Silicon carbide coated article with ceramic topcoat

Details Silicon carbide coated article with ceramic topcoat Silicon carbide coated article with ceramic topcoat

1990-01-17

1993-05-11

Nelson, Peter A.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428446, 501 90, 501 96, B32B 904

Patent

active

052099792

ABSTRACT:
Silicon carbide-coated carbonaceous substrates are overcoated with one or more ceramic layers derived from an organoborosilazane polymer solution containing 0-60% by weight of dispersed ceramic or preceramic powdered solids to seal the silicon carbide coating and provide better resistance to oxidative deterioration at elevated temperatures; the organoborosilazane polymer being the product 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. The thus-coated substrates are optionally overcoated with a buffer layer and then with one or more ceramic layers derived from polysilazane solutions or dispersions.

REFERENCES:
patent: 4482699 (1984-11-01), Seyferth et al.
patent: 4581468 (1986-03-01), Paciorek et al.
patent: 4910173 (1990-03-01), Niebylski
patent: 4921925 (1990-05-01), Niebylski

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