Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1982-12-28
1984-08-14
Poer, James
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501154, 4274197, 428408, C04B 3556
Patent
active
044657773
ABSTRACT:
In accordance with the invention, a composition of matter is provided for forming a coating for protecting carbonaceous substrates from degradation at elevated temperatures. The composition is a mixture of particulate silicon, silicon carbide and boron. The mixture contains between about 25% and 40% silicon by weight of the total composition, between about 50% and 70% by weight silicon carbide by weight of the total composition, between about 1% and 15% boron by weight of the total composition and a minor amount of magnesium oxide. The method is provided for forming a primary protective coating on carbonaceous substrates utilizing the aforesaid mixture. An enhancement coating is provided for sealing the primary coating in applications where the substrate will be subjected to elevated temperatures and temperature cycling.
REFERENCES:
patent: 3853566 (1974-12-01), Prochazka
patent: 3947550 (1976-03-01), Fitchmun
patent: 3960577 (1976-06-01), Prochazka
patent: 4080415 (1978-03-01), Coppola et al.
patent: 4133689 (1979-01-01), Stroke
patent: 4224073 (1980-09-01), Sasaki et al.
Poer James
Vought Corporation
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