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Title: Silicon nitride/silicon carbide composite powders

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.
Inventors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. (Midland, MI)
Issue Date:
OSTI Identifier:
870454
Assignee:
Dow Chemical Company (Midland, MI) LLNL
Patent Number(s):
US 5525556
Application Number:
08/484,539
Contract Number:
86X-SK761C
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
silicon; nitride; carbide; composite; powders; prepare; nitride-silicon; carbothermal; reduction; crystalline; silica; powder; carbon; optionally; portion; mean; diameter; 700; nanometers; contains; nitrogen; sintered; ceramic; bodies; self-reinforced; silica powder; carbide composite; nitride powder; silicon nitride; silicon carbide; crystalline silicon; sintered ceramic; carbon powder; composite powders; ceramic bodies; nitride ceramic; carbide portion; carbothermal reduction; crystalline silica; silicon nitride-; silicon nitride-silicon; nitride-silicon carbide; contains nitrogen; -silicon carbide; prepare silicon; /501/423/