Highly erosive and abrasive wear resistant composite coating sys

Details Highly erosive and abrasive wear resistant composite coating sys Highly erosive and abrasive wear resistant composite coating sys

1988-02-08

1989-08-08

Andrews, Melvyn J.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428628, 428665, 428680, B32B 1504

Patent

active

048551880

ABSTRACT:
A highly erosive and abrasive wear resistant composite coating system is described in which an intermediate layer of substantially pure tungsten is deposited on a substrate. An outer layer is then deposited comprised of a mixture of tungsten and tungsten carbide, with the tungsten carbide consisting of W.sub.2 C, W.sub.3 C or a mixture of both. The thickness of the intermediate layer is sufficient to confer substantial erosive and abrasive wear resistance characteristics on the composite coating system. The ratio of the thickness of the intermediate layer to the thickness of the outer layer is controlled and is at least above 0.30 in the cases of W+W.sub.3 C, W+W.sub.2 C+W.sub.3 C and W+W.sub.2 C coatings.

REFERENCES:
patent: 3389977 (1968-06-01), Tarver
patent: 4741975 (1988-05-01), Naik et al.
patent: 4761346 (1988-08-01), Naik

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