Preceramic compositions and ceramic products.

摘要

Preceramic molding compositions capable of forming low density ceramics having acceptable strength and improved wear resistance are compositions having a particle size not larger than about 105 micrometers and comprising an intimate mixture of (A) 50-90 parts by weight of powder ingredients comprising 2-50% by weight of graphite powder and 98-50% by weight of a second powder selected from silicon carbide, silicon nitride, and mixtures thereof and (B) correspondingly, 50-10 parts by weight of a preceramic polysilazane binder.