锆合金表面MoS_(2)基粘结固体润滑涂层的润滑及失效机理研究  

Lubrication and Failure Mechanism of MoS_(2)-based Bonded Solid Lubricating Coatings on Zirconium Alloy Surface

作　　者：高原 王一童 王庆娟[1] 王伟[1] 王岩 王强[1] GAO Yuan;WANG Yitong;WANG Qingjuan;WANG Wei;WANG Yan;WANG Qiang(School of Metallurgy Engineering,Xi an University of Architecture and Technology,Xi an 710055,China;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《中国材料进展》2021年第11期911-916,共6页Materials China

基　　金：国家重点研发计划项目(2017YFB0306202);清华大学摩擦学国家重点实验室开放基金资助项目(SKLTKF19B10)。

摘　　要：锆合金挤压作为核燃料元件生产的关键工艺,面临传统润滑方式难以满足要求的问题,需要对挤压润滑剂的润滑性能和失效形式进行系统性研究。在锆合金表面制备了耐高温MoS_(2)基粘结固体润滑涂层,用高温球-盘试验机模拟研究了涂层在热挤压试验时的润滑性能,用扫描电镜和三维光学数码显微镜分析了涂层摩擦后的表面形貌以及磨痕表面和截面形貌,用能谱仪分析了高温下涂层中粘结剂及润滑颗粒成分的变化,用拉曼光谱分析了磨痕处涂层成分的变化。涂层在400和600℃短时保温(10 min)后摩擦表现出优良的润滑性能,其摩擦系数均在0.05左右,这归因于MoS_(2)在高温条件下依旧保持优良的层状结构,在高温强载荷下基本未发生摩擦化学现象;但是在600℃保温60 min后,涂层内MoS_(2)由于长时间保温而氧化失效,润滑性能大幅度降低。根据MoS_(2)基粘结固体润滑剂不同使用温度及保温时间,探究以MoS_(2)为主要润滑成分的润滑剂在高温强载荷条件下的润滑性能及失效形式,为MoS_(2)基粘结固体润滑涂层在金属塑性加工领域的应用提供了理论依据。Zirconium alloy extrusion is the key process for producing nuclear fuel components,and traditional lubrication methods already can t meet the process and property request.Therefore,systematic research on the lubricating properties and failure modes of extrusion lubricants is needed.In this work,the heat-resistant MoS_(2)-based bonded solid lubricating coating was prepared on the surface of zirconium alloy.Lubricating properties of the coating under hot extrusion conditions were studied by high-temperature ball-on-disk tribological tester.Surface morphology and microstructure of the coatings and wear tracks were analyzed by SEM and 3D optical digital microscope,the change of binder and lubricant particles in the coating at high temperatures was analyzed by EDS,the change of the coating composition at the wear tracks was analyzed by Raman spectroscopy.The coating has excellent lubricating property at high-temperature tribological test after holding at 400 and 600℃for 10 min,and its friction coefficient is all about 0.05.This is attributed to the fact that MoS_(2) still maintains an excellent layered structure at high temperatures,and there is no friction chemical phenomenon under high temperature and strong load.However,after holding at 600℃for 60 min,MoS_(2) is oxidized and failed because of a long time heat preservation,the lubrication property is greatly reduced.In this work,considering heating temperature and holding time of the extrusion process,the lubricating properties and failure modes of MoS_(2)-based bonded solid lubricants under high temperature and strong load condition were investigated,which may provide theoretical basis for metal forming.

关 键 词：MoS_(2) 粘结固体润滑涂层 润滑性能 磨损机制 高温摩擦 

分 类 号：TG174.44[金属学及工艺—金属表面处理]