Effect of graphite content on friction and wear properties of copper-based friction materials
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摘要: 采用粉末冶金压烧技术制备了含不同质量分数石墨的铜基摩擦材料,研究了石墨含量对摩擦材料微观组织、磨损性能和磨损机理的影响。结果表明:铜基体的连续性随石墨含量增加而降低,动摩擦系数随石墨含量的增加先增加后降低,磨损量随着石墨含量的增加而减小;材料的磨损机理为犁沟式磨料磨损;石墨质量分数为16%时,试样动摩擦系数和静摩擦系数最高并且稳定,具有最好的摩擦磨损性能。Abstract: Copper-based friction materials with graphite in the different mass fraction were prepared by powder metallurgy sintering technology. The effects of graphite content on the microstructure, wear properties, and wear mechanism of the friction materials were studied. The results show that, with the increase of graphite content, the copper matrix continuity decreases, the dynamic friction coefficient increases first and then decreases, and the abrasion loss decreases. The wear mechanism of the friction material is plough-type abrasive wear. When the graphite mass fraction is 16%, the dynamic friction coefficient and the static friction coefficient are the highest and stable, showing the best friction and wear properties.
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Key words:
- copper-based friction material /
- powder metallurgy /
- graphite /
- friction and wear /
- wear mechanism
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表 1 实验用铜基粉末冶金摩擦材料化学成分(质量分数)
Table 1. Chemical composition of the copper-based frictionmaterials by powder metallurgy used in experiment
% 试样编号 Cu 合金元素 二氧化硅 石墨 A1 余量 16 3 10 A2 余量 16 3 12 A3 余量 16 3 16 A4 余量 16 3 20 表 2 摩擦磨损试验参数
Table 2. Friction and wear test parameters
转速/(r·min-1) 压力/MPa 油温/℃ 惯量/(kg·m2) 接合次数/次 油流量/(mL·min-1·cm-2) 2370 2 75~80 0.376 1500 0.37 -
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