sheets.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Corrosion, Action des agents de corrosion, Corrosion environments, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Adhérence, Adhesion, Adherencia, Adhaesion, Broyeur attrition, Attrition mill, Molino atrición, Couche transition, Transition layer, Capa transición, Frottement glissement, Sliding friction, Frotamiento deslizamiento, Microstructure, Microestructura, Mikrogefuege, Multicouche, Multiple layer, Capa múltiple, Mehrfachschicht, Mécanisme usure, Wear mechanisms, Mecanismo desgaste, Verschleissmechanismus, Métal transition, Transition metal, Metal transición, Uebergangsmetalle, Oxydation, Oxidation, Oxidación, Structure lamellaire, Lamellar structure, Estructura lamelar, Lamellargefuege, Titane, Titanium, Titanio, Titan, Traitement mécanique, Mechanical treatment, Tratamiento mecánico, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Usure glissement, Sliding wear, Desgaste deslizamiento, Gleitverschleiss, Ti, Friction, Sliding, Thermal oxidation, Tribology, and Wear

In the present work, the unlubricated sliding friction and wear characteristics of thermally oxidized commercially pure titanium have been investigated. Thermal oxidation of CP-Ti was undertaken at a temperature of 625 °C for durations of 5,20 and 72 h. This results in a multi-layered structure comprising a titanium dioxide layer (rutile) atop of an a-titanium oxygen diffusion zone (α-Ti(O)). During unlubricated sliding against an alumina counterface, four distinct frictional zones can be observed for each of the oxidized samples. Analysis of wear track morphology shows distinct wear mechanisms for each frictional zone. The observed frictional zones correlate well with the oxide layer, the transition between the oxide layer and the diffusion zone, the oxygen diffusion zone and the substrate. For longer duration oxidation, the rutile oxide layer produced becomes a scale with poor adhesion to the oxygen diffusion zone. Initial attempts have also been made to improve the frictional behavior of the oxide layer, using a prior surface mechanical attrition treatment (SMAT) and controlled slow cooling after oxidation. The results demonstrate that these prior and post treatments have a positive effect on the tribological performance of the oxide layer.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Métrologie industrielle. Contrôle, Industrial metrology. Testing, Généralités, General, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Coefficient frottement, Friction coefficient, Coeficiente roce, Essai bille sur disque, Ball on disk testing, Ensayo de resistencia de bola sobre disco, Essai usure, Wear test, Prueba al desgaste, Etat surface, Surface conditions, Estado superficie, Etude expérimentale, Experimental study, Estudio experimental, Frottement glissement, Sliding friction, Frotamiento deslizamiento, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Métrologie surface, Surface metrology, Metrología superficie, Profilométrie, Profilometry, Perfilometría, Propriété surface, Surface properties, Propiedad superficie, Surface rugueuse, Rough surface, Superficie rugosa, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Ultrason, Ultrasound, Ultrasonido, Usure glissement, Sliding wear, Desgaste deslizamiento, Micro-dimple, Sliding friction coefficient, and Ultrasonic nanocrystalline surface modification (UNSM) process

