CrN和CrN/Ag涂层的真空高温摩擦磨损性能  

Tribological Behavior of CrN and CrN/Ag Coatings at High Temperatures in Vacuum

作　　者：蔡群 蒲吉斌 CAI Qun;PU Jibin(Key Laboratory of Marine Materials and Related Technologies,Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province,Ningbo Institute of Materials Technology and Engineering,Ningbo Zhejiang 315201,China;Faculty of Mechanical Engineering&Mechanics,Ningbo University,Ningbo Zhejiang 315211,China)

机构地区：[1]中国科学院宁波材料技术与工程研究所,中国科学院海洋新材料与应用技术重点实验室,浙江省海洋新材料与防护技术重点实验室,浙江宁波315201 [2]宁波大学机械工程与力学学院,浙江宁波31521

出　　处：《润滑与密封》2021年第12期19-29,共11页Lubrication Engineering

基　　金：国家自然科学基金项目(51675287);浙江省自然科学基金项目(LZ17E050004)。

摘　　要：为改善涂层在真空、高温等苛刻条件下的摩擦学性能,利用中频直流磁控溅射技术在硅片和316L不锈钢上沉积了CrN和CrN/Ag涂层,利用扫描电镜、透射电镜和X射线衍射仪对涂层的成分及相结构进行了表征,通过划痕测试仪、纳米压痕仪和摩擦磨损试验机测试了涂层的力学及摩擦学性能。结果表明:添加Ag元素以后,CrN/Ag涂层硬度及承载能力有所减小,但结合强度增加;真空高温环境下CrN与CrN/Ag涂层摩擦因数随温度升高呈下降趋势,其中CrN涂层通过软化镀层减小剪切强度和阻力,从而减小摩擦因数,CrN/Ag涂层主要通过高温产生的热驱动力诱导表面Ag润滑膜的形成来减小摩擦因数;CrN涂层依靠自身剪切特性参与摩擦,而CrN/Ag涂层在真空高温下具有自润滑和持续润滑性能,作为自润滑零部件具有潜在的应用价值。In order to improve the tribological properties of the coating in vacuum or high temperature,CrN and CrN/Ag coatings were deposited on stainless steel substrates by medium frequency DC magnetron sputtering system.A variety of technologies were employed to characterize the composition and structure of the coatings,including scanning electron microcopies,transmission electron microscope,X-ray diffraction.The mechanical properties and friction behaviors of as-deposited coatings were investigated by scratch tester,nanoindentation tester and friction and wear tester.The results show that the hardness and load-carrying capacity of CrN/Ag coatings decrease with the addition of Ag,but the bonding strength increases.The friction coefficient of CrN and CrN/Ag coatings decreases with increasing temperature at high temperature in vacuum.CrN coating depends on reducing shear strength and resistance by softening the coating during sliding,thereby reducing the friction coefficient.However,CrN/Ag coating can form Ag lubricating film on the friction surface induced by thermal driving force produced at high temperature,thereby reducing the friction coefficient.CrN coating participates in friction process relying on their shear properties,while CrN/Ag coatings are able to keep self-lubrication and sustained lubrication at high temperature in vacuum,indicating their potential application as a self-lubricating coating for tribo-components.

关 键 词：CRN涂层 CrN/Ag涂层 力学性能 摩擦磨损 自润滑性能 

分 类 号：TG174.444[金属学及工艺—金属表面处理]