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

US5643843A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Stephen D. Dunmead · Midland, US
• Alan W. Weimer · Niwot, US
• Daniel F. Carroll · Midland, US
• Glenn A. Eisman · Midland, US
• Gene A. Cochran · Midland, US
• David W. Susnitzky · Midland, US
• Donald R. Beaman · Midland, US
• Kevin J. Nilsen · Midland, US

Key dates

• Filing date: Jul 12, 1996
• Grant date: Jul 1, 1997
• Expiry date: Jul 12, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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.