It is well known that dimpled surface can improve tribological characteristics. The fundamental aim of the present research is to demonstrate the process of making micro-dimples by ultrasonic nanocrystalline surface modification (UNSM) technology and to evaluate its effects on tribological characteristics. Ball-on-disk test was performed in order to reveal the influence of mechanism and micro-dimples. UNSM-treated surface is compared to ground surface and friction coefficient of the UNSM-treated surface has been reduced by about 25%, which is a significant phenomenon in improving tribological properties of mating surfaces. Wear volume loss of UNSM-treated surface has also been reduced by about 60%. Scanning electron microscopy (SEM) and surface roughness profile measurement were utilized to study the worn surface.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Domaines classiques de la physique (y compris les applications), Fundamental areas of phenomenology (including applications), Mécanique des solides, Solid mechanics, Mécanique des structures et des milieux continus, Structural and continuum mechanics, Mécanique de la rupture (fissure, fatigue, endommagement...), Fracture mechanics (crack, fatigue, damage...), Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Mécanique de précision. Horlogerie, Precision engineering, watch making, Acier allié, Alloy steel, Acero aliado, Analyse contrainte, Stress analysis, Análisis tensión, Densification, Densificación, Diffraction RX, X ray diffraction, Difracción RX, Durcissement superficiel, Surface hardening, Endurecimiento superficial, Epaisseur, Thickness, Espesor, Equipement industriel, Industrial equipment, Equipo industrial, Essai normalisé, Standard test, Ensayo normalizado, Essai pion disque, Pin disk test, Ensayo barra disco, Essai usure, Wear test, Prueba al desgaste, Etude expérimentale, Experimental study, Estudio experimental, Fatigue, Fatiga, Frittage, Sintering, Sinterización, Grenaillage, Shot peening, Granalla, Machine pointe disque, Pin on disk machine, Máquina espiga disco, Microdureté, Microhardness, Microdureza, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Métal, Metal, Métallurgie poudre, Powder metallurgy, Metalurgia polvo, Nitruration, Nitriding, Nitruración, Porosité, Porosity, Porosidad, Radiographie RX, X ray radiography, Radiografía RX, Résistance matériau, Strength of materials, Resistencia material, Résistance usure, Wear resistance, Resistencia al desgaste, Texture, Textura, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure, Wear, Desgaste, Technologie poudre, Powder technology, Tecnología polvo, Pin on disk tests, and Surface densification

Powder metallurgy (PM) processing of steels typically results in a material characterized by residual porosity reducing the mechanical strength of the material. That is why mechanical components produced from PM steels for high demanding applications often require a surface hardening in order to improve both the fatigue and the wear resistance. Among the surface treatments, gas nitriding assures economic advantages but the presence of interconnected porosity also makes the core structure involved by the diffusional phenomena. In this paper gas nitriding is proposed in combination with shot peening, as a surface densification technique, to improve the wear performances of PM components from prealloyed powder. 40 mm diameter, 9.85 mm thickness disks were pressed at 7.0 g/cm3 density from a pre-alloyed powder (1.5% Cr, 0.5% Mo), with 0.8% graphite. The disks were sintered at 1120°C, 30 min, in N2―H2 (90-10) atmosphere in an industrial equipment. Four conditions of the disks were examined: as-sintered, sintered and gas nitrided, sintered and shot-peened, sintered-shot peened-gas nitrided. The disks were characterized by experimental tests: dimensional variations, macro and microhardness profiles, LOM observations, surface texture analysis, residual stress analysis by X-Ray technique and pin on disk wear tests. The results of the wear tests were fulfilled with observations by SEM and new interesting interpretations of the involved mechanisms were proposed by the application of the energetic approach and non-standard wear tests.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Joints et garnitures d'étanchéité, Seals and gaskets, Alliage base cobalt, Cobalt base alloys, Caoutchouc, Rubber, Caucho, Cobalt alliage, Cobalt alloy, Cobalto aleación, Contact glissant, Sliding contact, Contacto deslizante, Contact mécanique, Mechanical contact, Contacto mecánico, Indentation, Indentación, Joint lèvre, Lip seal, Junta labio, Joint étanchéité, Seal, Soldadura estanqueidad, Microdureté, Microhardness, Microdureza, Microscopie électronique transmission, Transmission electron microscopy, Microscopía electrónica transmisión, Microstructure, Microestructura, Métal, Metal, Nanoindentation, Nanoindentacion, Nanostructure, Nanoestructura, Perçage, Boring, Agujereamiento, Résistance usure, Wear resistance, Resistencia al desgaste, Spectrométrie dispersive, Dispersive spectrometry, Espectrometría dispersiva, Stellite, Technologie faisceau ion focalisé, Focused ion beam technology, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure abrasive, Abrasive wear, Desgaste abrasivo, FIB, and TEM

