Sumitomo Aluminium Smelting Company, Ltd.

Sumitomo Aluminum Smelting Company, Limited

Yoshisaburo Nomura

Koichi Yamada

Masahide Mouri

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.

Sintered silicon carbide articles

The present invention relates to a method for manufacturing a high-strength sintered silicon carbide article and more particularly, to a method for a sintered silicon carbide article having high mechanical strength by mixing a finely divided silicon carbide powder with the definite amounts of a specific carbon-containing material, a boron compound and silicon powder as densification aids, shaping and then sintering said shaped article under an inert atmosphere.

Growing community of inventors

Uma, Japan

Yoshisaburo Nomura