Preceramic compositions and ceramic products

Details Preceramic compositions and ceramic products Preceramic compositions and ceramic products

1990-01-17

1991-08-20

Marquis, Melvyn I.

Stock material or miscellaneous articles

Composite

Of silicon containing

524214, 524226, 524439, 524441, 524492, B32B 904

Patent

active

050413376

ABSTRACT:
Preceramic polymer dispersions which have particular utility in providing protective ceramic coatings having low moisture sensitivity on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials are prepared by dispersing about 0-3 parts by weight of aluminum-silicon eutectic, about 0-4 parts by weight of silicon carbide, about 1.5-5 parts by weight of silicon boride, and about 0.4-5 parts by weight of silicon metal in a solution or dispesion obtained by dispersing about 0.1-1.0 parts by weight of a Group IIA metal salt in an organoborosilazane polymer obtained by reacting about 0.25-20 parts by weight of a trialkoxy-, triaryloxy-, or tri(arylalkoxy)boroxine with one part by weight of a polysilazane in an organic solvent and, if desired, heating the dispersion to convert it to a solution.

REFERENCES:
patent: 4550151 (1985-10-01), Takamizawa et al.
patent: 4921925 (1990-05-01), Niebylski

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