速度和载荷对脂润滑2Cr13钢离子渗氮层摩擦学行为的影响  

The Effect of Velocity and Load on the Tribological Behavior of the Plasma-nitrided Layer on 2Cr13 Steel under Grease-lubricated Conditions in Vacuum

作　　者：杨剑群[1,2] 刘勇[1] 李兴冀[1] 王黎钦[2] 叶铸玉[1] 杨德庄[1] 何世禹[1] 

机构地区：[1]哈尔滨工业大学空间环境材料行为及评价技术重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001

出　　处：《摩擦学学报》2013年第1期70-77,共8页Tribology

基　　金：国家973计划项目(2013CB632305);博士后科学基金(2012M520733)资助~~

摘　　要：利用销-盘式摩擦磨损试验机对不同速度和载荷条件下PFPE脂润滑2Cr13钢离子渗氮层进行了系统的真空滑动摩擦磨损试验.采用扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)和傅里叶变换红外光谱(FTIR)分别对磨损表面的形貌、化学状态及润滑脂的成分进行分析.结果表明:随着载荷和滑动速度的增加,脂润滑渗氮层的磨损机制由轻微磨损向轻微复合磨损机制转变.在真空摩擦磨损过程中2Cr13钢离子渗氮层与PFPE润滑脂发生化学反应,并有FeF3生成,促进PFPE润滑脂发生降解,形成酸性的氟化物.增加载荷和速度会加速渗氮层与润滑脂之间的反应,进一步促进润滑脂的降解.The friction and wear tests of the plasma - nitrided layer on a 2Cr13 steel under perfluoropolyether （PFPE） type grease -lubricated condition in vacuum were conducted on a pin - on - disk tribometer. The morphologies of the worn surfaces were observed by using scanning electron microscopy. The chemical states of typical elements on the worn surfaces were examined by means of X - ray photoelectron spectroscopy. The chemical compositions of grease before and after friction tests were analyzed by using fourier transform infrared spectroscopy. Experimental results show that under grease - lubricated condition, a transition of wear mechanisms from a mild wear to a mixed mild wear with increasing the normal load and the sliding velocity was observed. Tribochemical reactions between the nitrided layer and PFPE grease during sliding in vacuum gave birth to the product of FeF3. FeF3 can be a catalyst to promote the degradation of PFPE grease to release acid fluorides. Increasing the normal load and the sliding velocity would accelerate the reactions between the nitrided layer and grease, and further promote the degradation of grease.

关 键 词：渗氮层 PFPE润滑脂 真空环境 磨损机制 

分 类 号：TH117.1[机械工程—机械设计及理论]