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Silicon nitride/silicon carbide composite densified materials prepared using composite powders

United States Patent

*** EXPIRED ***
July 1, 1997
View the Complete Patent at the US Patent & Trademark Office
Prepare silicon nitride-silicon carbide composite powders by carbothermal reduction of crystalline silica powder, carbon powder and, optionally, crystalline silicon nitride powder. The crystalline silicon carbide portion of the composite powders has a mean number diameter less than about 700 nanometers and contains nitrogen. The composite powders may be used to prepare sintered ceramic bodies and self-reinforced silicon nitride ceramic bodies.
Dunmead; Stephen D. (Midland, MI), Weimer; Alan W. (Midland, MI), Carroll; Daniel F. (Midland, MI), Eisman; Glenn A. (Midland, MI), Cochran; Gene A. (Midland, MI), Susnitzky; David W. (Midland, MI), Beaman; Donald R. (Midland, MI), Nilsen; Kevin J. (Midland, MI)
The Dow Chemical Company (Midland, MI)
08/ 678,199
July 12, 1996
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of contract Number 86X-SK761C awarded by the Department of Energy.