Method of producing dense sintered silicon carbide body from pol

Details Method of producing dense sintered silicon carbide body from pol Method of producing dense sintered silicon carbide body from pol

1978-01-27

1983-02-22

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 264332, 501 88, C04B 3558

Patent

active

043747930

ABSTRACT:
A method of producing a dense sintered silicon carbide body, which is high in flexural strength, purity and strength at an elevated temperature, from polycarbosilanes is disclosed. This method comprises the following steps of:
A. polymerizing organosilicon compounds to obtain insoluble and unmeltable polycarbosilane of which the melting or softening temperature lies higher than its thermal decomposition temperature;
B. grinding this insoluble and unmeltable polycarbosilane to powder;
C. decomposing this powder thermally in the range of 600.degree. to 2200.degree. C. in a nonoxidizing atmosphere to obtain silicon carbide;
D. molding this silicon carbide powder; and
E. sintering the thus molded body in a nonoxidizing atmosphere.

REFERENCES:
patent: 3809565 (1974-05-01), Wewerka et al.
patent: 4080415 (1978-03-01), Coppola et al.
Yojima et al., "SiC Bodies Sintered with Three Dimensional Cross Linked Polycarbosilane", Cir. Bull, vol. 56, No. 12 (1977)-pp. 1060-1063.
Yojima et al., "Pyrolysis of a Polyborodiphenylsiloxane", Nature, No. 5602, 4-7-77, pp. 521-522.

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