In the present paper, the in-service wear mechanisms and cross-sectional microstructural evolution of a Stellite 6B cobalt-based alloy subjected to sliding contact conditions were analysed by focused ion beam (FIB), transmission electron microscopy (TEM) and nanoindentation techniques. Samples under investigation consisted of a lip-seal adopted in a tunnel boring machine (TBM). In the working conditions, the lip-seal is in sliding contact with a rubber seal in a pressurised oil environment. In this specific case, an unexpected low wear resistance was observed during service, and a long machine downtime was necessary to remove the component. Results of FIB-SEM/EDS characterisation showed deep grooving due to sand (SiO2) particles embedded in the rubber seal inside the contact area, while three-body abrasive wear is observed immediately outside it. Microstructural evaluation of Stellite 6 B Co-based alloy of the cross-section also showed the presence of a nano-crystalline hardened layer with diffuse presence of stacking faults. The presence of a tribo-film with a complex structure was also clearly observed. It is concluded that wear resistance of such components could be significantly enhanced either by a proper control of abrasive contaminant particles in the lubricant oil or by introducing surface microstructural modifications of the component (e.g. a nanostructured thick coating).

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Acier, Steel, Acero, Brunissage, Burnishing, Brunido, Coefficient frottement, Friction coefficient, Coeficiente roce, Dépôt immersion, Dip coating, Depósito inmersión, Etat surface, Surface conditions, Estado superficie, Force adhérence, Adhesive strength, Fuerza adherencia, Fusion laser, Laser fusion, Fusión láser, Lubrifiant solide, Solid lubricant, Lubrificante sólido, Métal, Metal, Pressage chaud, Hot pressing, Prensado caliente, Procédé revêtement, Coating process, Procedimiento revestimiento, Revêtement tribologique, Tribological coatings, Sulfure de molybdène, Molybdenum sulfide, Molibdeno sulfuro, Texturation, Texturación, Texture, Textura, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure, Wear, Desgaste, Hot-pressing, Laser surface texturing, MoS2 coatings, Solid lubrication, and Wear life

Deposition of solid lubricant on the textured surface is an effective way to improve tribological properties of counterparts. In this paper, MoS2 solid lubricant coating was fabricated by a combination technology of laser texturing and hot-pressing. The influences of preparation methods and texture density on the tribological properties of coatings were also investigated. Research results show that a thicker and denser coating having better adhesion with the textured steel substrate was fabricated by this combination technology, which results in excellent tribological properties. The friction coefficients of hot pressed coatings are less than 0.1. The wear life of hot pressed coating can be reached 90min with a texture density of 8.5%, which is 15 times higher than that of coating fabricated by burnishing. In addition, the wear life of hot pressed coating significantly increases with the increase of texture density. The possible friction reduction and wear resistant mechanisms are discussed.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Mécanique de précision. Horlogerie, Precision engineering, watch making, Alumine, Alumina, Alúmina, Coefficient frottement, Friction coefficient, Coeficiente roce, Céramique, Ceramic materials, Cerámica, Dépôt chimique phase vapeur, Chemical vapor deposition, Depósito químico fase vapor, Etat surface, Surface conditions, Estado superficie, Etude expérimentale, Experimental study, Estudio experimental, Métal, Metal, Polissage mécanique, Mechanical polishing, Pulido mecánico, Revêtement céramique, Ceramic coating, Revestimiento cerámico, Revêtement dur, Hard coating, Revestimiento duro, Rugosité, Roughness, Rugosidad, Sablage, Sand blasting, Enarenación, Surface rugueuse, Rough surface, Superficie rugosa, Température ambiante, Room temperature, Temperatura ambiente, Topographie surface, Surface topography, Traitement surface, Surface treatment, Tratamiento superficie, Transfert, Transfer, Transferencia, Tribologie, Tribology, Tribología, Usinage jet abrasif, Abrasive jet machining, Maquinado chorro abrasivo, Usure abrasive, Abrasive wear, Desgaste abrasivo, Al2O3, CVD, and Post-treatment

