INJECTION-MOLDING OF SILICON-CARBIDE USING AN ORGANIC VEHICLE BASED ON A PRECERAMIC POLYMER

Large ceramic injection mouldings were prepared using a SiC compositio n,vith polycarbosilane and paraffin wax. The material sustained mixing and injection moulding at temperatures up to 230 degrees C. Conventio nal, modulated pressure and heated sprue techniques were used to produ ce large sections, some of which were subsequently pyrolysed and sinte red. Fired relative densities of 97% were obtained under conditions wh ere the dry compacted powder sintered to 90%.