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

1989-12-06

1993-06-15

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 97, 501 98, C04B 3565

Patent

active

052195007

ABSTRACT:
Disclosed is a silicon nitride sintered body comprising 85 to 99 mole % of .beta.-Si.sub.3 N.sub.4, 1 to 5 mole % 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 mole % 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: 4351787 (1982-09-01), Martinengo et al.
patent: 4795724 (1989-01-01), Soma et al.

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