摘要
以Cu-25%Sn合金粉、镀铜石墨粉和MoS2粉末为原料,在740~820℃烧结温度下制备粉末冶金青铜-石墨-MoS2自润滑材料。利用扫描电镜(SEM)与X射线衍射仪(XRD)观察和分析摩擦材料的显微组织与结构,并测试和分析材料在4 N和10 N载荷下摩擦10 km过程中的摩擦因数和磨损表面形貌。结果表明,随烧结温度升高,青铜-石墨-MoS2自润滑材料的硬度和密度先升高后下降,在780℃下烧结的材料,孔隙数量较少、尺寸较小,材料密度和硬度较高;在10 N和4 N载荷下平均摩擦因数分别为0.28和0.36。摩擦过程中材料表面形成一层由石墨和MoS2组成的润滑膜,因而具有自润滑性能,在10 N载荷下的自润滑效果更好。
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.
作者
王慧灵
姜锋
童蒙蒙
吴明锦
叶鹏程
WANG Huiling;JIANG Feng;TONG Mengmeng;WU Mingjin;YE Pengcheng(School of Material 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)
出处
《粉末冶金材料科学与工程》
2021年第6期531-536,共6页
Materials Science and Engineering of Powder Metallurgy
