Surface modification of Ti-6Al-4V alloy by cathode assiting discharge setup and conventional plasma nitriding methods  

作　　者：TANG JinGang LIU DaoXin TANG ChangBin ZHANG XiaoHua 

机构地区：[1]Corrosion & Protection Research Institute,Northwestern Polytechnical University [2]Xi'an University of Architecture and Technology

出　　处：《Science China(Technological Sciences)》2013年第8期1858-1864,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51171154,51101127)

摘　　要：In order to improve the wear resistance of titanium alloys,the potential of the plasma nitriding process with a cathode assiting discharge setup was examined.Ti6Al4V alloy was nitrided by the cathode assiting discharge nitriding(CAN) and conventional DC plasma nitriding(CPN) methods,respectively.The micro-topography,phase composition and cross-sectional microhardness distribution of two nitriding layers were studied comparatively.The sliding wear resistance of the nitriding layers was examined by a ball-on-disk test against Si3N4 balls.The results indicated that the surface roughness Ra of the CAN layer was about 1 order less than that of the CPN layer.In addition,the CAN surfaces possessed significantly greater wear resistance than the CPN layer at higher loads,and increased the wear resistance of Ti6Al4V alloy by about 2 orders due to the higher loading bearing ability,higher rate of TiN phase,greater surface microhardness and bigger microhardness improving depth.This is because the double glow discharge effect in CAN strengthened the density of the active nitrogen atoms and the nitriding efficiency.Moreover,the ion bombardment effect on the surface of the nitriding titanium alloy was reduced obviously.

关 键 词：NITRIDING TI6AL4V cathode assiting discharge wear 

分 类 号：TG174.4[金属学及工艺—金属表面处理]