钛合金表面电火花沉积NiCr-3涂层性能的工艺规律研究  

Study on the Process Law of Electro-spark Deposition of NiCr-3 Coating on Titanium Alloy

作　　者：刘宇[1] 刘国良 苏全宁 曲嘉伟 王紫光 张生芳[1] LIU Yu;LIU Guoliang;SU Quanning;QU Jiawei;WANG Ziguang;ZHANG Shengfang(School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学机械工程学院,辽宁大连116028

出　　处：《电加工与模具》2021年第6期26-30,共5页Electromachining & Mould

基　　金：国家自然科学基金面上项目(51875074);辽宁省教育厅自然科学基础项目(JDL2020009)。

摘　　要：钛合金的发展因表面耐磨性及耐腐蚀性能差而受限,故对其进行表面强化处理是扩展钛合金应用的直接途径。电火花沉积技术能有效地提高钛合金工件的表面性能。以NiCr-3为电极在TC4钛合金表面电火花沉积涂层,并对沉积涂层表面进行磨损和腐蚀试验,研究不同工艺参数对涂层耐磨性和耐腐蚀性的影响。结果表明:涂层的耐磨性随着沉积电压以及沉积频率的增大而逐渐提高;沉积涂层的耐磨性随着比沉积时间的增加而提高,当比沉积时间超过70 s/cm^(2)后,涂层的耐磨性逐渐趋于稳定;涂层的耐腐蚀性随着沉积频率的增大而逐渐提高;随着沉积电压以及比沉积时间的增加,沉积涂层的耐腐蚀性先不断提高后有所降低。The wear resistance and corrosion resistance of titanium alloy surface are poor,and these can be effectively improved by electro-spark deposition.The coating was deposited on TC4 titanium alloy with NiCr-3 as electrode.The wear and corrosion tests were carried out to study the effects of different process parameters on the wear resistance and corrosion resistance of the coating.The results show that the wear resistance of the coating increases with the increase of deposition voltage and deposition frequency.The wear resistance of the deposited coating increases with the increase of specific deposition time,and tends to be stable after the specific deposition time exceeds 70 s/cm^(2).The corrosion resistance of the coating increases with the increase of deposition frequency.With the increase of deposition voltage and specific deposition time,the corrosion resistance of the deposited coating firstly increases and then decreases.

关 键 词：电火花沉积 钛合金 NiCr-3涂层 工艺规律 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]