Article with internal wear resistant surfaces

Details Article with internal wear resistant surfaces Article with internal wear resistant surfaces

1990-10-19

1991-11-12

Lewis, Michael

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428628, 428665, 428932, B32B 1504

Patent

active

050647288

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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