Deposition of improved SiC coatings on carbon-base materials
AssigneeUnited Technologies Corporation
InventorsRichard D. Veltri, Francis S. Galasso
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Abstract
Carbon-carbon composite materials are provided with significantly enhanced oxidation resistance by the formation of a SiC coating. The coating is produced from a pack containing a small but effective amount of boron. The balance of the pack is preferably based on Al.sub.2 O.sub.3, SiO.sub.2, and Si. The composite to be coated is embedded in the pack and heated to an elevated temperature. The boron addition provides a conversion SiC coating having enhanced resistance to oxidation.
Claims1
An improved pack material for the formation of SiC coatings on carbon-base materials consisting essentially of about:
- about 60% SiC powder,
- about 30% Si powder,
- about 1% B powder,
- about 9% Al.sub.2 O.sub.3 powder.
Dependencies are inferred from the claim text.