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

1990-02-12

1990-12-04

Bell, Janyce

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427226, 427228, 427255, 427344, 427377, B05D 302

Patent

active

049753029

ABSTRACT:
Disclosed are surface-coated SiC whiskers, processes 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 atmosphere at 800.degree. to 1,600.degree. C. The SiC whiskers (II) can be prepared by the dispersing SiC whiskers in a solvent 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 atmosphere 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: 2738290 (1956-03-01), Janes
patent: 2754221 (1956-07-01), Caroselli
patent: 3231540 (1966-01-01), Vanderbilt
patent: 4230773 (1980-10-01), Bakos

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