两种激光熔覆法对 Ni－WC复合涂层耐磨性的影响研究

摘要

比较了两种激光熔覆法制备的Ni基WC复合涂层的耐磨性。结果表明，通过三级激光熔覆法制造有梯度变化的涂层或采用优化WC颗粒浓度、激光功率获得有明显梯度分布的涂层都可以制备出无气孔夹杂的涂层，但三级激光熔覆法制备的涂层在磨损一定时间后会导致磨损量急剧增大，不适宜应用于长期磨损的涂层。%Wear resistance of Ni based WC composite coating prepared with two laser cladding methods is compared in the paper .The research shows that nonporous coating can be prepared by using three-grade laser clad-ding to prepare gradient coating or by using optimized WC particle concentration with clear gradient coating .How-ever, the erosion of the coating prepared by using three-grade laser cladding increases significantly after a period of wearing, which is not suitable for coating exposed to long-term wearing.