Back to results
US 4,045,597 AGranted
Process for modifying amorphous carbon filaments
AssigneeAvco Corporation
InventorHarold E. Debolt
Life of this patent
Estimating the term…
Abstract
A filamentary reinforcement product for composites used in applications requiring high strength and high modulus of elasticity materials, particularly under high temperature service conditions, comprising one mil thick or thicker coatings of boron or boron carbide on a substrate which comprises about a one mil diameter carbon substrate having a catalytically transformed skin layer of highly oriented graphite formed from the carbon substrate using a boron catalyst.
Claims7
A process for modifying amorphous carbon filament for use as a filamentary reinforcement for composites comprising:
- depositing a flash coating of boron on said filament;
- subsequently heat treating the flash coated filament at a temperature above 2,100.degree. C in an inert atmosphere for catalytically transforming the amorphous carbon into a skin layer of highly oriented graphite such that the resistance of the filament with the skin layer aas a whole decreases by a factor of at least two times.
Dependencies are inferred from the claim text.