Preparation and mechanical properties of two nickel base alloy coatings achieved by electrospark deposition  

作　　者：Ping ZHANG Lin MA Zhijie LIANG Junjun ZHAO 

机构地区：[1]Technology and Science Laboratory on Remanufacturing, Academy of Armored Force Engineering,Beijing 100072, China [2]Institute of Chemical Defense Engineering, Beijing 102205, ChinaManuscript received 9 August 2010 in revised form 7 December 2010

出　　处：《Acta Metallurgica Sinica(English Letters)》2011年第4期309-314,共6页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50801066)

摘　　要：Ni398 and Ni818 base alloy coatings were deposited on 1045 steel by electrospark deposition technique （ESD）. Forming properties, thickness, microhardness and wear resistance of the coatings were investigated. The chemical composition and cross- section morphology were analyzed through energy dispersive spectrum （EDS） and metalloscope. The results show that the technological parameter window of Ni398 is larger than that of Ni818 electrode. However, other properties of the Ni818 coating, such as thickness and microhardness, were better than those of the Ni398 coating. Especially the wornout volume of Ni818 coating is only 1/6 of that for 1045 steel and 1/3 for Ni398 coating. Chemical composition analysis indicated that the addition of Mo promoted grain refinement of nickel alloy. Metallographic analysis shows that the molten droplets of Ni398 coatings have an average structure thickness of 20-40 #m while the microstructure of Ni818 coatings is flat with width of 5-20 #m.Ni398 and Ni818 base alloy coatings were deposited on 1045 steel by electrospark deposition technique （ESD）. Forming properties, thickness, microhardness and wear resistance of the coatings were investigated. The chemical composition and cross- section morphology were analyzed through energy dispersive spectrum （EDS） and metalloscope. The results show that the technological parameter window of Ni398 is larger than that of Ni818 electrode. However, other properties of the Ni818 coating, such as thickness and microhardness, were better than those of the Ni398 coating. Especially the wornout volume of Ni818 coating is only 1/6 of that for 1045 steel and 1/3 for Ni398 coating. Chemical composition analysis indicated that the addition of Mo promoted grain refinement of nickel alloy. Metallographic analysis shows that the molten droplets of Ni398 coatings have an average structure thickness of 20-40 #m while the microstructure of Ni818 coatings is flat with width of 5-20 #m.

关 键 词：Electrospark deposition Nickel base alloy electrode Coatingproperty 

分 类 号：TG661[金属学及工艺—金属切削加工及机床] TM621.2[电气工程—电力系统及自动化]