SI3N4 process using polysilane or polysilazane as a binder

Details SI3N4 process using polysilane or polysilazane as a binder SI3N4 process using polysilane or polysilazane as a binder

1988-10-31

1992-01-14

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 97, C04B 3332

Patent

active

050808443

ABSTRACT:
A process for making a densified silicon nitride article utilizing polysilanes or polysilazanes as a binder is described. The process involves blending of a silicon nitride composition with a polysilane or a polysilazane to form a mixture. The mixture is molded into an article. The article is then pyrolyzed in a non-oxidizing atmosphere and at a temperature sufficient to form a pyrolyzed article comprising amorphous silicon nitride and silicon carbide. The article is then sintered at a temperature equal to or greater than 1400.degree. C. to form a densified silicon nitride article.

REFERENCES:
patent: 3892583 (1975-07-01), Winter
patent: 4543344 (1985-09-01), Cannady
patent: 4689252 (1987-08-01), Lebrun
patent: 4704242 (1987-11-01), Bandyopadhyay
patent: 4800182 (1989-01-01), Izaki et al.
Schwartz et al., Microstructural Development in Si.sub.3 N.sub.4 /Polysilazane Bodies During Heating, Presented to ACS 5/4/87.

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