Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1987-02-24
1988-08-09
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 90, 501 91, 501 92, C04B 3556
Patent
active
047628103
ABSTRACT:
Sintered bodies of silicon carbide having remarkably increased volume resistivity and thermal conductivity can be obtained by heating a green body shaped of a fine silicon carbide powder admixed with boron or a boron compound, e.g. boron carbide, titanium boride and boron oxide, as a sintering aid at 1800.degree. to 2200.degree. C. in the presence of or in the vicinity of a shaped body of a powdery mixture of a fine silicon carbide powder admixed with boron nitride in the same furnace. The improvements in the volume resistivity and thermal conductivity of the sintered body are particularly remarkable when the fine silicon carbide powder is a pyrolysis product of a methyl hydrogen silane compound such as tetramethyl disilane.
REFERENCES:
patent: 4179299 (1979-12-01), Coppola et al.
patent: 4209474 (1980-06-01), Prochazka
patent: 4649002 (1987-03-01), Kim et al.
Endo Morinobu
Hayashida Akira
Hongu Tatsuhiko
Ohsaki Hiromi
Takamizawa Minoru
Dixon Jr. William R.
Green Anthony
Shin-Etsu Chemical Co. , Ltd.
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