Tribological properties of nano-BN/TiN lubricating additives modified with oleic acid
MENG Fan-shan1, LI Zheng2, DING Hao-hao1, WANG Wen-jian1, LIU Qi-yue1
1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Department of Mechanical and Electrical Engineering, Qingdao University of Technology(Linyi), Linyi 273400, Shandong, China
Abstract：BN, TiN and BN/TiN nano-additives were modified by oleic acid, characterized by Fourier transform infrared spectroscopy. The tribological properties of lubricating oil nano-additives were tested by four-ball friction and wear tester. The results show that oleic acid is grafted onto the surface of nanoparticles to improve their dispersibility. Compared with pure base oil, lubricating oil with nano-additives reduces friction coefficient by 11.7% and wear scar diameter by 29.5%, respectively. No peeling and falling off appears on the surface of wear scar, and the depth and width of groove are obviously reduced, compared with single nano-additive BN or TiN, BN/TiN displays synergistic lubrication when mixed nano-additive BN/TiN is used. The nano-BN and TiN particles can enter the friction pair, play the role of micro-bearing, reduce friction and wear. The nano-BN entering the friction pair and reacting with the matrix material of the friction pair can form boron nitride, boron oxide and iron oxide to repair the wear surface.
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