Silicon nitride sintered body and process for preparation thereo

Details Silicon nitride sintered body and process for preparation thereo Silicon nitride sintered body and process for preparation thereo

1988-04-01

1990-04-24

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 3558

Patent

active

049200852

ABSTRACT:
Disclosed is a silicon nitride sintered body comprising 85 to 99 mol % of .beta.-Si.sub.3 N.sub.4, 1 to 5 mol % as the oxide (M.sub.2 O.sub.3) of at least one compound of an element (M) selected from the group consisting of Sc, Vb, Er, Ho and Dy and less than 10 mol % of excessive oxygen (O.sub.2) based on the three components, wherein the excessive oxygen/M.sub.2 O.sub.3 molar ratio is lower than 2.

REFERENCES:
patent: 4412009 (1983-10-01), Komatsu et al.
patent: 4499192 (1985-02-01), Shimamori et al.
patent: 4716133 (1987-12-01), Horiuchi et al.

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