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.
WANG Huiling
,
JIANG Feng
,
TONG Mengmeng
,
WU Mingjin
,
YE Pengcheng
. Preparation and friction properties of bronze-graphite-MoS2 self-lubricating materials[J]. Materials Science and Engineering of Powder Metallurgy, 2021
, 26(6)
: 531
-536
.
DOI: 10.19976/j.cnki.43-1448/TF.2021060
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