Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1988-11-07
1990-10-09
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 88, 501 91, 501 92, 10628713, C04B 3552
Patent
active
049620690
ABSTRACT:
The preparation of highly densified ceramic bodies by the sintering of certain preceramic polysilazanes filled with silicon carbide powders, metal-containing sintering aids, and, optionally, polysilazane curing agents 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 handled and, if desired, machined before sintering. The preceramic polysilazanes useful in this invention must yield ceramic chars 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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Burns Gary T.
Keller Ronald J.
Saha Chandan K.
Dixon Jr. William R.
Dow Corning Corporation
Gallo Chris
Gobrogge Roger E.
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