Highly densified bodies from organopolysiloxanes filled with sil

Details Highly densified bodies from organopolysiloxanes filled with sil Highly densified bodies from organopolysiloxanes filled with sil

1988-09-26

1990-05-29

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 88, 501 89, C04B 3552

Patent

active

049295730

ABSTRACT:
The preparation of highly densified ceramic bodies by the sintering of certain organopolysiloxanes filled with silicon carbide powders, and metal-containing sintering aids is described. Such highly densified ceramic bodies can be prepared by either a pressureless sintering process or a hot press sintering process. The compositions of this invention can be formed into desired shapes and then sintered to form ceramic, shaped bodies with high densities. One advantage of the present invention is that the green bodies have relative high strengths and thus can be easily handles and, if desired, machined before sintered. The organopolysiloxanes useful in this invention must yield a ceramic char which contains free or excess carbon in addition to carbon in the form of silicon carbide upon pyrolysis to elevated temperatures.

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patent: 4269757 (1981-05-01), Mine et al.
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Yajima et al.; "Pyrolysis of a Polyborodiphenylsiloxane", 266 Nature 521, (1977).
Yajima et al.; "SiC and Si.sub.3 N.sub.4 Sintered Bodies with New Borodiphenylsiloxane Polymers as Binder," 266 Nature 522, (1977).

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