Process for the synthesis of silicon nitride

Details Process for the synthesis of silicon nitride Process for the synthesis of silicon nitride

1984-12-24

1986-10-28

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

423344, C04B 3558

Patent

active

046199055

ABSTRACT:
A process for the preparation of silicon nitride powders, which are suitable for the manufacture of high quality structural ceramics is described. The synthesis process is based on the reduction of silicon dioxide by carbon in a nitrogen stream at elevated temperatures to form alpha silicon nitride. Silicon nitride powders of various morphologies are obtained by this technique by varying either the type of reactants used or the process conditions. Structural ceramics with densities exceeding 99% of theoretical and having satisfactory mechanical strength and oxidation resistance were sintered from powders synthesized by the method of this invention.

REFERENCES:
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4122152 (1978-10-01), Mori et al.
patent: 4280850 (1981-07-01), Smith et al.
patent: 4425141 (1984-01-01), Buljan et al.
patent: 4514370 (1985-04-01), Inoue et al.

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