The tribological behaviour of post-treated CVD α- and κ-Al2O3 hard coatings is investigated in this study between room temperature and 900 C. Friction and wear are correlated to the different coating surface topographies in the as-deposited state and generated by metal-blasting with AlSi granulate or polishing. As a result of its higher surface roughness, the quantity of AlSi transfer material is considerably higher for α- compared to κ-Al2O3. The coefficient of friction is comparable for both Al2O3 modifications and for all testing temperatures. Increased wear is observed for metal-blasted surfaces, especially for α-Al2O3 at high temperatures, which can be attributed to generation of abrasive wear debris by oxidation of the transfer material. Polishing reduces wear due to a decrease in surface roughness.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Domaines classiques de la physique (y compris les applications), Fundamental areas of phenomenology (including applications), Mécanique des solides, Solid mechanics, Mécanique des structures et des milieux continus, Structural and continuum mechanics, Mécanique de la rupture (fissure, fatigue, endommagement...), Fracture mechanics (crack, fatigue, damage...), Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Propriétés et essais, Properties and testing, Propriétés physiques, Physical properties, Propriétés mécaniques, Mechanical properties, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Adhérence, Adhesion, Adherencia, Angle contact, Contact angle, Angulo contacto, Carbone, Carbon, Carbono, Etat surface, Surface conditions, Estado superficie, Ethylène(tétrafluoro) polymère, Tetrafluoroethylene polymer, Etileno(tetrafluoro) polímero, Fibre carbone, Carbon fiber, Fibra carbón, Gravure plasma, Plasma etching, Grabado plasma, Gravure sèche, Dry etching, Grabado seco, Matériau composite, Composite material, Material compuesto, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Nanocomposite, Nanocompuesto, Optimisation, Optimization, Optimización, Oxyde de titane, Titanium oxide, Titanio óxido, Rupture, Ruptura, Résistance usure, Wear resistance, Resistencia al desgaste, Topographie surface, Surface topography, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure, Wear, Desgaste, Fracture, Polymer-matrix composite, and Polymers

Various modified carbon fabric (CF)/polytetrafluorothylene (PTFE) composites were prepared by means of CF surface treatment, i.e. air-plasma treatment and HNO3 etching, introduction of nano-TiO2 and combined methods. The composites were evaluated for their tribological behaviors and the worn surfaces were observed by a scanning electron microscope (SEM) to understand the mechanism. The water contact angle and the surface topography of the untreated and surface-treated CF were also analyzed. It was found that the surface treatment improved the surface hydrophilicity and changed the surface topography of CF, which contributed to improve the interfacial adhesion of the composites and hence the tribological behaviors. The inclusion of 4wt% nano-TiO2 provided the optimum wear resistance among the nano-TiO2 modified composites. There was a cooperating effect of CF air-plasma treatment and 4 wt% nano-TiO2 modification to the wear-reduction of the composites.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Carbure de tungstène, Tungsten carbide, Wolframio carburo, Carbure fritté, Cemented carbides, Carburo sinterizado, Cobalt alliage, Cobalt alloy, Cobalto aleación, Coefficient frottement, Friction coefficient, Coeficiente roce, Essai usure, Wear test, Prueba al desgaste, Etat surface, Surface conditions, Estado superficie, Frottement glissement, Sliding friction, Frotamiento deslizamiento, Frottement sec, Dry friction, Frotamiento seco, Fusion laser, Laser fusion, Fusión láser, Fusion surface, Surface melting, Fusión superficie, Laser, Láser, Lubrifiant solide, Solid lubricant, Lubrificante sólido, Surface lisse, Smooth surface, Superficie lisa, Texturation, Texturación, Texture, Textura, Titane alliage, Titanium alloy, Titanio aleación, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure glissement, Sliding wear, Desgaste deslizamiento, Cemented carbide, Laser processing, and Solid lubricants

