王江文,陆龙,孟军虎,郭鸿儒,王静波,吴有智.Cu-2Ni-5Sn-(石墨+PbO)自润滑复合材料高温摩擦学性能的研究[J].摩擦学学报,2018,(1):84~92
Cu-2Ni-5Sn-(石墨+PbO)自润滑复合材料高温摩擦学性能的研究
High Temperature Tribological Properties of Cu-2Ni-5Sn-Graphite-PbO Self-Lubricating Composites
投稿时间:2017-06-07  修订日期:2017-08-31
DOI:10.16078/j.tribology.2018.01.011
中文关键词:  Cu-2Ni-5Sn  自润滑复合材料  高温  摩擦磨损
英文关键词:Cu-2Ni-5Sn  self-lubricating composites  high temperature  friction and wear
基金项目:中科院兰州化学物理研究所“十三五”规划重点培育项目资助.
作者单位E-mail
王江文 1. 兰州理工大学 材料科学与工程学院, 甘肃 兰州 730050
2. 中国科学院兰州化学物理研究所 固体润滑国家重点实验室, 甘肃 兰州 730000 
 
陆龙 兰州工业研究院, 甘肃 兰州 730050  
孟军虎 中国科学院兰州化学物理研究所 固体润滑国家重点实验室, 甘肃 兰州 730000 jhmeng@licp.cas.cn 
郭鸿儒 兰州工业研究院, 甘肃 兰州 730050  
王静波 中国科学院兰州化学物理研究所 固体润滑国家重点实验室, 甘肃 兰州 730000  
吴有智 兰州理工大学 材料科学与工程学院, 甘肃 兰州 730050 youzhiwu@163.com 
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中文摘要:
      采用粉末冶金工艺制备了Cu-2Ni-5Sn-(石墨+PbO)系自润滑复合材料,并采用XRD、SEM、万能材料试验机和高温摩擦磨损试验机等研究了微观组织、力学性能和室温至500 ℃下的摩擦学性能. 结果表明:石墨+PbO复合固体润滑剂质量分数为8%时,该复合材料综合摩擦磨损性能最优. Ni的加入能提高基体的力学性能. 随着温度的增加,该复合材料的摩擦系数几乎保持稳定,磨损率先缓慢增加,后急剧增加. 室温时磨损表面形成以石墨为主成分的润滑膜起主要润滑作用,磨损机理主要为轻微塑性变形和局部剥落. 300 ℃时,由PbO(Fe2O36、石墨和Cu2O组成的致密润滑膜是Cu-2Ni-5Sn-(石墨+PbO)自润滑复合材料具有良好润滑性的主要原因,磨损机理主要包括复合材料塑性变形、局部剥落和轻微的黏着磨损. 500 ℃时,主要由PbO(Fe2O36、石墨、Cu2O和CuO组成的复合润滑膜起到了润滑作用,磨损机理主要为石墨周边区域基体脱落及塑性变形引起的剥落和氧化磨损.
英文摘要:
      Cu-2Ni-5Sn-Graphite-PbO self-lubricating composites were prepared by powder metallurgy. The microstructure and mechanical properties of the composites were examined by using X-ray diffraction, scanning electron microscopy and a universal material testing machine. And the tribological properties of the composites were investigated using a pin-on-disc friction testing configuration from room temperature to 500 ℃. The results indicate that the best comprehensive tribological properties were obtained for graphite+PbO composite of 8%. The addition of Ni enhanced the mechanical properties of the matrix. The friction coefficient of composites remained stable with the increase of temperature. The wear rates of the composites firstly slightly increased and then sharply increased with increasing temperature. At room temperature, the lubricating film was composed mainly of graphite and the main wear mechanism is mild plastic deformation and local peeling off. At 300 ℃, the improved tribological properties of the composites were attributed to the formation of a dense and lubricious film of graphite, PbO(Fe2O3)6 and Cu2O, the main wear mechanism was plastic deformation, local peeling off and adhesive wear. At 500 ℃, the composite lubricating film was composed of PbO(Fe2O3)6, graphite, Cu2O and CuO, and the main wear mechanism was the peeling off of the matrix of graphite surrounding area, peeling off caused by the plastic deformation and oxidative wear.
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