Abstract：To explore the effects of WC content on the microstructures and high temperature tribological behavior of Co-based alloy composite cladding layers, WC/Co-based alloy cladding layers with different WC contents were prepared by plasma cladding process. The microstructures, hardness, and friction and wear properties of the composite cladding layers were systematically investigated. The results show that the microstructure of the cladding layer is composed of cellular, columnar, and dendritic crystal zones when the content of WC is low. As the WC content increasing, a large number of irregularly shaped fine (Co,W)C carbides and undissolved WC particles are formed inside the composite cladding layer, which significantly improves the hardness and friction and wear properties of the composite cladding layers. The microhardness of the composite cladding layer is enhanced with the increase of WC content, showing the best hardness of 752 with the WC mass fraction of 40%, which is 76% higher than that of the cladding layer without WC. The WC reinforced composite cladding layers exhibit excellent wear resistance. The friction factor decreases first then increases, and then decreases again, and the wear volume loss decrease firstly and then increase with the increase of WC content. The cladding layer with WC mass fraction of 20% shows the best high temperature wear performance, of which the average friction factor at 600 ℃ is 0.235, and the wear volume loss is 25.13×108 μm3, the wear forms are oxidative wear and fatigue wear.
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