A WC-Co/NiCrBSi composite coating was made on 42CrMo steel through vacuum brazing technology. The effects of cobalt and WC-17Co content on the properties of the coating were analyzed. The abrasive wear resistance decreased as the cobalt content increased. The tensile strength of the coating increased with the increase of the WC-17Co content and the maximum strength approaches to 184MPa. The abrusive property of the composite coating is better than that of the WC-17Co/NiCrBSi flame overlaying and CoCrW overlaying.
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