Oxidation-inhibited carbon-carbon composites

Details Oxidation-inhibited carbon-carbon composites Oxidation-inhibited carbon-carbon composites

B - Operations, Transporting

32

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117/103, 18/11

B32B 9/00 (2006.01) B32B 15/14 (2006.01) C04B 35/83 (2006.01) C04B 41/50 (2006.01) C04B 41/87 (2006.01)

Patent

CA 1287711

OXIDATION-INHIBITED CARBON-CARBON COMPOSITES ABSTRACT OF THE DISCLOSURE Carbon-carbon composites consisting of graphite fibers reinforcing a carbon matrix are protected from oxidation by a B2O3 glass coating which includes a refractory oxide to stabilize the viscosity of the glass. Precursors of B2O3 and the refractory oxide are dispersed into a resin, the resin is used to impregnate fibrous graphite or fibrous graphitizable material, the sheets are laid up as plies and the laid-up plies are carbonized and graphitized using heat and pressure to form a carbon-carbon composite structure. The composite structure is then coated with an additional mix of resin and precursors, and the coated structure is heated to carbonize the resin and leave a seal coat on the structure. Then an outer shell of a refractory material is deposited on the structure. Oxygen which seeps into the structure at high temperatures is initially scavenged by the RO and B2O3 precursors, converting the same to a B2O3-RO glass which protects both the internal pore surfaces of the composite as well as the outer structural surfaces from oxidation.

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