Preparation and friction properties of bronze-graphite-MoS2 self-lubricating materials
WANG Huiling1, JIANG Feng1,2,3, TONG Mengmeng1, WU Mingjin2, YE Pengcheng1
1. School of Material Science and Engineering, Central South University, Changsha 410083, China; 2. Light Alloy Research Institute, Central South University, Changsha 410083, China; 3. The National Key Laboratory of Science and Technology for National Defence on High-Strength Lightweight Structural Materials, Central South University, Changsha 410083, China
Abstract：Powder metallurgy bronze-graphite-MoS2 self-lubricating material was prepared by Cu-25%Sn alloy, copper-coated graphite and MoS2 powders at sintering temperature of 740-820 ℃. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to observe and analyze the microstructure of the sintered materials and wear surface morphology after friction under 4 N and 10 N loads, respectively. The results show that with the increase of sintering temperature, the hardness and density of the bronze-graphite-MoS2 self-lubricating materials show a trend of first increasing and then decreasing. The size and number of pores of the material sintered at 780 ℃ are smaller, so the density and hardness of materials are relatively large. The average friction coefficient under 10 N and 4N loads are 0.28 and 0.36, respectively. In the process of friction and wear, a layer of lubricating film composed of graphite and MoS2 is formed on the surface of the materials, which provides lubrication for the self-lubricating material and a better lubrication effect is under a load of 10 N.
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2021, Vol. 26 
