Surface-coated SiC whiskers, processes for preparing the same, c

Details Surface-coated SiC whiskers, processes for preparing the same, c Surface-coated SiC whiskers, processes for preparing the same, c

1988-05-31

1990-05-29

Bell, Mark L.

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427228, 501 89, 501 92, B05D 302

Patent

active

049294725

ABSTRACT:
Disclosed are surface-coated SiC whiskers, proceses for preparing the same, a ceramic reinforced with the same, and a process for preparing said reinforced ceramic. The surface-coated SiC whiskers are SiC whiskers (I) having a surface coated with a thin carbonaceous layer having a thickness of 7 to 100 .ANG., or SiC whiskers (II) having a surface coated with an Si.sub.3 N.sub.4 layer. The SiC whiskers (I) can be prepared by dispersing SiC whiskers in a homogeneous solution of a thermosetting resin in an organic solvent, separating the whiskers by filtration and drying it, curing the thermosetting resin, and firing the cured thermosetting resin in a non-oxidizing atmoshpere at 800.degree. to 1,600.degree. C. The SiC whiskers (II) can be prepared by dispersing SiC whiskers in a solution of an organosilicon polymer in an organic solvent, separating the whiskers by filtration and drying it, heating the whiskers coated with the organosilicon polymer in a nitriding atmoshpere at 1,200.degree. to 1,600.degree. C. A ceramic reinforced with the SiC whiskers (I) or (II) is obtained by mixing a ceramic powder with the SiC whiskers (I) or (II) and sintering the mixed powder in an inert atmosphere or in vacuo.

REFERENCES:
patent: 3416944 (1968-12-01), Pirrung et al.
patent: 3861947 (1975-01-01), Hamling
patent: 4407866 (1983-10-01), Kitamura et al.
patent: 4786524 (1988-11-01), Ardavy et al.
Am. Ceram. Soc. Bull. 64[2], 298 to 304 (1985).
"25th Yogyo Kiso Toronkai Koen Yoshishu", p. 41 (1987).

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