摘要
采用粉末冶金法制备了含镀铜MoS_(2)和不镀铜MoS_(2)两种青铜-石墨-MoS_(2)自润滑材料,并在4 N和10 N载荷下分别进行摩擦磨损实验,研究MoS_(2)表面镀铜对材料摩擦性能的影响。研究结果表明,在MoS_(2)表面镀铜可以增强MoS_(2)与基体的结合性,同时抑制材料中硬质相MoO_(2)的形成。此外,两种材料在摩擦过程中均在表面形成了一层MoS_(2)润滑膜,但是在MoS_(2)表面镀铜后形成的润滑膜更厚,并且具有凹凸不平的形貌,更有利于改善材料的摩擦性能。与常规材料相比,在4 N和10 N载荷下进行滑动摩擦时,镀铜材料的磨损率均降低了一个数量级,摩擦因数也分别降低了22.44%和22.53%,表明在MoS_(2)表面镀铜可以进一步改善青铜-石墨-MoS_(2)自润滑材料的摩擦性能。
Two kinds of bronze-graphite-MoS_(2) self-lubricating materials with copper-coated MoS_(2) and uncoated MoS_(2) were prepared by powder metallurgy.Friction and wear experiments were carried out under 4 N and 10 N loads respectively,and the effects of copper-coated MoS_(2) on the friction performances of the materials were studied.Results showed that the way of copper-coated on the surface of MoS_(2) could reinforce the bonding between MoS_(2) and matrix,and inhibited the formation of MoO_(2).Moreover,both materials formed a MoS_(2) lubricating film on the surface during the friction process.While the lubricating film formed after copper coating on MoS_(2) was thicker and had uneven morphology,it was more conducive to improving the friction performance of the material.Compared with conventional materials,the wear rate of copper-coated materials was reduced by one order of magnitude,and the friction coefficient was also reduced by 22.44% and 22.53%,respectively,when sliding under 4 N and 10 N loads.It shows that copper-coated MoS_(2)can improve friction properties of bronze-graphite-MoS_(2)self-lubricating materials furtherly.
作者
王慧灵
姜锋
童蒙蒙
吴明锦
蒋靖宇
WANG Hui-ling;JIANG Feng;TONG Meng-meng;WU Ming-jin;JIANG Jing-yu(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Light Alloy Research Institute,Central South University,Changsha 410083,China;The National Key Laboratory of Science and Technology for National Defence on High-Strength Lightweight Structural Materials,Central South University,Changsha 410083,China)