Laser surface textures were made on the surfaces of WC/Co cemented carbide disks. Dry sliding friction and wear tests against titanium alloy balls were carried out with four kinds of samples for comparison. Results showed that the smooth surface burnished with solid lubricants cannot effectively improve the frictional performance of the cemented carbide, the textured surface without solid lubricants has a worse tribological behavior compared with the smooth surface, and only the surface texturing combined with solid lubricants shows the benefit in improving the tribological properties. The average friction coefficient and temperature of the textured surface filled with solid lubricants are both reduced compared with those of the smooth surface. Operation with textured surface filled with solid lubricants can also reduce the width of wear scars on the cemented carbide disks and wear loss of titanium alloy balls.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Action humidité, Humidity effect, Acción humedad, Air humide, Wet air, Aire húmedo, Air sec, Dry air, Aire seco, Alumine, Alumina, Alúmina, Analyse chimique, Chemical analysis, Análisis químico, Cavité, Cavity, Cavidad, Composition chimique, Chemical composition, Composición química, Céramique oxyde, Oxide ceramics, Cerámica óxido, Dureté superficielle, Surface hardness, Dureza superficial, Etat surface, Surface conditions, Estado superficie, Formation film, Film formation, Formación película, Humidité, Humidity, Humedad, Hydroxyde, Hydroxides, Hidróxido, Méthode temps vol, Time of flight method, Método tiempo vuelo, Particule usure, Wear particle, Partícula desgaste, Revêtement tribologique, Tribological coatings, Réaction tribochimique, Tribochemical reaction, Reacción triboquímica, Spectrométrie RX, X ray spectrometry, Espectrometría RX, Spectrométrie photoélectron, Photoelectron spectrometry, Espectrometría fotoelectrón, Topographie surface, Surface topography, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure, Wear, Desgaste, Nano hardness, and Tribofilm

A tribofilm is formed on alumina surfaces that have been slid against alumina surfaces. The tribofilm is formed by alumina wear particles that have been ground, agglomerated and tribosintered to a film. The tribofilm smoothens out the surface topography and fills up cavities. Tribofilms on alumina surfaces have been investigated with respect to surface appearance, hardness and chemical composition. Surface preparation and surrounding humidity have shown to affect the character and lateral distribution of the tribofilm. The tribofilm that was formed in humid air was softer than the tribofilm formed in dry air. XPS analysis revealed the chemical shift of the Al 2p peak did not differ between the tribofilms that was formed in different humidity, nor the unworn reference surface, finding that no hydroxide was found on the alumina surfaces. Also, no tribochemical changes could be detected by ToF-SIMS analysis.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Domaines classiques de la physique (y compris les applications), Fundamental areas of phenomenology (including applications), Mécanique des solides, Solid mechanics, Mécanique des structures et des milieux continus, Structural and continuum mechanics, Inélasticité (thermoplasticité, viscoplasticité...), Inelasticity (thermoplasticity, viscoplasticity...), Mécanique de la rupture (fissure, fatigue, endommagement...), Fracture mechanics (crack, fatigue, damage...), Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Alliage (action), Alloying, Aleación (acción), Alliage surface, Surface alloying, Aleación superficie, Aluminium alliage, Aluminium alloy, Aluminio aleación, Carbure de silicium, Silicon carbide, Silicio carburo, Composite matrice métallique, Metal matrix composite, Compuesto matriz metalico, Dureté, Hardness, Dureza, Fusion laser, Laser fusion, Fusión láser, Fusion surface, Surface melting, Fusión superficie, Laser, Láser, Microstructure, Microestructura, Norme ASTM, ASTM standard, Norma ASTM, Rectification superfine, Lapping, Rectificación superfina, Résistance abrasion, Abrasion resistance, Resistencia abrasión, Résistance usure, Wear resistance, Resistencia al desgaste, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Troisième corps, Third body, Tercer cuerpo, Usure abrasive, Abrasive wear, Desgaste abrasivo, Aluminium, Intermetallics, Laser surface alloying, Metal-matrix composites, and Three body-body abrasion

