Sintered silicon carbide articles

Details Sintered silicon carbide articles Sintered silicon carbide articles

1990-02-07

1991-02-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

C04B 3556

Patent

active

049944177

ABSTRACT:
The invention relates to a method for producing a sintered silicon carbide article having a sintered density of at least 90% of the theoretical density and a mechanical flexural strength of 50 kg/mm.sup.2 or higher. This is achieved by adding to a finely divided .alpha.-type silicon carbide powder, a tar pitch in such amounts as to provide 4.2-6 parts by weight of carbon after carbonization and a boron compound such as to correspond to a boron content of 0.005-0.15 parts by weight as densification aids, mixing and shaping the resulting mixture, and then sintering the thus-shaped article in an inert atmosphere at a temperature of from 1950 .degree. to 2300.degree. C.

REFERENCES:
patent: Re30286 (1980-05-01), Coppole et al.
patent: 4312954 (1982-01-01), Coppola et al.
patent: 4372902 (1983-02-01), Denton et al.

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