氩弧熔覆原位自生(Ti,Nb)C增强镍基复合涂层的抗磨性能  

Wear resistance of (Ti, Nb)C reinforced Ni-based composite coating fabricated by in-situ argon arc cladding

作　　者：王永东[1] 李柏茹[1] 金国[2] 郑光海[1] 刘爱莲[1] 

机构地区：[1]黑龙江科技大学材料科学与工程学院,哈尔滨150022 [2]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001

出　　处：《粉末冶金材料科学与工程》2014年第6期983-988,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然基金青年基金项目(51201062);黑龙江省教育厅青年骨干教师计划项目(1253G051);黑龙江科技大学青年才俊计划资助项目

摘　　要：以Ti、C、Nb粉和Ni60A合金粉末为原料,采用氩弧熔覆技术在16Mn钢基材表面分别制备(Ti,Nb)C颗粒增强Ni60A复合涂层(C-Ti-Nb-Ni60A涂层)和Ni60A涂层。应用金相显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)对2种涂层的显微组织和物相进行观察与分析,测试涂层的显微硬度和不同载荷下的磨损性能,分析磨损机制。结果表明:C-Ti-Nb-Ni60A复合涂层与基体间呈冶金结合,界面间无气孔和裂纹;C-Ti-Nb-Ni60A复合涂层的显微硬度较基体16Mn钢提高近5倍,较Ni60A涂层提高0.45倍;常温干滑动200 N载荷条件下,CTi-Nb-Ni60A复合涂层的耐磨性能较基体16Mn钢提高6倍,较Ni60A涂层提高近2倍。16Mn钢表面发生严重的磨粒磨损和粘着磨损,Ni60A涂层表面以磨粒磨损为主,C-Ti-Nb-Ni60A复合涂层的磨损机理为显微檫伤磨损。Ni60A composite coating and C-Ti-Nb-Ni reinforced Ni-based composite coating were fabricated on the surface of 16Mn steel by means of argon arc cladding technique using pre-alloyed powders of Ni60A and Nb, Ti and C powders as raw materials. The microstructure, phase constituent, micro-hardness, wear properties of these two kinds of composite coatings were investigated through OM, SEM, XRD, HV2000 Micro-hardness tester and MMS-2B ring block wear test machine, and the wear mechanism was also explored. The results show that excellent metallurgy bonding is formed at the interface between the coating and substrate, there are no pores and cracks in the interface. The micro-hardness of Ti-Nb-C reinforced Ni-based coating is about 5 times higher than that of the substrate, and 0.45 time than that of Ni60A coating. At room temperature, the wear property of Ti-Nb-C reinforced Ni-based coating is 6 times higher than that of the substrate, and 2 times higher than that of Ni60A coating. Severe abrasive wear and adhesive wear occur on the surface of 16Mn steel and abrasive wear is the main wear mechanism occurred in the surface of Ni60A composite coating. The wear mechanism of Ti-Nb-C reinforced Ni-based coating is microscopic abrasions wear.

关 键 词：氩弧熔覆 复合涂层 原位合成 抗磨性能 

分 类 号：TG174[金属学及工艺—金属表面处理]