【摘要】 采用watt镀液通过脉冲电沉积制得纳米镍沉积层。通过扫描电镜(SEM)、X射线衍射(XRD)分析了沉积层的表面形貌、结构和晶粒大小与脉冲参数的关系,分析表明:微观形貌为胞状结构,平均晶粒尺寸为10.3nm;随着占空比的减小,晶粒得以细化。研究了脉冲参数对纳米镍层显微硬度、抗拉强度的影响,最大拉伸强度大900MPa,为常规镍镀层的2.5倍;通过正交法得到最佳制造金刚石工具的脉冲参数,磨削加工试验显示,平均寿命为常规镍的1.5倍。更多还原

【Abstract】 Nano-crystal Nickel deposits were obtained by the traditional Watt nickel plating technique using pulse electro deposition.The relationship between pulse parameters and the morphology and texture of the Ni-coatings was studies by means of SEM and XRD.The analysis results showed that the micro-morphology displays a lumpy structure,the mean grain size is 10.6nm.With the decrease of duty cycle,the grain size is falling.The effect of pulse parameters on micro-hardness and tensile strength were investigated,the results showed that the biggest micro-hardness and tensile strength can reach to 591 HV and 900Mpa,about 4 and 2.5 times that of normal nickel layer.The optimized pulse parameters were obtained by the orthogonal experiments and had been applied in the manufacture of diamond tool successfully.更多还原