Sintered silicon nitride body

Details Sintered silicon nitride body Sintered silicon nitride body

1985-03-05

1986-12-09

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 60, 501 98, 501152, C04B 3558

Patent

active

046280391

ABSTRACT:
Disclosed is a sintered ceramic body having a composition comprising (i) Si.sub.3 N.sub.4, (ii) a combination of an oxide of an element of the group IIIa of the Periodic Table having an ionic radius smaller than 0.97 .ANG. and an oxide of other element of the group IIIa of the Periodic Table, having an ionic radius larger than 0.97.degree. and (iii) an oxide or nitride of at least one of the following: (1) at least one element of group IIa of the Periodic Table; (2) Al; (3) Ti; (4) Cr; (5) Ga; (6) Zr; and (7) Si. This sintered silicon nitride body shows a high oxidation resistance when it is used for a long time at high temperatures, and the sintered body is excellent in the creep characteristics and flexural strength at high temperatures.

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patent: 4234343 (1980-11-01), Andersson
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patent: 4506021 (1985-03-01), Jack et al.
patent: 4511402 (1985-04-01), Miura et al.
CRC Handbook of Chemistry and Physics, 61st ed. 1980-1981, (pp. F216-217 showing radius in .ANG. of elements).

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