High temperature lubrication performance of chlorophenyl silicone oil  

作　　者：Yan MENG Xiangli WEN Jie CHENG Pengpeng BAI Yonggang MENG Yu TIAN 

机构地区：[1]School of Mechanical and Electrical Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China [2]Department of Mechanical Engineering,State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China

出　　处：《Friction》2024年第8期1716-1727,共12页摩擦（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52275198,52075037,51805292);Fundamental Research Funds for the Central Universities(Nos.2021XJJD01);Beijing Natural Science Foundation(No.22C10149,2202020);Tribology Science Fund of State Key Laboratory of Tribology(Nos.SKLTKF21A01,SKLT2022B11).

摘　　要：Most studies of liquid lubricants were carried out at temperatures below 200°C.However,the service temperature of lubricants for aerospace and aeroengine has reached above 300°C.In order to investigate the friction mechanism and provide data for high temperature lubrication,the friction and wear properties of chlorophenyl silicone oil(CPSO)-lubricated M50 steel and Si3N4 friction pairs were investigated herein.Ball-on-disk experimental results show that the lubrication performance of CPSO varies significantly with temperature.Below 150°C,coefficient of friction(COF)remains at 0.13–0.15 after the short running-in stage(600 s),while the COF in the running-in stage is 0.2–0.3.At 200°C and above,the running-in time is much longer(1,200 s),and the initial instantaneous maximum COF can reach 0.5.Under this condition,the COF gradually decreases and finally stabilizes at around 0.16–0.17 afterwards.This phenomenon is mainly due to the different thickness of boundary adsorption film.More importantly,the wear rate of M50 steel increases significantly with the temperature,while the wear rate barely changes at temperatures above 200°C.The anti-wear mechanism is explained as tribochemical reactions are more likely to occur between CPSO and steel surface with the increased temperature,generating the FeCl2 protective film on the metal surface.Accordingly,FeCl2 tribochemical film improves the lubrication and anti-wear capacity of the system.At high temperatures(200–350°C),FeCl2 film becomes thicker,and the contact region pressure becomes lower due to the larger wear scar size,so the wear rate growth of M50 steel is much smaller compared with that of low temperatures(22–150°C).The main findings in this study demonstrate that CPSO lubricant has good anti-wear and lubrication capacity,which is capable of working under temperatures up to 350°C.

关 键 词：chlorophenyl silicone oil(CPSO) liquid lubricant ANTI-WEAR high temperature 

分 类 号：TH117[机械工程—机械设计及理论]