Preceramic compositions and ceramic products

Details Preceramic compositions and ceramic products Preceramic compositions and ceramic products

1989-06-30

1991-04-23

Marquis, Melvyn I.

Stock material or miscellaneous articles

Composite

Of silicon containing

501 92, 524174, 524176, 524413, 524431, 524439, 524442, B32B 904

Patent

active

050099612

ABSTRACT:
Preceramic polymer dispersions which have particular utility in providing protective ceramic coatings on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials are prepared by dispersing about 0.25-2.0 parts by weight of silicon metal, about 0.25-2.0 parts by weight of silicon tetraboride, about 0.25-2.0 parts by weight of silicon hexaboride, and about 0-2 parts by weight of silicon carbide in the product obtained by dispersing about 0.1-1.0 part by weight of a Group IVA metal salt or an organometallic Group IVA metal compound in an organic solvent solution containing one part by weight of a polysilazane and, if desired, heating the Group IVA compound/polysilazane dispersion to convert it to a solution.

REFERENCES:
patent: 4397828 (1983-08-01), Seyferth et al.
patent: 4482669 (1984-11-01), Seyferth et al.
patent: 4645807 (1987-02-01), Seyferth et al.
patent: 4650837 (1987-03-01), Seyferth et al.
patent: 4659850 (1987-04-01), Arai et al.

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