Ortona, Alberto, D'Angelo, Claudio, Gianella, Sandro, and Gaia, Daniele
Materials letters, 2012 Aug. 1, v. 80, p. 95-98.
manufacturing, foaming, microstructure, ceramics, cell structures, silicon, polymers, and methodology
Rapid prototyping techniques such as stereolithography and selective laser curing have been utilized to produce preceramic articles to be further pyrolyzed and infiltrated with molten silicon. Recently they were also used for near to net shape cellular Si–SiC manufacturing. In this study we propose a hybrid methodology that can realize cellular ceramic structures of any shape by combining 3D printing of polymer inks with replication. This hybrid method overcomes the surface finish limitations of the current RP techniques by manufacturing cellular structures with a fine microstructure and an engineered cavity. RP structures showed higher compression strengths then foams both produced with the same replication technique.
Materials letters, 2011 Oct., v. 65, no. 19-20, p. 2947-2950.
zinc, manufacturing, metallurgy, copper sulfate, and porosity
New approach for manufacturing metallic cellular materials with controlled open pore geometry and cells arrangement is presented. The method is based on the combination of rapid prototyping of a template with powder metallurgy. Modification of the procedure allows for additional introduction of closed-type porosity with pores smaller than those defined by the rapid prototyped template. The accuracy of the method for controlling the size, shape and arrangement of open-type pores is presented on the example of zinc with an inorganic template (CuSO₄). The same materials are used to produce a structure with two types of porosities combined in one structure, regular opened and irregular closed. The control of pore geometry allows for optimization of metallic cellular materials for their mechanical, chemical and biological applications.