High-hardness sintered article and method for manufacture thereo

Details High-hardness sintered article and method for manufacture thereo High-hardness sintered article and method for manufacture thereo

1986-02-28

1988-11-29

Capella, Steven

Compositions: ceramic

Ceramic compositions

Refractory

51307, 75234, 75249, C04B 3558

Patent

active

047881666

ABSTRACT:
A high-hardness sintered article having high-pressure phase boron nitride as its matrix is manufactured by preparing a mixture consisting of 65 to 95% by volume of a high-pressure phase boron nitride formed of boron nitride of cubic phase having a continuous grain size distribution ranging fom a maximum grain size of 10 to 50 .mu.m to a minumum grain size of less than 1 .mu.m and optionally admixed with wurtzite type boron nitride, 4 to 34% by volume of carbide, nitride or carbonitride of titanim alone or in conjunction with carbide, nitride, or carbonitride of tantalum, and the balance to make up 100% by volume of aluminum and sintering the mixture at a temperature of at least 1,200.degree. C. under pressure of at least 20,000 atmospheres. A high-hardness sintered article is obtained without entailing any loss of hardness during the course of sintering by additionally incorporating in the mixture as 100% 0.1 to 5% by volume of boron and treating the resulting mixture under entirely the same conditions as described above.

REFERENCES:
patent: 4334928 (1982-06-01), Hara et al.
patent: 4343651 (1982-08-01), Yazu et al.
patent: 4566905 (1986-01-01), Akashi et al.
Modern Ceramic Engineering, D. W. Richerson (1982), pp. 220-223.

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