Pellet-based Fused Deposition Modeling of polycarbosilanes towards on-demand 3D silicon carbide-based objects
CHEYPE M. 1, ROSSIGNOL F. 1, PATELOUP V. 1, BERNARD S. 1
1 Institute of Research for Ceramics, Limoges, France
There is a trend toward more performant or competitive materials with the objective to improve the efficiency of actual systems and to repel technological boundaries. Carbides can be considered as such strategic materials. They attract increasing interest due to their properties targeted for future materials and technologies especially in aerospace. Inherent difficulties to the traditional techniques for manufacturing such dense materials with a complex geometry can be overcome by the development of new manufacturing approaches on the first hand, and the deployment of synthetic paths where chemistry of materials and ceramic science are combined rationally to process multi-scale complex solid state architectures. This second part can be investigated by the Polymer-Derived Ceramics (PDCs) route, which offers new opportunities in ceramic sciences. The molecular origin of preformed preceramic polymers such as polycarbosilanes and the possibility of modifying them to be then shaped and transformed into advanced ceramics such as silicon carbide (SiC) play a major role in the elaboration of ceramics endowed with properties that reach far beyond those of existing materials. Here, the aim of this work is to modify SiC precursors to fit in Fused Deposition Modeling technology and design SiC-based components with complex shapes at relatively low temperature. The chemistry behind the synthesis and pyrolysis behaviour of these polymers as well as their processability will be presented and discussed. The characterization of the materials will be done at each step of their elaboration process.