Abstract
This paper reports on a new chemical vapor deposition (CVD) process that has been developed to deposit hard coatings, containing tungsten carbide, at temperatures below 500{degrees} C. These coatings, which have been applied to both ferrous and nonferrous alloys, exhibit excellent resistance to wear and erosion. The coatings comprise a mixture of tungsten and the tungsten carbide, the latter being present as W{sub 2}C, W{sub 2}C + W{sub 3}C or W{sub 3}C. The coatings' composition and properties can be controlled by varying the CVD process parameters. The unique lamellar, fine-grained microstructures of these coatings contribute to their good tribological properties.
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