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工艺技术

粉末冶金青铜-石墨-MoS2自润滑材料的制备与摩擦性能

  • 王慧灵 ,
  • 姜锋 ,
  • 童蒙蒙 ,
  • 吴明锦 ,
  • 叶鹏程
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  • 1.中南大学 材料科学与工程学院,长沙 410083;
    2.中南大学 轻合金研究院,长沙 410083;
    3.中南大学 轻质高强结构材料国防科技重点实验室,长沙 410083

收稿日期: 2021-06-15

  修回日期: 2021-07-21

  网络出版日期: 2021-12-22

Preparation and friction properties of bronze-graphite-MoS2 self-lubricating materials

  • WANG Huiling ,
  • JIANG Feng ,
  • TONG Mengmeng ,
  • WU Mingjin ,
  • YE Pengcheng
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  • 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

Received date: 2021-06-15

  Revised date: 2021-07-21

  Online published: 2021-12-22

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。

本文引用格式

王慧灵 , 姜锋 , 童蒙蒙 , 吴明锦 , 叶鹏程 . 粉末冶金青铜-石墨-MoS2自润滑材料的制备与摩擦性能[J]. 粉末冶金材料科学与工程, 2021 , 26(6) : 531 -536 . DOI: 10.19976/j.cnki.43-1448/TF.2021060

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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