SILICON CARBIDE CERAMICE

摘要

1438709 Silicon carbide ceramics GENERAL ELECTRIC CO 18 Dec 1973 [21 Dec 1972] 58585/73 Heading C7D [Also in Division C1] A dense fine-grained SiC ceramic comprises # SiC and an additive consisting of B or B4C (the additive equivalent to 0À5-3À0 parts by wt. B to 100 parts SiC) having a density of at least 98% of the theoretical density. The ceramic is formed by hot pressing a homogeneous dispersion of submicron powders of SiC and B or B 4 C in an inert atmosphere at 1900‹-2000‹C and 5,000-10,000 psi. The inert gas is Ar, He, or N2