Moisture and oxidation resistant carbon/carbon composites

Details Moisture and oxidation resistant carbon/carbon composites Moisture and oxidation resistant carbon/carbon composites

1989-12-13

1994-03-29

Turner, A. A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428212, 428213, 4283191, 4283077, 428323, 428330, 428408, 428446, 428469, 428697, 428698, 428699, 428701, 428702, B32B 900

Patent

active

052983110

ABSTRACT:
Carbon/carbon composites including those structures formed from a fibrous reinforcement itself formed principally from carbon in a carbon matrix are protected against oxidation by multi-layer sealant system preferably including a multi-layer paint including in its carbonized binder refactory granules and inhibitor particles that form a moisture resistant, viscosity-stabilized borate glass when exposed to a high-temperature, oxidizing environment, and an outer ceramic shell formed by CVI/CVD in situ formation of boron carbide followed by silicon carbide. The paint is prepared by mixing finely divided powders of borate precursor compounds or borate glass frit and refractory granules with a carbon char yielding precursor binder such as phenolic resin or pitch which preferably produces a highly porous structure upon carbonization.

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