Process for the production of sintering-active Si.sub.3 N.sub.4

Details Process for the production of sintering-active Si.sub.3 N.sub.4 Process for the production of sintering-active Si.sub.3 N.sub.4

1992-12-21

1993-11-30

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

423344, C04B 3558

Patent

active

052665356

ABSTRACT:
A process is disclosed for producing sintering active silicon nitride powders with low oxygen content by wet grinding a silicon nitride starting material, leaching the ground suspension with fluorine-free mineral acid, and separating off the purified silicon nitride powder.

REFERENCES:
patent: 4980322 (1990-12-01), Wickel et al.
patent: 4983371 (1991-01-01), Pitzer et al.
patent: 5126295 (1992-06-01), Uchino et al.
B. Hoffmann, Keramische, 40:90-92 (1988).
R. K. Iler, Chemistry of Silica, John Wiley & Sons, p. 40 (1979).
Ziegler et al., J. Mat. Sci. 22:3041-86 (1987).
DIN 66131, Oct. 1973.
DIN 66131, Nov. 1991.

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