Composition and method for forming a protective coating on carbo

Details Composition and method for forming a protective coating on carbo Composition and method for forming a protective coating on carbo

1983-09-13

1996-05-21

Lovering, Richard D.

Stock material or miscellaneous articles

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

4274197, 501 88, 501154, B32B 900

Patent

active

055188168

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 way of the total composition and a minor amount of magnesium. The compositions can be used in a method for forming a primary protective coating on carbonaceous substrates including, in particular, reinforced carbon-carbon materials produced using chemical vapor deposition techniques.

REFERENCES:
patent: 3947550 (1976-03-01), Fitchmun
patent: 3960577 (1976-06-01), Prochazka
patent: 4080415 (1978-03-01), Coppola et al.
Donald M. Curry et al.: "Material Characteristics of Space Shuttle Reinforced Carbon-Carbon", pp. 1524-1534 & 1538, Apr. 1973.
Donald C. Rogers et al.: "Material Development Aspects of an Oxidation Protection System for a Reinforced Carbon-Carbon Composite", pp. 308-337.
Donald C. Rogers et al.: "Formation Mechanism of a Silicon Carbide Coating for a Reinforced Carbon-Carbon Composite", pp. 319-336.

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