搅拌方法对Ni/TiN复合镀层微观结构和耐磨性能的影响

采用机械搅拌-电沉积和超声搅拌-电沉积复合方法,在20钢基体表面制备Ni/TiN复合镀层。利用扫描电镜(SEM)和摩擦磨损试验机对复合镀层进行研究。结果表明:当机械搅拌速率为400 r/mim时,Ni/TiN复合镀层的TiN粒子复合量的质量分数为9.8%,显微硬度为871HV;当超声波功率为300 W时,Ni/TiN复合镀层的TiN粒子复合量的质量分数为10.9%,显微硬度为926HV。在机械搅拌-电沉积制得的Ni/TiN复合镀层中,表面颗粒的粒径在3μm左右,而超声搅拌-电沉积制备镀层,表面颗粒的平均粒径为1μm。采用超声搅拌-电沉积制备Ni/TiN复合镀层,耐磨性能优于机械搅拌-电沉积制备的镀层。

Effect of stirring modes on microstructure and wear resistance of Ni/TiN composite coatings

Ni/TiN composite coatings were prepared on the 20 steel by mechanical stirring and ultrasonic stirring method.The TiN particle content,microstructures and wear resistance of Ni/TiN composite coatings were investigated.The results indicate that the TiN particle contents of Ni/TiN composite coatings prepared by ultrasonic stirring and mechanical stirring electrodeposition are 10.9 and 9.8%(mass fracture),respectively,and the micro-hardnesses are 871 and 926HV,respectively.The surface particle diameters of the Ni/TiN composite coating prepared by mechanical stirring and ultrasonic electrodeposition are about 3 and 1 μm.The wear tester shows that the abrasion loss for Ni/TiN composite coating prepared by ultrasonic stirring electrodeposition is less than that prepared by mechanical stirring electrodeposition.