High strength, low mass porous silicon nitride based articles

Details High strength, low mass porous silicon nitride based articles High strength, low mass porous silicon nitride based articles

1986-01-21

1986-12-16

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

252 122, 501 98, 501152, C04B 3558

Patent

active

046297073

ABSTRACT:
An article is disclosed which is made of silicon nitride based material consisting essentially of in percent by weight about 6% yttrium oxide and the balance silicon nitride. The article has open porosity of from about 37% by volume at which level the strength of the article is about 15 ksi to about 10% by volume open porosity at which level the strength of the article is about 72 ksi.
The article can have within its open porosity a lubricating material.

REFERENCES:
patent: 3827892 (1974-08-01), McCauley
patent: 4280850 (1981-07-01), Smith et al.
patent: 4356136 (1982-10-01), Mangels
patent: 4455275 (1984-06-01), Alderborn et al.

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