High-packing silicon nitride powder and method for making

Details High-packing silicon nitride powder and method for making High-packing silicon nitride powder and method for making

1993-11-10

1995-01-17

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501 96, 264 65, 423353, C04B 3558

Patent

active

053825543

ABSTRACT:
High-packing silicon nitride powder having a tap density of at least about 0.9 g/cm.sup.3 is prepared by reacting a metallic silicon powder having a mean particle size of about 1 to 10 .mu.m, a BET specific surface area of about 1 to 5 m.sup.2 /g, and a purity of at least about 99% with nitrogen in a nitrogen atmosphere containing about 5 to 20% by volume of hydrogen at about 1,350 to 1,450.degree. C., and milling the resulting silicon nitride powder in a dry attritor. The powder is moldable into a compact having a density of at least about 1.70 g/cm.sup.3, from which a sintered part having improved dimensional precision and strength is obtained.

REFERENCES:
patent: 4440707 (1984-04-01), Shimamori et al.
patent: 4517168 (1985-05-01), Kawahito et al.
patent: 4521358 (1985-06-01), Miura et al.
patent: 4716133 (1987-12-01), Horiuchi et al.
patent: 4923829 (1990-05-01), Yasutomi et al.

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