干摩擦条件下WC增强Cu-Mn-Ni复合涂层的磨损性能研究

Study on Wear Resistance of WC/Cu-Mn-Ni Brazing Coating Under Dry Sliding

通过钎焊工艺在 45 # 钢表面沉积WC颗粒增强Cu -Mn -Ni复合涂层 ,考察了WC颗粒尺寸及含量对WC/Cu-Mn -Ni复合涂层耐磨性能的影响 .实验结果表明 :在给定的试验条件下 ,当WC颗粒质量分数为 30 %而平均粒径为 15 0 μm时 ,复合涂层的耐磨性最佳 ;WC颗粒对复合涂层磨损过程及磨损机制具有显著的影响 ,磨损机理表现为表面微突体间相互滑动产生塑性变形、粘着。

The composite coating of Cu-Mn-Ni reinforced with tungsten carbide (WC) was prepared by brazing. The influence of the particle size and the mass fraction of WC particles on the wear resistance of the WC/Cu-Mn-Ni composite coating was investigated by sliding against AISI-52100 steel under dry sliding. The morphologies of the worn coating surface and the wear debris were observed with a scanning electron microscope. The results show that the composite coating containing WC particles coated with Ni-P whose mass fraction is 30% and the particle size is 150 μm possesses the optimal wear resistance. The composite coating is characterized by plastic deformation, adhesion, plough and spalling. And the spalling of WC particles during the friction process has a significant influence on the wear resistance and the wear mechanism of the composite coating.