Properties of Cr3C2-NiCr Cermet Coating Sprayed by High Power Plasma and HVOF Processes

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The structure, hardness and shear adhesion strength have beeninvestigated in Cr3C2-NiCr cermet coatings sprayed onto a mild steelsubstrate by 200 kW high power plasma spraying (HPS) and high velocityoxy-fuel (HVOF) processes. Amorphous and supersaturated nickel phasesform in both as-sprayed coatings. The hardness of the HVOF coating ishigher than that of the HPS coating because the HVOF coating containsmore non-melted Cr3C2 carbide particles. On heat-treating at 873 K, theamorphous phase decomposes and the supersaturated nickel phaseprecipitates Cr3C2 carbides so that the hardness increases in the HPScoating. The hardness measured with a large load exhibits lower valuescompared with that measured with a small load because of cracksgenerated from the indentation. The ratio of the hardnesses measuredwith different loads can be regarded as an index indicating the coatingductility. The ductility of the HVOF coating is higher than that of theHPS coating. Adhesion strength of the HVOF coating was high comparedwith the HPS coating. The adhesion of the coatings is enhanced byheat-treating at 1073K and that of the HVOF coating was over 350 MPa.

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