高温热效应对复合锂基润滑脂性能影响规律研究

作者在本文中主要研究了热效应对复合锂基润滑脂基础脂以及含有二烷基二硫代磷酸锌(ZDDP)的复合锂基润滑脂微观结构、润滑性能以及流变学性能的影响规律. 复合锂基润滑脂经120和150 ℃恒温热处理24 h后，对其外观、红外光谱、边界润滑性能、弹流润滑性能和流变学性能进行了测试. 研究结果表明：120 ℃热处理对复合锂基润滑脂性能影响较小，但基础脂以及含有抗磨添加剂的润滑脂在经历150 ℃热处理后，增稠剂纤维结构变得更为松散，发生明显断裂、网状结构严重破坏，在150 ℃下含有添加剂的复合锂润滑脂的结构强度和触变性明显变差. 上述研究表明，高温条件下的热效应对润滑脂微观结构破坏更大，更容易造成润滑脂性能的显著变化.This paper mainly investigates the influence of thermal effects on the microstructure, lubricating properties and rheological properties of neat composite lithium-based grease and composite lithium-based grease containing zinc dialkyldithiophosphate (ZDDP). After undergoing isothermal heat treatment at 120 ℃ and 150 ℃ for 24 hours, tests were performed on the appearance, Fourier transform infrared (FTIR) spectroscopy, boundary lubrication performance, elastohydrodynamic lubrication (EHL) performance and rheological properties of the grease samples. The research results demonstrate that: heat treatment at 120 ℃ exerts negligible effects on the performance of composite lithium-based grease. However, after heat treatment at 150 ℃, the thickener fiber structure of both the neat composite lithium-based grease and the grease with anti-wear additives becomes more loose, with obvious breakage and severe damage to the network structure; the structural strength and thixotropy of the ZDDP-containing composite lithium-based grease deteriorate significantly at 150 ℃. The above findings indicate that thermal effects under high-temperature conditions cause greater damage to the microstructure of lubricating greases, and are more prone to inducing significant changes in the performance of lubricating greases.

搜集汇总

背景与挑战

背景概述

该数据集研究了高温热效应对复合锂基润滑脂性能的影响，重点关注120℃和150℃热处理24小时后对微观结构、润滑性能和流变学性能的变化。结果表明，120℃热处理影响较小，而150℃热处理会导致增稠剂纤维结构严重破坏，特别是含添加剂的润滑脂结构强度和触变性显著下降，揭示了高温对润滑脂性能的负面影响规律。