| 陈如诗,肖柱,戴杰,李周,徐国富.铜-石墨复合材料性能与石墨形状和粒径的相关性研究[J].有色金属材料与工程,2019,40(5):1-7. |
| 铜-石墨复合材料性能与石墨形状和粒径的相关性研究 |
| Study on the Relationship Between the Properties of Copper-graphite Composite and the Shape and Particle Size of Graphite |
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| DOI：10.13258/j.cnki.nmme.2019.05.001 |
| 中文关键词: 铜-石墨复合材料 形状 粒径 显微组织 摩擦磨损性能 |
| 英文关键词:copper-graphite composite shape granularity microstructure tribological properties |
| 基金项目:国家重点研发计划资助项目（2016YFB0301402） |
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| 摘要点击次数: 133015 |
| 全文下载次数: 2475 |
| 中文摘要: |
| 以电解铜粉、鳞片状石墨粉及不同粒径的近球形石墨粉为原料，通过真空热压烧结工艺制备得到铜-石墨复合材料，并研究石墨形状、粒径对其显微组织、密度、致密度、电导率、硬度及抗压强度等性能的影响；在销盘式摩擦磨损试验机上考察其摩擦磨损性能，通过分析样品磨损表面的形貌，研究石墨形状和粒径对复合材料摩擦磨损性能的影响。结果表明：相比鳞片状石墨粉，采用相同粒径的近球形石墨粉有利于提高复合材料的致密度，获得更优异的力学性能，其抗压强度可以提高近65 MPa；随着近球形石墨粒径从19 μm减小到4 μm，复合材料的致密度、电导率、硬度、抗压强度和摩擦因数均逐渐降低，同时磨损量逐渐增大，其中，复合材料的电导率从28.6 %IACS降低至20.6 %IACS，抗压强度也降低约30 MPa。 |
| 英文摘要: |
| Using electrolytic copper powder, flake graphite and near spherical graphite powder with different particle sizes as raw materials, the copper graphite composite was prepared by vacuum hot pressing sintering process. The effects of graphite shape and size on the microstructure, density, relative density, electrical conductivity, hardness and compression strength were investigated. The wear behavior of the composite was evaluated by using a pin-on-disc friction and wear tester. The effects of graphite shape and particle size on the friction and wear properties of the composite were studied by analyzing the morphology of the wear surface. The results show that, comparing to flaky graphite powder, the use of near spherical graphite powder with the same particle size is beneficial to improve the density of the composite and obtain more excellent mechanical properties with the compressive strength increased by nearly 65 MPa. With particle size of near spherical graphite decreased from 19 μm to 4 μm, the density, conductivity, hardness, compressive strength and friction coefficient of the composite are decreased gradually, while the wear amount is increased gradually. The conductivity of the composite is decreased from 28.6 %IACS to 20.6 %IACS, and the compressive strength is decreased by nearly 30 MPa. |
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