Laser surface alloying of aluminium AA1200 was performed with a 4 kW Nd:YAG laser to improve the abrasion wear resistance. Aluminium surfaces reinforced with metal matrix composites and intermetallic phases were achieved. The phases present depended on the composition of the alloying powder mixture. The wear performance of the alloyed surfaces was characterised using an ASTM G65 three body dry abrasion apparatus. A maximum 82% improvement in the wear resistance of the pure aluminium was achieved with a 40 wt% Ni + 20 wt% Ti +40 wt% SiC composition. The three alloys which had the best wear resistance were all produced with a composition of 40 wt% SiC and Ti and Ni powders ranging from 20 to 40 wt%. No direct correlation was observed between hardness and wear resistance. Microstructural examination showed that the main wear mechanisms were intense plastic deformation with micro-fracture of the SiC particles and intermetallic phases. The wear behaviour is mainly determined by the response of the different alloy phases, either independently or in combination, to the action of the abrasive particles and the precise nature of this response is complex and requires further study.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Metaux. Metallurgie, Metals. Metallurgy, Propriétés mécaniques. Rhéologie. Mécanique de la rupture. Tribologie, Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology, Frottement. Usure, Contact of materials. Friction. Wear, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Acier roulement, Ball bearing steel, Acero rodamiento de bolas, Kugellagerstahl, Carbone, Carbon, Carbono, Kohlenstoff, Dureté, Hardness, Dureza, Haerte, Effet surface, Surface effect, Efecto superficie, Oberflaecheneinfluss, Epaississement, Thickening, Espesamiento, Etat amorphe, Amorphous state, Estado amorfo, Amorpher Zustand, Etat surface, Surface conditions, Estado superficie, Oberflaechenzustand, Etude expérimentale, Experimental study, Estudio experimental, Experimentelle Untersuchung, Frottement, Friction, Frotamiento, Reibung, Fusion laser, Laser fusion, Fusión láser, Fusion surface, Surface melting, Fusión superficie, Oberflaechenschmelzen, Grenat, Garnet, Granate, Laser, Láser, Nitrure de silicium, Silicon nitride, Silicio nitruro, Siliciumnitrid, Porosité, Porosity, Porosidad, Porositaet, Texturation, Texturación, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Oberflaechenbehandlung, Tribologie, Tribology, Tribología, Amorphous carbon, Graphitization, Laser surface texturing, and Micro-tribology

In this paper, a kind of textured amorphous carbon film with the pattern of micro dots matrix was developed by irradiating amorphous carbon film with Nd-yttrium aluminum garnet laser system. Confirmed by the characterizations is that the produced micro dots are protuberant and in nanocrystalline graphite phase with a porous structure and reduced hardness. The micro tribological behavior of textured film was studied experimentally using steel balls and Si3N4 balls as the counter body. It turns out that the influences of laser treatment on the tribological performance of amorphous carbon film are strongly dependent on the friction pairs. By specially probing into the effects of localized micro graphite bulges, possible friction reduction mechanisms are discussed.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Alumine, Alumina, Alúmina, Coefficient frottement, Friction coefficient, Coeficiente roce, Céramique oxyde, Oxide ceramics, Cerámica óxido, Dimension particule, Particle size, Dimensión partícula, Essai bille sur disque, Ball on disk testing, Ensayo de resistencia de bola sobre disco, Essai usure, Wear test, Prueba al desgaste, Etude expérimentale, Experimental study, Estudio experimental, Formation film, Film formation, Formación película, Frottement, Friction, Frotamiento, Grenaillage, Shot peening, Granalla, Grosseur grain, Grain size, Grosor grano, Micromoteur, Micromotor, Moteur ultrason, Ultrasonic motors, Moteur électrique, Electric motor, Motor eléctrico, Mécanisme entraînement, Drive mechanism, Mecanismo accionamiento, Nanoindentation, Nanoindentacion, Nettoyage, Cleaning, Limpieza, Particule usure, Wear particle, Partícula desgaste, Revêtement tribologique, Tribological coatings, Réaction tribochimique, Tribochemical reaction, Reacción triboquímica, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Nano indentation, Tribofilm, and Wear

