Sinterable SI.sub.3 N.sub.4 powders containing sintering additiv

Details Sinterable SI.sub.3 N.sub.4 powders containing sintering additiv Sinterable SI.sub.3 N.sub.4 powders containing sintering additiv

1989-07-10

1990-12-25

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 423406, C04B 3558

Patent

active

049803220

ABSTRACT:
Sinterable Si.sub.3 N.sub.4 powder containing Si.sub.3 N.sub.4 particles and sintering additives wherein Si.sub.3 N.sub.4 particles have an average particle size of less than 1 .mu.m, contain no particle having a diameter greater than 100 .mu.m, have a total content of metallic impurities less than 1000 ppm and an iron content of less than 200 ppm, and wherein the sintering additives are uniformly distributed throughout the powder is prepared by co-grinding pulverulent sintering additive and Si.sub.3 N.sub.4 containing less than 1000 ppm metallic impurities in a spiral jet mill.

REFERENCES:
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4124402 (1978-11-01), Greskovich et al.
patent: 4511525 (1985-04-01), Tsuge et al.
patent: 4845060 (1989-07-01), Wickel et al.
Science of Ceramic Chemical Processing, ed. by Hench and Ulrich, Wiley, N.Y., 1986, p. 539ff.
Chemical Abstracts, 99:109670p (1983).

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