Air Products and Chemicals, Inc.

Christopher Ceccarelli

Paul N Dyer

Diwaker Garg

Richard W Kidd

Beth A Klucher

Diwakar Garg

Robert E Stevens

Paul Nigel Dyer

An extremely hard, fine grained tungsten carbide produced by thermochemical deposition is described. The tungsten carbide consists primarily of substantially pure tungsten carbide wherein the tungsten carbide consists of WC.sub.1-x, where x is 0 to about 0.4. The disclosed tungsten carbide is free of columnar grains and consists essentially of extremely fine, equiaxial crystals. Also disclosed is a method of producing the disclosed material.

High hardness fine grained beta tungsten carbide

Extremely hard, fine grained tungsten/carbon alloys are described which are produced by thermochemical deposition. The alloys consist primarily of a mixture of a substantially pure tungsten phase and at least one carbide phase wherein the carbide phase consists of W.sub.2 C or W.sub.3 C or a mixture of W.sub.2 C and W.sub.3 C. The disclosed tungsten/carbon alloys are free of columnar grains and consist essentially of extremely fine, equiaxial crystals. Also disclosed is a method of producing the disclosed material.

High hardness fine grained tungsten-carbon alloys

A method for producing the disclosed material comprises introducing into a chemical vapor deposition (CVD) reactor a mixture of process gases comprised essentially of (1) tungsten hexafluoride, (2) a volatile oxygen- and hydrogen-containing organic compound, and (3) hydrogen; controlling the ratio of the tungsten hexafluoride to the oxygen- and hydrogen-containing organic compound within the CVD reactor so that the W/C atomic ratio is within the range of about 0.5 to about 15; controlling the reaction temperature so it is within the range of above about 300.degree. to less than about 650.degree. C.; controlling the total pressure within the range of about 1 Torr. to about 1,000 Torr.; and controlling the ratio of H.sub.2 to WF.sub.6 within the range of about 4 to about 20; to produce W and W.sub.2 C, W and W.sub.3 C, or W and W.sub.2 C and W.sub.3 C.

Method for depositing a hard, fine-grained, non-columnar alloy of

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Whitehall, PA, United States of America

Christopher Ceccarelli