Ball-on-disc experiments have been performed in order to simulate the friction behaviour of, and tribofilm formation on the alumina friction drive system of an ultrasonic motor. The coefficient of friction between the counter surfaces of the friction drive system is important since the driving force of the motor is limited to the available maximum friction force. The experiments have been performed with alumina balls against alumina discs with different surface treatments and grain sizes. The tribofilm formation depends on the amount and size of particles generated during wear. Surface treatment by grit blasting contributes to the formation of more extensive and thicker tribofilm. The coefficient of friction showed to be substantially higher and more fluctuating with grit blasted surfaces than with the other types. There was no tribofilm formation on top of the ground surfaces, however the level of the coefficient of friction was about the same as on the as-sintered surfaces with tribofilm, irrespectively of grain size.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Adhérence, Adhesion, Adherencia, Azote, Nitrogen, Nitrógeno, Carbure de tungstène, Tungsten carbide, Wolframio carburo, Coefficient frottement, Friction coefficient, Coeficiente roce, Dureté, Hardness, Dureza, Essai bille sur disque, Ball on disk testing, Ensayo de resistencia de bola sobre disco, Essai frottement, Friction test, Prueba frotamiento, Essai usure, Wear test, Prueba al desgaste, Force adhérence, Adhesive strength, Fuerza adherencia, Frottement sec, Dry friction, Frotamiento seco, Implantation ion, Ion implantation, Implantación ión, Microscopie force atomique, Atomic force microscopy, Microscopía fuerza atómica, Microscopie électronique balayage, Scanning electron microscopy, Microscopía electrónica barrido, Microscopie électronique, Electron microscopy, Microscopía electrónica, Métrologie surface, Surface metrology, Metrología superficie, Nitrure d'aluminium, Aluminium nitride, Aluminio nitruro, Nitrure de silicium, Silicon nitride, Silicio nitruro, Nitrure de titane, Titanium nitride, Titanio nitruro, Profilométrie, Profilometry, Perfilometría, Pulvérisation cathodique, Cathodic sputtering, Pulverización catódica, Revêtement métallique, Metal coating, Revestimiento metálico, Revêtement tribologique, Tribological coatings, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure abrasive, Abrasive wear, Desgaste abrasivo, Usure adhésive, Adhesive wear, Desgaste adhesivo, Usure glissement, Sliding wear, Desgaste deslizamiento, PVD coatings, Sliding friction, and Solid lubricants

Ion implantation has found to be an effective approach to modify surface properties of materials. The present research investigates the effect of (1) nitrogen (N), and (2) carbon subsequently with nitrogen (C+N) implantations on the mechanical and tribological properties of the titanium-aluminium-silicon-nitride (Ti-Al-Si-N) coatings. Superhard TiAlSiN coatings produced by magnetron sputtering, of approximately 2.5 μm thickness, were post-treated by implantations of N or C+N at an energy level of 50keV. The dose range was between 5 × 1016 and 1 × 1018 ions cm―2. After implantation, the tribological performance of the coatings was investigated by a ball-on-disk tribometer against WC-6wt.%Co ball under dry condition in ambient air. The wear performance of the samples was examined by a variety of characterization techniques, such as secondary electron microscopy (SEM), 3D profilometry, atomic force microscopy (AFM), and micro-Raman. The results showed that the wear performance of the samples depended strongly on the implanted elements and doses. There was slight improvement on the samples implanted with N whereas significant improvement was found on the C + N implantations. Particularly, the friction coefficient of the sample with 5 × 1017 C+ cm―2 and 5 × 1017 N+ cm―2 could reach 0.1. In addition, the specific wear rate of the sample was extremely low (0.85 x 10―7 mm3/Nm), which was nearly two orders of magnitude below that of the un-implanted coating. The speculation of the mechanical and tribological analyses of the samples indicates that the improvement of the N implanted and C + N implanted TiAlSiN samples could be due to a combined effect of improved hardness, plus enhanced adhesive and cohesive strength. In addition, the improved performance of the C + N implanted samples could be explained by the formation of lubricating implanted-layer, which existed mostly in sp2 C-C and C-N forms. The formation of such implanted layer could lead to a change of wear mode from strong abrasive wear to mostly adhesive wear, and result in a drop of friction coefficient and wear rate.

