Production of whisker-free Si.sub.3 N.sub.4 particulates by carb

Details Production of whisker-free Si.sub.3 N.sub.4 particulates by carb Production of whisker-free Si.sub.3 N.sub.4 particulates by carb

1992-07-02

1995-01-03

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

423344, C04B 3558, C01B 21068

Patent

active

053786661

ABSTRACT:
Whisker-free particulates of silicon nitride (Si.sub.3 N.sub.4), e.g., spheres, beads, or a variety of other shaped articles exhibiting a regular and controlled particle size, are produced by incorporating a primary reaction mixture of silica and carbon into a porous, carbon-based matrix material, next carbonitriding the composite thus formed, and characteristically eliminating excess carbon from the carbonitrided composite.

REFERENCES:
patent: 4428916 (1984-01-01), Komeya et al.
patent: 4514370 (1985-04-01), Inoue et al.
patent: 4986972 (1991-01-01), Ishii et al.
patent: 5075091 (1991-12-01), Schonfelder et al.

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