Impregnating porous carbon body with refractory material - esp. carbide, boride and/or nitride to improve compressive strength and erosion resistance

摘要

A carbonised body opt. partly densified by vapour deposition of carbon, is further densified with refractory materials other than carbon by infiltration. Specific refractories are carbides of Si, B and the transition elements, nitrides of Si and B, metallic silicides and transition metal diborides, the infiltration is effected in depth by chemical vapour deposition. The body produced has higher mechanical strength in tension and in compression and is more resistant to erosion and to chemical attack esp. by molten alkali metals.