Tribological behaviors of spot-textured TiN coatings on M2 high-speed steel under boundary lubricated conditions

Guangneng Dong1), Meng Hua2), Jian Li3), Hing-Yin Ma2), and Youbai Xie1) 1) Lubrication Theory and Bearing Institute, Key Laboratory of the Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jioatong University, Xi’an 710049, China 2) Department of Manufacturing Engineering and Engineering Management, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, China 3) Wuhan Research Institute of Materials Protection, Wuhan 430030, China

摘 要：The effect of sliding duration on the tribological behaviors of spot patterned coatings was investigated. Two patterns based on physical vapor deposition （PVD） TiN coatings were used, such as, in-lined （IN） and staggered （ST） spots. The tribological behaviors were evaluated by using a Cameron-Plint wear test rig. The M2 steel discs deposited TiN coatings with IN and ST patterns slid against the ASSAB 17 tool steel pins at a speed of 0.23 m/s, in Shell Tellus T32 lubricant and were loaded with 900 N. The testing results on disc specimens with two types of PVD TiN spot patterns, all coated with a bias voltage of ?180 V and slid for 4, 8 and 11 h respectively, were presented. The results revealed that the in-lined coatings possessed relatively better wear behaviors than the staggered pattern coatings. Mechanisms for such superiority and for the cause of peeling were discussed. A relevant design approach was suggested for the application of such patterned coatings.

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