A carbon/carbon–Al–Cu composite reinforced with carbon fiber 2.5D-polyacrylonitrile-based preforms was fabricated using the pressureless infiltration technique. The Al–Cu alloy liquids were successfully infiltrated into the C/C composites at high temperature and under vacuum. The mechanical and metallographic properties, scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) of the C/C–Al–Cu composites were analyzed. The results showed that the bending property of the C/C–Al–Cu composites was 189 MPa, whereas that of the pure carbon slide material was only 85 MPa. The compressive strength of C/C–Al–Cu was 213 MPa, whereas that of the pure carbon slide material was only 102 MPa. The resistivity of C/C–Al–Cu was only 1.94 μΩm, which was lower than that of the pure carbon slide material (29.5 μΩm). This finding can be attributed to the “network conduction” structure. Excellent wettability was observed between Al and the carbon matrix at high temperature due to the existence of Al4C3. The friction coefficients of the C/C, C/C–Al–Cu, and pure carbon slide composites were 0.152, 0.175, and 0.121, respectively. The wear rate of the C/C–Al–Cu composites reached a minimum value of 2.56 × 10−7 mm3/Nm. The C/C–Al–Cu composite can be appropriately used as railway current collectors for locomotives.
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机译：使用无压渗透技术制造加强碳纤维2.5D-聚丙烯腈基预制件的碳/碳-Al-Cu复合材料。将Al-Cu合金液体在高温下成功渗透到C / C复合材料中。分析了C / C-Al-Cu复合材料的机械和金相性，扫描电子显微镜（SEM），X射线衍射（XRD）和能量分散光谱（EDS）。结果表明，C / C-Al-Cu复合材料的弯曲性能为189MPa，而纯碳载玻片材料的弯曲性仅为85MPa。 C / C-Al-Cu的抗压强度为213MPa，而纯碳载玻片材料的压缩强度仅为102MPa。 C / C-Al-Cu的电阻率仅为1.94μΩm，低于纯碳载玻片材料（29.5μΩm）。此发现可归因于“网络传导”结构。由于Al 4C3的存在，高温在Al和碳基质之间观察到优异的润湿性。 C / C，C / C-Al-Cu和纯碳载玻片的摩擦系数分别为0.152,0.175和0.121。 C / C-Al-Cu复合材料的磨损率达到2.56×10-7mm3 / nm的最小值。 C / C-Al-Cu复合材料可适当地用作机车的铁路电流收集器。
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