摘要
采用纳米镍-钴镀层制备电镀金刚石工具以期提高工具的性能。通过考察脉冲参数、细化添加剂、硫酸钴对镀层显微硬度的影响,得出结论:细化添加剂、硫酸钴都能细化晶粒,两者有竞争关系;改变峰值电流密度和开通时间可以细化晶粒,脉冲周期过短会造成晶粒粗化。镀层中钴的质量分数为9%,表面较光整,平均晶粒尺寸在14nm左右,显微硬度达到609HV。确定了制造金刚石工具最佳的电镀工艺参数,由其制得的工具平均寿命比纳米镍镀层材料工具高16%。
To improve the properties of electroplated diamond tools, nano Ni--Co is applied in the preparation process. Influences of pulse parameters, refining additives and COSO4 on the micro hardness of coating are investigated. Results show that the additives and CoSO4 can refine the grains while they also compete with each other. Also, changing the peak current density and opening time could re＇fine the grains while if the pulse cycle is too short, it will coarsen the grains. The mass fraction of Co in the coating is 9%, and the surface is finished. Average size of grains is about 14 nm, and the micro-hardness reaches 609 HV. With optimized electroplating technology parameters, average life of diamond tools is 16% higher than the ones of nano Ni matrix material.
出处
《金刚石与磨料磨具工程》
CAS
2014年第2期40-43,47,共5页
Diamond & Abrasives Engineering
基金
河南省自然科学基金(0811051300)
关键词
金刚石工具
纳米镍钴镀层
显微硬度
脉冲参数
diamond tool
nano-crystalline Ni-Co coating
micro-hardness
pulse parameters
