| 摘要 |
A method is described for improving the erosion and abrasion wear resistance and hardness of the internal wear surfaces of structures such as nozzles, jets, ducts, chutes, powder handling tubes, valve housings, conveyors, drill bushings and the like. A substantially pure tungsten layer is chemical vapor deposited on the internal wear surface of the body of the structure followed by a chemical vapor deposited top coating comprising a mixture of tungsten and tungsten carbide. The tungsten carbide is selected from the group consisting of W2C, W3C, and mixtures thereof and is fine grained, non-columnar and has a substantially layered microstructure. Also described are structures formed by the method.
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