Copper‐graphite composites prepared by spark plasma sintering (SPS) were used as raw material to synthesize copper‐graphite‐polytetrafluoroethylene (PTFE) composites via the hydrothermal impregnation of a PTFE emulsion. The microstructure, hydrophobic performance, friction property and interface behavior were systematically studied using scanning electron microscopy (SEM), a surface science comprehensive tester and a friction tester combined with various characterization methods, such as X‐ray diffraction (XRD), a laser particle size analyzer and metallographic microscopy. The results revealed that the copper‐coated graphite was consistent with the diffraction patterns of copper and graphite, and the coated‐copper had uniformly covered the graphite surface with good interface combination. The interface combination worsened with a decrease of the mass fraction of copper in the composites. Moreover, the water contact angle of the copper‐graphite‐PTFE composite of 50 wt. % Cu after PTFE impregnation reached 160°, and was hence superhydrophobic, while the copper‐graphite‐PTFE composite of 45 wt. % Cu exhibited the optimal performance with a friction coefficient, wear rate and resistivity of 0.112, 3.25×10⁻³ mm³/(N m), and 12×10⁻⁷ Ω m, respectively. PTFE impregnation improved the hydrophobicity and friction‐and‐wear properties of the copper‐graphite composites, and the resulting conductivity could meet the requirements of practical applications. Our results indicated that the content of copper played a crucial part in determining the comprehensive property of copper‐graphite‐PTFE composites.

中文翻译：

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火花等离子体烧结和水热浸渍制备的铜-石墨-聚四氟乙烯复合材料的性能

通过火花等离子体烧结（SPS）制备的铜-石墨复合材料被用作原料，通过水热浸渍PTFE乳液来合成铜-石墨-聚四氟乙烯（PTFE）复合材料。使用扫描电子显微镜（SEM），表面科学综合测试仪和摩擦测试仪结合各种表征方法（例如X射线衍射（XRD），激光粒子）对系统的微观结构，疏水性能，摩擦性能和界面行为进行了系统研究尺寸分析仪和金相显微镜。结果表明，覆铜石墨与铜和石墨的衍射图一致，覆铜均匀地覆盖了石墨表面，具有良好的界面结合。界面组合变差，复合材料中铜的质量分数降低。此外，铜-石墨-PTFE复合材料的水接触角为50 wt。PTFE浸渍后的铜含量达到160°，因此具有超疏水性，而铜-石墨-PTFE复合材料的重量百分比为45。％Cu表现出最佳性能，摩擦系数，磨损率和电阻率分别为0.112，3.25×10^-3  mm ³ /（N m）和12×10 ^-7Ωm  。PTFE浸渍改善了铜石墨复合材料的疏水性和摩擦磨损性能，并且所产生的电导率可以满足实际应用的要求。我们的结果表明，铜的含量在决定铜-石墨-PTFE复合材料的综合性能方面起着至关重要的作用。