Method for producing wear resistant internal surfaces of structu

Details Method for producing wear resistant internal surfaces of structu Method for producing wear resistant internal surfaces of structu

1989-07-31

1991-02-05

Morgenstern, Norman

Coating processes

Interior of hollow article coating

Coating by vapor, gas, mist, or smoke

427249, 427253, 4272552, 427327, 427328, 4273837, 427404, 427405, 4274197, 427437, C23C 1608, C23C 1632, C23C 1646

Patent

active

049903721

ABSTRACT:
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 W.sub.2 C, W.sub.3 C, 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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