Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1986-03-07
1987-05-26
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 92, C04B 3556, C04B 3558
Patent
active
046686428
ABSTRACT:
A method is disclosed for increasing the ceramic yield of a ceramic material obtained by firing a R.sub.3 SiNH-containing silazane polymer to an elevated temperature in an inert atmosphere or in a vacuum. The method involves adding certain boron compounds to the R.sub.3 SiNH-containing silazane polymer prior to firing. Suitable boron compounds include, among others, metaboric acid, orthoboric acid, and organoboron compounds of the general formula BR.sub.3 " where R" is selected from the group consisting of alkyl radicals containing 1 to 5 carbon atoms, phenyl radicals, and --OR'" radicals where R'" is an alkyl radical containing 1 to 4 carbon atoms.
REFERENCES:
patent: 4312970 (1982-01-01), Gaul
patent: 4340619 (1982-07-01), Gaul
patent: 4540803 (1985-09-01), Cannady
Eaborn, C., "Organosilicon Compounds," Butterworth Scientific Pub., London, 1960, p. 1.
Bell Mark L.
Dow Corning Corporation
McKellar Robert L.
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