HIGH EROSION/WEAR RESISTANT MULTI-LAYERED COATING SYSTEM

摘要

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 W2C, W3C, 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 disclosed is the method for preparing such improved composite coating systems.