DLC和CrN薄膜在油润滑下的摩擦性能  

Tribological Properties of DLC and Cr N Films Under Engine Oil

作　　者：王顺花[1] 尚伦霖 张广安[2] 耿中荣[1] 刘千喜[3] 

机构地区：[1]兰州交通大学机电工程学院,兰州730070 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000 [3]仪征双环活塞环有限公司,仪征211400

出　　处：《宇航材料工艺》2014年第6期20-25,共6页Aerospace Materials & Technology

基　　金：国家自然科学基金(51305433;11104126);甘肃省教育厅科研项目(1204-03)

摘　　要：文摘采用闭合场非平衡直流磁控溅射技术和阴极电弧离子镀技术在轴承钢表面分别制备了DLC和Cr N薄膜,在全配方发动机油(CF-4,15W/40)润滑条件下,选择DLC/钢、Cr N/钢摩擦配副,用SRV-IV摩擦实验机考察了25℃和100℃时DLC与Cr N薄膜在不同载荷下的摩擦因数和磨损率,并对摩擦界面进行分析。结果表明:DLC和Cr N薄膜在油润滑条件下的摩擦因数都随着载荷的增加而降低;DLC和CF-4构成的固液复合润滑体系具有更加优异的摩擦学性能;活性较高的Cr N薄膜与发动机油中的添加剂相互作用,在摩擦界面上发生摩擦化学反应形成摩擦化学反应膜,并且薄膜表面形成的氧化层有利于提高薄膜在高温时的耐磨性。Diamond-like Carbon （DLC） films was deposited on the bearing steel by closed-filed unbalanced mag- netron sputter technique, and CrN films was deposited on the bearing steel by cathodic arc ion plating. The tribological performance of DLC and CrN films in the fully formulated engine oil （CF-4, 15W/40） lubrication conditions were in- vestigated on a SRV-IV tribo-meter. The effects of load and temperature on the friction coefficient and wear rate were analyzed. The results indicate that the friction coefficient of two kinds of films decreases with increasing load under oil lubrication condition. DLC solid/liquid synergistic lubrication have excellent tribological properties compared to the liq- uid lubrication. Thin tribofilm on the interface caused by the tribochemical interaction between CrN films and additives in the CF-4 engine oil decrease the friction coefficient under high load and high temperature. In addition, the wear re- sistance of the CrN films was improved as oxide layer formed on the surface at higher temperature.

关 键 词：DLC薄膜 CRN薄膜 摩擦因数 磨损率 摩擦学性能 固液复合润滑 摩擦化学反应 

分 类 号：TG17[金属学及工艺—金属表面处理]