Abstract:
In response to the problem of sudden failure in the high-temperature lubrication performance of lubricating oil, in order to achieve continuous lubrication of lubricating materials within a certain temperature range, a study on the design method of adaptive lubrication additives for sudden changes in operating conditions is carried out. This study prepared a series of silver pyrazole methyl pyridine complexes with the same lubrication mechanism but different physicochemical properties that decompose and release silver particles at high temperatures. A lubricating oil additive ratio strategy suitable for real-time lubrication was designed. The friction and wear resistance of composite lubricating oil additives containing silver complexes were studied using a four ball friction and wear tester. The research results showed that compared with lubricating oil additives containing only a single complex, The formulated lubricating oil has better stability and can continuously decompose and transport silver particles at different temperatures, ensuring continuous low friction of the contact surface over a wide temperature range, with better self-healing ability and lubrication performance. Through various characterization methods to analyze the wear mechanism of the experimental results, it was found that under the influence of the layered structure of complex 1 and the small size effect of complex 2, the negative impact of complex 3 on the wear of the contact surface during the friction process can be effectively suppressed. Therefore, there is a good synergistic effect of wear resistance between complex 3 and complexes 1, 2. However, compared to lubricants containing only a single complex 1, 2, the expected lubrication effect between complexes 1 and 2 did not occur due to the influence of van der Waals forces. Based on the thermogravimetric analysis results of a series of silver containing complexes, the formula equation of silver containing series complexes was derived by fitting the relationship curve between the friction coefficient and temperature of composite lubricant additives, and the empirical formula was modified by Matlab. It was found that the appropriate ratio and addition amount were the key factors affecting the anti-wear and antifriction performance of lubricant additives. The optimal ratio of composite lubricant additives was determined to be 1.0:1.0:0.5, We have mastered the decomposition efficiency of the complex in lubricating oil after being proportioned during the continuous heating process, further proving that the silver release efficiency of the proportioned lubricating oil increases, making it more suitable as a backup lubricating oil additive under sudden operating conditions. The research results can provide data support and theoretical guidance for the subsequent design of lubricating effect control methods of lubricant release materials.