NiCr过渡层对高速火焰喷涂WC-Co涂层摩擦磨损性能及疲劳磨损性能的影响  

Friction and Wear Properties and Fatigue Wear Properties of HVOF WC-12Co Coating

作　　者：杨康 辛越 姜自滔 倪振航 王硕煜 张世宏[2] Yang Kang;Xin Yue;Jiang Zitao;Ni Zhenhang;Wang Shuoyu;Zhang Shihong(Anhui Ma Steel Surface Technology Co.,Ltd.Ma'anshan 243000,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education),Anhui University of Technology,Ma'anshan 243002,China)

机构地区：[1]安徽马钢表面技术股份有限公司,马鞍山243000 [2]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,马鞍山243002

出　　处：《热喷涂技术》2023年第3期54-67,98,共15页Thermal Spray Technology

摘　　要：WC-Co涂层作为一种性能优异的涂层,逐渐被应用于轧辊的表面防护,目前大量实验研究的有热喷涂、激光熔覆制备WC-Co涂层。本文提出用高速火焰喷涂(HVOF)在常用轧辊材料Q235钢表面制备WC-Co涂层,同时在WC-Co涂层和基体之间加入NiCr过渡层。利用SEM、XRD、摩擦磨损测试、疲劳磨损测试等测试方法,对涂层形貌结构以及各项性能与无过渡层涂层进行对比研究。结果表明,加入NiCr过渡层后,WC-12Co+NiCr、WC-10Co-4Cr+NiCr涂层硬度分别为1059.64 HV_(0.3)、1016.96 HV_(0.3),比WC-12Co涂层(960.01 HV_(0.3))、WC-10Co-4Cr涂层(1012.20 HV_(0.3))更高。WC-12Co+NiCr涂层的磨损率(5.19×10^(-15)m^(3)·(N·m)^(-1))远低于WC-12Co涂层(6.59×10^(-15)m^(3)·(N·m)^(-1)),WC-12Co涂层在疲劳磨损中的磨损量2644.58×10^(-12)m^(3)减少到WC-12Co+NiCr涂层的1193.20×10^(-12)m^(3)。WC-Co coating has been gradually applied to the surface protection of rolls.At present,a large number of experiments have been conducted to prepare WC-Co coating by thermal spraying,laser cladding and surfacing welding.In this paper,the high-velocity oxygen fuel spray(HVOF)is used to prepare WC-Co coating on the surface of Q235 steel,and the NiCr transition layer is added between the WC-Co coating and the substrate.The testing methods are adopted by SEM,XRD,friction and wear testing,fatigue and wear testing,etc.The morphology,structure and properties of the coating were compared with those of the coating without transition layer.After adding NiCr transition layer,the hardness of WC-12Co+NiCr and WC-10Co-4Cr+NiCr coatings are 1059.64 HV_(0.3)and 1016.96 HV_(0.3),respectively.There are higher than WC-12Co(960.01 HV_(0.3))and WC-10Co-4Cr coatings(1012.20 HV_(0.3)).The wear rate of WC-12Co+NiCr coating(5.19×10^(-15)m^(3)·(N·m)^(-1))is much lower than that of WC-12Co coating(6.59×10^(-15)m^(3)·(N·m)^(-1)).The wear volume of WC-12Co coating in fatigue wear is reduced from 2644.58×10^(-12)m^(3)to 1193.20×10^(-12)m^(3)of WC-12Co+NiCr coating.

关 键 词：高速火焰喷涂 WC-CO涂层 NiCr过渡层 摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]