Study on the tribological properties of metal rolling bearing under lubrication with diketone lubricants  

作　　者：DU ShaoNan ZHANG ChenHui LUO Zhi 

机构地区：[1]State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China [2]Beijing National Laboratory of Molecular Sciences,CAS Key Laboratory of Engineering Plastics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Technological Sciences)》2024年第7期2003-2017,共15页中国科学（技术科学英文版）

基　　金：supported by the National Key R&D Program of China (Grant No. 2020YFA0711003);the National Natural Science Foundation of China (Grant No. 51925506);the National Natural Science Foundation of China Youth Science Foundation (Grant No. 52305178)。

摘　　要：In this article, 1-(4-ethylphenyl)-nonane-1,3-dione(0206) was prepared by Claisen condensation. By mixing 0206, chelate, and base oil in a ratio of 3.2:4.8:2, a diketone lubricant(PAO=14(20%)) that can achieve superlubricity was prepared and applied to bearing lubrication experiments. The experimental results show that when the bearing was lubricated by base oil, the friction coefficient(COF) and temperature rise decreased with the decrease of the viscosity of PAO. When PAO=14(20%) was used as the lubricant, the COF of the bearing was the lowest(0.001), and the wear morphology was comparable to that of the bearing lubricated with commercial lubricant. Compared with the base oil with the same viscosity, it is found that the COF and temperature rise of the bearing lubricated by PAO=14(20%) were lower under any experimental conditions. And when the amount of lubricant added was 10 μL, the COF of the bearing lubricated by PAO=14(20%) reached a very low value(0.0004).Bearing ball surface analysis identified the formation of diketone adsorption films. Combined with the previous PAO=14(20%)superlubricity mechanism, it was considered that the occurrence of tribochemical reaction and the bearing effect of chelates were the main reasons for the existence of ultra-low friction coefficient and low wear. In addition, when there were polar molecules in the lubricant, they were adsorbed on the metal surface through tribochemical reactions, resulting in many irregular pits on the surface.

关 键 词：SUPERLUBRICITY DIKETONE CHELATE tribochemical recations bearing lubrication 

分 类 号：TH133.33[机械工程—机械制造及自动化] TH117