Preparation And Tribological Properties Of 20CrMnTi-SnAgCu-Graphene Self-Lubricating Composites

In the field of machinery,machinery usually fails due to the friction and wear of some parts during use,resulting in huge losses.In order to solve this problem,the form of lubrication of mechanical parts has become a problem that people pay more and more attention to.The excellent performance of metal-based self-lubricating materials in complex working conditions has led us to find a direction that can solve this problem well.The composite material formed by adding one or more solid lubricants to the metal matrix is a metal matrix.Base solid self-lubricating material.This material has excellent properties because this new composite material exhibits the advantages of solid lubricants while embodying the properties of the matrix material.The main research content of this subject can be divided into four parts.(1)The composition design of 20 Cr Mn Ti-Sn Ag Cu-Graphene self-lubricating material was explored,and it was prepared by spark plasma sintering process.At the same time,the micro-morphology and element composition of the self-lubricating material were analyzed,and its basic performance characterization was tested.The research shows that the composition ratio of graphene is 5wt.% is reasonable,and the 20 Cr Mn Ti-Sn Ag Cu-Graphene self-lubricating material prepared by spark plasma sintering process has a dense structure and good effect.(2)To explore the effect of different contents of graphene and different working conditions on the tribological properties of the material,the friction and wear tests were carried out on the samples under the loads of 10 N,15 N and 20 N respectively,and the tribological properties of the samples were tested under the same load respectively.performance.The test results show that adding 5% graphene to the 20 Cr Mn Ti-Sn Ag Cu-Graphene self-lubricating material has better lubricating performance.Combined with the FESEM microstructure of the wear scar section of the material,the effect of applied load on the formation of the lubricating film and the tribological properties of the material was explored.The analysis found that the lubricating film thickened as the applied load increased from 10 N to 15 N,From 15 N to 20 N,the lubricating film and the friction coefficient of the material tend to be stable,indicating that the applied load is the influencing factor for the formation of the lubricating film and the tribological properties of the material.(3)To explore the mechanism of the influence of the increase of the thickness of the lubricating film on the tribological properties of the material,based on the ANSYS finite element analysis software to set different thicknesses of the lubricating film,the mechanical model of the 20 Cr Mn Ti-Sn Ag Cu-Graphene self-lubricating material was established,and the mechanical model of the self-lubricating material of the lubricating film and the matrix material was established.Equivalent stress analysis.The calculation results show that with the thickening of the friction lubricating film,the shear stress of the matrix material is lower,indicating that the formation of the friction lubricating film has a good protective effect on the material.Through the above methods to study the factors affecting the tribological properties of20 Cr Mn Ti-based self-lubricating materials,to explore ways to reduce gear wear and prolong the service life of gears,and to broaden the research path of self-lubricating composite materials,it has broad application prospects and market value.considerable economic benefits.