Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1988-04-25
1990-09-11
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 89, 501 92, 501 95, 501 97, 501 98, 264 63, C04B 3556, C04B 3558, C04B 3576, C04B 3510
Patent
active
049563165
ABSTRACT:
Silicon carbide whiskers such as those used in reinforcing ceramic composites are deagglomerated by dispersing the whiskers in an aqueous silane dispersant comprising a silane containing nonreactive hydrocarbon groups and reactive hydrolyzable groups, a cationic lubricant and an acid to provide a dispersant pH of about 3.5 to about 6.0. The whiskers can be deagglomerated prior to mixing with the ceramic powder used to form the composite or the whiskers, ceramic powder and aqueous silane dispersant can be mixed simultaneously. Dispersal permits classification and selection of specific aspect ratio distributions for the ceramic composite. Deagglomeration permits use of higher vol. % SiC whiskers while still attaining greater than 99% density.
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Bell Mark L.
Brunsman David M.
Hoechst Celanese Corp.
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