集束电极电火花合成沉积TiN涂层组织及耐磨性能  

Microstructure and Wear Resistance of TiN Coating Synthesized by Electric Spark Deposition with Cluster Electrode

作　　者：徐安阳 王晓明 朱胜[1] 常青 袁鑫鹏 周克兵 XU Anyang;WANG Xiaoming;ZHU Sheng;CHANG Qing;YUAN Xinpeng;ZHOU Kebing(National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China)

机构地区：[1]陆军装甲兵学院装备再制造技术国防科技重点实验室

出　　处：《中国表面工程》2019年第3期115-122,共8页China Surface Engineering

基　　金：国家重点研发计划(2018YFB1105800);中国博士后科学基金(2017M623445)~~

摘　　要：为满足提高铜合金表面耐磨性能的需求,提出了一种利用集束钛电极在QAl9-4铝青铜旋转工件表面电火花合成沉积TiN涂层的新方法,并进行了试验研究。结果表明:在铜合金表面制备出了均匀连续的TiN涂层;涂层表面由细化了的晶粒结构构成,组织致密;电极丝对涂层表面有较强的磨削涂覆作用,显著降低了涂层表面粗糙度值;涂层主要由TiN硬质相构成,厚度为85μm左右,显微硬度可达890 HV0.05,约为基体(185 HV0.05)的4.8倍;涂层与基体间具有合金化冶金结合的过渡层;涂层表面摩擦因数为0.125~0.2,远小于基体(0.23~0.35)且波动性较小,磨损率约为基体的49.6%,具有更好的减摩耐磨特性。A new method of electric spark discharge(ESD) was proposed to improve the wear resistance of copper alloys. TiN strengthened coating was formed on the surface of QAl9-4 aluminium bronze rotating workpiece through the reaction of titanium cluster electrode with nitrogen under the action of ESD heating. The results show that a uniform and continuous TiN coating was formed on the surface of copper alloy. The surface of the TiN coating is composed of refined grain structure and compact structure. The electrode wire has a strong grinding pin coating effect on the surface of the coating, which significantly reduces the roughness of the coating surface. The sum of the titanium and nitrogen atomson on the surface of the coating layer and the end of the electrode wire is more than 90%. The coating is composed mainly of TiN hard phase with a thickness of about 85 μm. The micro-hardness of the coating can reach 890 HV0.05, which is about 4.8 times of the substrate(185 HV0.05).There is an alloying metallurgical bonding layer between the coating and the substrate. The friction coefficient of the coating is0.125-0.2, which is much smaller than that of the substrate(0.23-0.35), and the fluctuation is small. The wear rate of the TiN coating is about 49.6% of the substrate. The TiN coating has better antifriction and wear resistance than the substrate.

关 键 词：电火花沉积 集束电极 合成沉积 TIN涂层 耐磨性 磨损率 

分 类 号：TG174.44[金属学及工艺—金属表面处理]