制备方法对Ni-SiC镀层摩擦学性能的影响

Effect of preparation methods on wear property of Ni-SiC coatings

采用直流电镀、脉冲电镀和超声波辅助脉冲电镀方法,在20钢表面制备Ni-SiC镀层。利用扫描探针显微镜(SPM)、X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计及摩擦磨损试验机研究制备方法对Ni-SiC镀层显微组织、成分及摩擦学性能的影响。结果表明,制备方法对Ni-SiC镀层表面形貌有很大影响,超声波辅助脉冲电镀镀层Ni晶粒和SiC微粒的平均粒径分别为94.5和46.8nm,其最大显微硬度为924.3Hv。直流电镀、脉冲电镀和超声波辅助脉冲电镀Ni-SiC镀层的摩擦系数平均值分别为0.66,0.54和0.35,超声波辅助脉冲电镀镀层耐磨性能优良。

Ni-SiC coatings were prepared on the surface of 20 steel by direct current,pulse current and ultra-sound＋ pulse current plating methods,respectively.The effect of preparation methods on microstructures, components and wear properties was investigated by using scanning probe microscope （SPM）,X-ray diffraction （SXRD）,scanning electron microscope （SEM）,microhardness tester,and friction and wear tester.The results present that plating method has great influence on microstructures of Ni-SiC coatings.The average grain size of Ni and SiC in Ni-SiC coatings prepared by ultrasound＋pulse current plating was 94.5 and 46.8 nm,respectively. And the maximum microhardness was 924.3 Hv.The friction coefficients of Ni-SiC coatings synthetised by di-rect current,pulse current and ultrasound＋ pulse current plating are 0.66,0.54 and 0.35,respectively.The coating prepared by ultrasound＋pulse current plating has better wear resistance.