Process for the manufacture of sinterable silicon carbide and/or boron carbide powders
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United States of America Patent
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Jul 12, 1988
Issued Date -
N/A
app pub date -
Jul 22, 1987
filing date -
Mar 7, 1985
priority date (Note) -
Expired
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Abstract
The invention is a process for the manufacture of sinterable silicon carbide and/or boron carbide powders having a maximum particle size of 1 .mu.m and finer. The process is carried out by wet grinding in aqueous suspension using mills charged with a grinding medium and with the addition of antioxidants in the presence of surfactants and subsequent wet chemical treatment with an aqueous potassium hydroxide solution. The wet grinding can be carried out, for example, with the addition of hydroquinone in the presence of quaternary ammonium salts and the wet chemical treatment with a 5-50% by weight aqueous potassium hydroxide solution under normal pressure at temperatures in the range of from room temperature to the boiling temperature of the reaction mixture or under elevated pressure at temperatures of up to 300.degree. C.
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