Preparation and uses of amorphous boron carbide coated substrates
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsRobert E. Riley, Lawrence R. Newkirk, Flavio A. Valencia, Wallace, Sr., Terry C.
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Abstract
Cloth is coated at a temperature below about 1000.degree. C. with amorphous boron-carbon deposits in a process which provides a substantially uniform coating on all the filaments making up each yarn fiber bundle of the cloth. The coated cloths can be used in the as-deposited condition for example as wear surfaces where high hardness values are needed; or multiple layers of coated cloths can be hot-pressed to form billets useful for example in fusion reactor wall armor. Also provided is a method of controlling the atom ratio of B:C of boron-carbon deposits onto any of a variety of substrates, including cloths.
Claims10
A method of coating graphite cloth with a coating of amorphous boron carbide which is substantially uniform on all filaments throughout each yarn bundle of said cloth, said method comprising:
- contacting said graphite cloth with a mixture of BCl.sub.3, at least one hydrocarbon selected from the group consisting of propene and methane, and hydrogen at a coating temperature within the range from about 850.degree. to about 900.degree. C. and at a total pressure within the range from about 15 torr to about 35 torr.
An article of manufacture comprising a unified, compacted, hot-pressed structure comprising a multiplicity of layers of ceramic cloth formed from multifilamentary ceramic yarn, substantially all tiny filaments of which are surrounded by and separated from each other by interstitially deposited boron carbide.
Dependencies are inferred from the claim text.