低速重载下GCr15表面超声振动复合电火花沉积WC涂层的摩擦磨损性能  

Friction and Wear Performance of Ultrasonic Vibration Composite Electro-spark Deposition WC Coatings on GCr15 Surface with Heavy Load at Low Speed

作　　者：李碧晗 王彦民 马小斌[1,2] 汪瑞军 LI Bihan;WANG Yanmin;MA Xiaobin;WANG Ruijun(Chinese Academy of Agricultural Mechanization Sciences Group Co.,Ltd.,Beijing 100083,China;State Key Laboratory of Agricultural Equipment Technology,Beijing 100083,China;Shijiazhuang Zhongxing Machinery Manufacture Co.,Ltd.,Shijiazhuang 051530,China)

机构地区：[1]中国农业机械化科学研究院集团有限公司,北京100083 [2]农业装备技术全国重点实验室,北京100083 [3]石家庄中兴机械制造股份有限公司,石家庄051530

出　　处：《农业机械学报》2024年第S1期420-426,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：中国机械工业集团有限公司青年科技基金项目(QNJJ-PY-2022-15)

摘　　要：为提高农业机械车轮模具在低速重载作业环境下的摩擦磨损性能,以农业机械车轮模具使用的GCr15为研究对象,采用电火花沉积技术和超声振动复合电火花沉积技术分别在GCr15基体上制备了WC涂层。采用显微硬度计、表面粗糙度仪、摩擦磨损试验机以及三维白光干涉轮廓仪等设备对WC涂层的显微硬度、表面粗糙度、摩擦磨损性能等进行了分析测试。研究结果表明,超声振动复合WC涂层表面粗糙度为4.641μm,相比于电火花沉积WC涂层降低约62%,显微硬度为1114.6 HV_(0.025),相比于电火花沉积WC涂层提高约15%,相比于基材提高约67%。摩擦磨损试验结果表明,超声振动复合WC涂层和电火花沉积WC涂层的平均摩擦因数和磨损量均低于基材,这表明制备WC涂层可有效提高模具的减摩耐磨性。超声振动复合WC涂层的平均摩擦因数、磨损量以及磨痕深度均低于电火花沉积WC涂层,这表明在低速重载条件下超声振动复合WC涂层具有最优异的减摩耐磨性能。试样磨损量与其显微硬度成负相关,与平均摩擦因数和涂层表面粗糙度成正相关。In order to improve the friction and wear performance of agricultural machinery wheel molds in low-speed and heavy-load operating environments,WC coatings were prepared on GCr15 substrates by using electro-spark deposition technology and ultrasonic vibration composite electrospark deposition technology,respectively,with GCr15 used in agricultural machinery wheel molds as the object of study.The microhardness,surface roughness,friction and wear performance of the WC coatings were analyzed and tested by using microhardness tester,surface roughness tester,friction and wear tester and three-dimensional white light interference profiler.The results showed that the surface roughness of the ultrasonic vibration composite WC coating was 4.641μm,which was lower than that of the electro-spark deposition WC coating by about 62%.The microhardness was 1114.6 HV_(0.025),which was improved by about 15%compared with that of the electro-spark deposition WC coating,and improved by about 67%compared with that of the substrate.The results of the friction and wear test showed that the average coefficient of friction and the wear of the ultrasonic vibration composite WC coating and the electro-spark deposition WC coating were lower than that of the substrate,which indicated that the preparation of the WC coating can effectively improve the friction reduction and wear resistance of the mold.The average coefficient of friction,wear amount and depth of abrasion of the ultrasonic vibration composite WC coating were lower than that of the electro-spark deposition WC coating,which indicated that the ultrasonic vibration composite WC coating had the best friction and abrasion resistance under the condition of heavy load and low speed.The wear amount of the specimen was in a negative correlation with its microhardness,and in a positive correlation with the average coefficient of friction and coating surface roughness.

关 键 词：超声振动复合电火花沉积 WC涂层 低速重载 摩擦磨损性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]