Silicon nitride sintered body and method for producing same

Details Silicon nitride sintered body and method for producing same Silicon nitride sintered body and method for producing same

1987-04-30

1989-02-21

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 3558

Patent

active

048065102

ABSTRACT:
There is obtained, by mixing oxide raw material powders, compacting the mixture and sintering the compact, a silicon nitride sintered body mainly composed of silicon nitride and having a grain boundary phase wherein crystals represented by Yb.sub.2 Si.sub.2 O.sub.7 and a Zr.sub.3 Yb.sub.4 O.sub.12 are present in the grain boundary phase and molar ratio ZrO.sub.2 /Yb.sub.2 O.sub.3 in terms of ZrO.sub.2 and Yb.sub.2 O.sub.3 is 2/98 to 75/25 and the total amount of ZrO.sub.2 and Yb.sub.2 O.sub.3 is 1-40% by weight of the sintered body.

REFERENCES:
patent: 4234343 (1980-11-01), Andersson et al.
patent: 4351787 (1982-09-01), Martinengo et al.
patent: 4511402 (1985-04-01), Miura et al.
patent: 4650498 (1987-03-01), Buljan
patent: 4652276 (1987-03-01), Burden
Chemical Abstracts, "Silicon Nitride Sintered Body With High Strength and Improved Oxidation Resistance", Yokoyama, vol. 106 No. 20, Abstract No. 161431p, May 18, 1987, p. 324.
Journal of the American Ceramic Society, Mieskowski et al, "Oxxidation of Silicon Nitride Sintered With Rare-Earth Oxide Additions", vol. 68, No. 7, Jul. 1985, pp. C-160-C-163.

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