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

1990-11-27

1992-05-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 264 65, C04B 3558

Patent

active

051148897

ABSTRACT:
Disclosed is a silicon nitride sintered body comprising 70 to 99 mole % of silicon nitride, 0.1 to 5 moles % of a rare earth element oxide and up to 25 moles % of silicon oxide and having a silicon oxide-to-rare earth element oxide molar ratio of from 2 to 25, wherein silicon nitride crystal grains have a fine acicular structure having an average particle major axis of up to 7 .mu.m and an average aspect ratio of at least 3.

REFERENCES:
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patent: 4383958 (1983-05-01), Moschetti et al.
patent: 4401768 (1983-08-01), Morgan
patent: 4449989 (1984-05-01), Sarin et al.
patent: 4455275 (1984-06-01), Alderhorn et al.
patent: 4457958 (1984-07-01), Lange et al.
patent: 4652276 (1987-03-01), Burden
patent: 4870036 (1989-09-01), Yeh

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