热处理条件对WC-Co涂层性能的影响  

Effect of Heat Treatment Conditions on Properties of WC-Co Coating

作　　者：王忠华 刘宜强 余音宏 吴杰 吕健 WANG Zhong-hua;LIU Yi-qiang;YU Yin-hong;WU Jie;LU Jian(Jiangxi Institute of Tungsten and Rare Earth,Ganzhou 341000,China;Chongyi Zhangyuan Tungsten Co.,Ltd.,Ganzhou 341000,China;Institute of Engineering&Research,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西省钨与稀土研究院,江西赣州341000 [2]崇义章源钨业股份有限公司,江西赣州341000 [3]江西理工大学工程研究院,江西赣州341000

出　　处：《稀有金属与硬质合金》2020年第5期23-28,共6页Rare Metals and Cemented Carbides

摘　　要：采用喷雾转化法制备WC-Co复合粉末,再经超音速火焰(HVOF)喷涂制备WC-Co耐磨涂层,并分别在N2和真空气氛中进行550、750、950℃热处理。研究了热处理条件对涂层物相、显微组织、硬度和耐磨性能的影响。结果表明:真空气氛热处理涂层较N2气氛热处理涂层的脱碳程度更低,且孔隙率也更低;真空热处理工艺可显著提高涂层硬度,改善涂层耐磨性,750℃真空热处理涂层磨损率可降至喷涂态涂层的47%,HV0.3硬度达到1 550。WC-Co composite powder prepared by spray conversion was used to prepare WC-Co wear-resis-tant coating by HVOF spraying,and then heat treatment of the coating was performed at 550 ℃,750 ℃ and 950 ℃ in N2 and vacuum atmosphere,respectively.The effects of heat treatment conditions on phase,microstructure,hardness and wear resistance of the coating were studied.The results show that the coating heat-treated in vacuum atmosphere has lower decarburization degree and porosity than the coating heat-treated in N2 atmosphere.The hardness and the wear resistance of the coating can be significantly improve through heat treatment in vacuum atmosphere.The wear rate of the coating heat-treated in vacuum at 750 ℃ can be reduced to 47% of that of the sprayed coating,and its HV0.3 hardness reaches 1 550.

关 键 词：WC-CO 涂层 喷雾转化 超音速火焰喷涂 热处理 气氛 温度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]