Tough Si.sub.3 N.sub.4 composite ceramics

Details Tough Si.sub.3 N.sub.4 composite ceramics Tough Si.sub.3 N.sub.4 composite ceramics

1985-08-30

1986-06-24

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 60, 264 66, 264125, 501 97, 501 98, C04B 3502, C04B 3558

Patent

active

045967814

ABSTRACT:
A tough Si.sub.3 N.sub.4 ceramic composite is provided by incorporating a ternary oxide additive containing hafnia, titania and zirconia. The ternary oxide additive consists essentially of 60 to 85 mole percent hafnia, 10 to 30 mole percent titania and 10 to 30 mole percent zirconia, and is added to the Si.sub.3 N.sub.4 in a proportion ranging from about 10 to about 50%, by volume of ternary oxide additive, based on the overall composition. The ceramic composites are prepared by providing a mixture of the Si.sub.3 N.sub.4 and the ternary oxide additive, forming the mixture into a predetermined shape, e.g. by cold pressing, and sintering the shape at an appropriate temperature, to solidify and densify the shape.

REFERENCES:
patent: 3657063 (1972-04-01), Brown et al.
patent: 4298385 (1981-11-01), Claussen et al.
patent: 4376652 (1983-03-01), Buljan
patent: 4421528 (1983-12-01), Buljan et al.
patent: 4506024 (1985-03-01), Claussen et al.

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