Method for producing ceramic sintered body of a Si.sub.3 N.sub.4

Details Method for producing ceramic sintered body of a Si.sub.3 N.sub.4 Method for producing ceramic sintered body of a Si.sub.3 N.sub.4

1985-02-07

1986-02-25

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 82, 423344, 501 92, C04B 3558

Patent

active

045729026

ABSTRACT:
After sintering, ceramic body of Si.sub.3 N.sub.4 -SiC is heat-treated at 500.degree.-1500.degree. C. in atmosphere of gas mixture of chlorine and nitrogen whereby SiC is converted into silicon chloride which in turn is nitrided to form Si.sub.3 N.sub.4 in the pores of the ceramic body to provide closed pore structure. Gas mixture may contain oxygen. Heat treatment may be conducted in pressurized atmosphere of gas mixture.

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