Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1989-08-02
1990-05-22
Roy, Upendra
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428628, 428635, 428665, B32B 1504
Patent
active
049277138
ABSTRACT:
An improved highly erosive and abrasive wear resistant multi-layered coating system on a substrate which provides protection against impact of large particles is disclosed comprising a plurality of composite layers. In each of the composite layers, the first layer closest to the substrate comprises tungsten of sufficient thickness to confer substantial erosion and abrasion wear resistance characteristics to the coating system and a second layer deposited on the first layer comprises a mixture of tungsten and tungsten carbide and the tungsten carbide comprises W.sub.2 C, W.sub.3 C, or a mixture of both. Because the resulting coating system has enhanced high cycle fatigue strength over the substrate, the coating system is especially useful on such structures as turbine blades and similar articles of manufacture where such high stress cycles occur during normal operation. Also dislcosed is the method for preparing such improved composite coating systems.
REFERENCES:
patent: 3389977 (1968-10-01), Tarver
patent: 4741975 (1988-05-01), Naik et al.
patent: 4761346 (1988-08-01), Naik
Dyer Paul N.
Fabregas Keith R.
Garg Diwakar
Mueller Carl F.
Schaffer Leslie E.
Air Products and Chemicals Inc.
Dannells, Jr. Richard A.
Marsh William F.
Roy Upendra
Simmons James C.
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