Tribological properties of Al-GNP composites at elevated temperature  

作　　者：Sunil POUDEL Rizwan BAJWA Yongde XIA Zakir KHAN Yi ZHANG Yanqiu ZHU 

机构地区：[1]College of Engineering,Mathematics and Physical Sciences,University of Exeter,Exeter,EX44QF,UK [2]European Technical Centre,Daido Metal Co.,Ltd.,Iliminster Somerset,TA199PH,UK

出　　处：《Friction》2024年第5期1028-1041,共14页摩擦（英文版）

基　　金：supported by the“The Royal Society”(INF\PHD\180005).

摘　　要：Lighter and more powerful next generation vehicles and other rotary machinery demand bearings to operate in harsher conditions for higher efficiency,and the continuous development of advanced low-wear and friction materials is thus becoming even more important to meet these requirements.New aluminium composites reinforced with high performance lubricate phases such as graphene nanoplatelets(GNPs)are very promising and have been vigorously investigated.By maintaining a low coefficient of friction(COF)and offering great strength against wear due to their self-lubricating capability,the solid lubricant like GNPs protect the bearing surface from wear damage and prevent change in metallurgical properties during temperature fluctuations.This paper first studies the high-temperature tribological performance of aluminium matrix composites reinforced with GNP,consolidated via powder metallurgy,then elucidates their tribological mechanism.We report that the best tribological performance is achieved by the composite containing 2.0 wt%GNP,with an extraordinarily low COF of 0.09 and a specific wear rate of 3.5×10^(−2)mm^(3)·N^(−1)·m^(−1),which represent 75%and 40%reduction respectively,against the plain aluminium consolidated under identical conditions.The in-track and out-of-track Raman analysis have confirmed the role of GNPs in creating a tribofilm on the counterpart surface which contributed to the excellent performance.

关 键 词：NANOCOMPOSITE graphene nanoplatelet(GNP) TRIBOLOGY powder metallurgy 

分 类 号：TB333[一般工业技术—材料科学与工程]