Silicon nitride base sintered body

Details Silicon nitride base sintered body Silicon nitride base sintered body

1991-05-15

1995-05-02

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 95, 501 98, 51307, C09B 3558

Patent

active

054119235

ABSTRACT:
A silicon nitride body having a surface portion comprising .alpha. sialon, or .alpha. sialon and .beta. sialon wherein the ratio of .alpha. sialon relative to the sum of .alpha. sialon and .beta. sialon is at least 0.6; and an inner portion comprising .beta. sialon, or .alpha. sialon and .beta. sialon, wherein the ratio of .beta. sialon relative to the sum of .alpha. sialon and .beta. sialon is at least 0.6.

REFERENCES:
patent: 4818635 (1989-04-01), Ekstrom et al.
patent: 4880755 (1989-11-01), Mehrotra et al.

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