WC-10Co4Cr涂层的高载荷摩擦磨损性能及耐腐蚀性能研究  

Research on Friction and Wear Properties under High Loading Force and Corrosion Resistance of WC-10Co4Cr Coatings

作　　者：李旭勇 徐雪源 李琼 廖可 严伟 杨学兵 张林伟[2] LI Xu-yong;XU Xue-yuan;LI Qiong;LIAO Ke;YAN Wei;YANG Xue-bing;ZHANG Lin-wei(Jiangxi Hongdu Aviation Industry Group Company,Ltd.,Nanchang 330096,China;Institute of Applied Physics,Jiangxi Academy of Science,Nanchang 330096,China)

机构地区：[1]江西洪都航空工业集团有限责任公司,江西南昌330096 [2]江西省科学院应用物理研究所,江西南昌330096

出　　处：《稀有金属与硬质合金》2025年第1期47-55,共9页Rare Metals and Cemented Carbides

基　　金：江西省科学院横向项目(J1-KJ-300-2022-KY0556-0128)。

摘　　要：使用WC粒径为1μm和0.5μm的喷涂粉末制备了两种WC-10Co4Cr涂层,通过分析涂层的金相结构、摩擦系数、磨痕形貌和动电位极化曲线等,研究了涂层在1000 N高载荷下的摩擦磨损性能及在不同质量分数的氯化钠溶液中的耐腐蚀性能。结果表明:WC粒径较小的喷涂粉末制备的涂层致密度、显微硬度和断裂韧性均高于WC粒径较大的涂层。两种涂层在150 N载荷下的磨痕浅,且磨损体积差异小,难以比较其耐磨损性能。在1000 N载荷下WC粒径较小的涂层的耐磨损性能明显较高,且随着摩擦时间增加,涂层表面的摩擦系数逐渐减小,其磨损机理主要为磨粒磨损;而WC粒径较大的涂层摩擦系数随着摩擦时间增加而升高,表面的磨损机理包括粘着磨损和磨粒磨损。当溶液中氯化钠质量分数从1%增大到10%时,WC粒径较小的涂层的腐蚀电位高于WC粒径较大的涂层,前者的耐腐蚀性能更优异。当氯化钠质量分数为3.5%时,两种涂层的腐蚀电位差值最大,其耐腐蚀性能差异最明显。Spraying powders with WC particle sizes of 1μm and 0.5μm were used to prepare two kinds of WC-10Co4Cr coatings.By means of testing metallographic microstructure,friction coefficient,wear scar morphology and potentiodynamic polarization curves of WC-10Co4Cr coatings,friction and wear properties of the coatings under high loading force of 1000 N were studied,and corrosion resistance of the coatings in sodium chloride solution with different mass fractions was investigated.The results indicate that compactness,microhardness and fracture toughness of the coating prepared by spraying powder with smaller WC particle size are all higher than those of the coating with larger WC particle size.When loading force is 150 N,wear scars of these two coatings are shallow and their difference in wear volume is small,so it is hard to compare their wear resistance.Under loading force of 1000 N,wear resistance of the coating with smaller WC particle size is obviously higher.With the increase of friction time,the friction coefficient of the coating surface gradually decreases,and the wear mechanism is mainly abrasive wear.The friction coefficient of the coating with larger WC particle size increases with friction time,and the wear mechanism of the surface includes adhesive wear and abrasive wear.As mass fraction of sodium chloride in solution increases from 1%to 10%,corrosion potential of the coating with smaller WC particle size is higher than that of the coating with larger WC particle size,and the corrosion resistance of the former coating is better.When the mass fraction of sodium chloride is 3.5%,difference in corrosion potential between these two coatings is highest,and the distinction in corrosion resistance is most apparent.

关 键 词：WC-10Co4Cr涂层 高载荷 摩擦系数 摩擦磨损性能 耐腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]