Substantially pore-free shaped articles of polycrystalline silic

Details Substantially pore-free shaped articles of polycrystalline silic Substantially pore-free shaped articles of polycrystalline silic

1984-09-07

1985-12-24

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 97, 264 63, 264 65, C04B 3556, C04B 3558

Patent

active

045606684

ABSTRACT:
The invention is substantially pore-free shaped articles consisting essentially of polycrystalline silicon nitride and polycrystalline silicon carbide in the form of a homogeneous microstructure having grain sizes of not more than 10 .mu.m manufactured from mixtures of Si.sub.3 N.sub.4 powder and SiC powder in a weight ratio of from 5:95 to 95:5 without the concomitant use of sintering aids by isostatic hot pressing in a vacuum-sealed casing at temperatures of from 1800.degree. to 2200.degree. C. and a pressure of from 100 to 400 MPa.

REFERENCES:
patent: 3890250 (1975-06-01), Richerson
patent: 3895219 (1975-07-01), Richerson et al.
patent: 3974106 (1976-08-01), Richerson
patent: 4184882 (1980-01-01), Lange
patent: 4187116 (1980-02-01), Lange
patent: 4381931 (1983-05-01), Hunold et al.
American Ceramic Society Bulletin, vol. 60 (1981), Nov., No. 11, T. Yamada et al., pp. 1225-1228.

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