Chemical engineering, Génie chimique, Mechanical engineering, Génie mécanique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Etat condense: structure, proprietes mecaniques et thermiques, Condensed matter: structure, mechanical and thermal properties, Surfaces et interfaces; couches minces et trichites (structure et propriétés non électroniques), Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties), Propriétés physiques non électroniques de couches minces, Physical properties of thin films, nonelectronic, Propriétés mécaniques et acoustiques, Mechanical and acoustical properties, Sciences appliquees, Applied sciences, Genie mecanique. Construction mecanique, Mechanical engineering. Machine design, Métrologie industrielle. Contrôle, Industrial metrology. Testing, Généralités, General, Organes de machines, Machine components, Frottement, usure, lubrification, Friction, wear, lubrication, Acier outil, Tool steel, Acero herramienta, Adhérence, Adhesion, Adherencia, Contrainte résiduelle, Residual stress, Tensión residual, Couche mince, Thin film, Capa fina, Cuivre, Copper, Cobre, Dureté, Hardness, Dureza, Essai bille sur disque, Ball on disk testing, Ensayo de resistencia de bola sobre disco, Essai rayage, Scratching test, Ensayo al rayado, Essai usure, Wear test, Prueba al desgaste, Etude expérimentale, Experimental study, Estudio experimental, Force adhérence, Adhesive strength, Fuerza adherencia, Frottement, Friction, Frotamiento, Haute fréquence, High frequency, Alta frecuencia, Machine mouvement alternatif, Reciprocating movement machine, Máquina movimiento alterno, Microcapteur, Microsensor, Microcaptador, Molybdène alliage, Molybdenum alloy, Molibdeno aleación, Relation structure propriété, Property structure relationship, Relación estructura propiedad, Revêtement composite, Composite coating, Revestimiento compuesto, Revêtement céramique, Ceramic coating, Revestimiento cerámico, Résistance usure, Wear resistance, Resistencia al desgaste, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Usure, Wear, Desgaste, Vitesse usure, Wear rate, Velocidad desgaste, Propriété substrat, Substrate property, Propriedad substrato, Adhesion energy, and Molybdenum nitride

Ceramic thin film coatings, such as MoN/Cu, are attractive for engine applications due to their low friction, high hardness and high wear resistance. However, there is a need to establish a reliable connection between the deposition parameters of the thin film and its tribological performance. In this study, two coating compositions, MoN and MoN with Cu were deposited on H-13 tool steel substrates in order to correlate compositional variables that result from processing to their respective tribological properties. The efficacy of the coating in protecting surfaces is highly dependent on its adhesion to the substrate and its tribological properties. Residual stresses resulting from the coating deposition were evaluated using an X-ray microprobe. Scratch testing was performed to measure the coating adhesion energy, and the wear rate was determined using a ball-on-flat contact configuration on a high frequency reciprocating test rig. It was observed that coatings with lower copper content performed better in the wear test and exhibited higher coating adhesion energy. A primary wear damage mechanism was coating removal by delamination and spallation, which is related to the adhesion energy. Since coating processing variables determine the structure and properties, and hence affect the tribological properties of these MoN based coatings, these parameters can be used to optimize coating composition for enhanced tribological performance.