Abstract
Conventional chemical vapor deposition and physical vapor deposition processes for deposition of wear-resistant coatings were shown not to be effective for improvement in service lifetime of TiC- or TiCN-based cermets with the Ni Mo-based binder because of an active interaction of the binder with the coatings. A new technology for deposition of chromium-carbide-based multilayer coatings for cermet cutting tools was developed. The technology includes vacuum treating a substrate and results in deposition of a wear-resistant coating composed of a chromium carbide upper layer and an Ni-based interlayer between the carbide layer and the substrate. Substantial improvement in the wear resistance of coated cermet indexable inserts was achieved owing to the special structure of the coating and its unique properties. The results of examinations of corrosion, wear, oxidation resistance as well as other properties of the coated cermets are presented.
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