Sintered silicon nitride and method for making the same

Details Sintered silicon nitride and method for making the same Sintered silicon nitride and method for making the same

1990-03-14

1991-06-25

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 87, 501 88, 501 92, 501 95, 501 97, 501 98, C04B 3552, C04B 3558, C04B 3502, C04B 3508

Patent

active

050266713

ABSTRACT:
A sintered silicon nitride contains at least 90% of .beta.-type silicon nitride, wherein said .beta.-type silicon nitride consists essentially of 35 to 80% of large crystal particles with the remainder of small crystal particles, said large crystal particles having a mean particle length being at least two times as long as that of said small crystal particles. This sintered silicon nitride is obtained by a method wherein one batch of starting silicon nitride powders, whose primary particles have a mean particle size of 0.1 to 0.5 .mu.m, and another batch of starting silicon nitride powders, whose primary particles have a mean particle size of 0.5 to 0.7 .mu.m, are blended with a sintering aid or aids at a given weight ratio, and the thus obtained blend is formed or compacted and sintered.

REFERENCES:
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4225356 (1980-09-01), Prochazka et al.
patent: 4365022 (1982-12-01), Tabata et al.
World Patent Index No. 88-067519 dated Oct. 1988.
European Search Report.

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