Graphene has been identified as an efficient filler to increase the strength and conductivity of aluminum but the reaction between aluminum and graphene at elevated temperature is inevitable. In this research, diverse interfacial products between aluminum and graphene were generated by modulating the sintering temperature, and their influences on the mechanical and electrical characteristics of graphene-aluminum composites were examined. Copper encapsulation on graphene has been utilized to isolate graphene from contacting aluminum directly as well as to doping graphene for conduction purposes. The synthesis of copper-coated graphene-reinforced aluminum composites involved several steps, including electrochemical exfoliation, electroless chemical deposition, mechanical ball milling, and high-pressure sintering. The results demonstrate that the formation of a solid solution between copper nanoparticles and aluminum promotes strong interfacial bonding with graphene, leading to a 22.76 % improvement in the conductivity of the composite compared to the pristine aluminum matrix. Additionally, by minimizing the formation of aluminum carbide, the addition of graphene results in a tensile strength of 404 MPa for the composite material, representing a significant 88.8 % increase over the aluminum matrix.

中文翻译：

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界面产物对石墨烯铝复合材料力学和电学性能的影响

石墨烯已被认为是一种有效的填料，可以提高铝的强度和导电性，但铝和石墨烯在高温下的反应是不可避免的。在这项研究中，通过调节烧结温度，在铝和石墨烯之间产生了多种界面产物，并研究了它们对石墨烯-铝复合材料机械和电气特性的影响。石墨烯上的铜封装已用于隔离石墨烯与铝的直接接触以及掺杂石墨烯以达到导电目的。铜包石墨烯增强铝复合材料的合成涉及几个步骤，包括电化学剥离、化学沉积、机械球磨和高压烧结。结果表明，铜纳米粒子和铝之间形成固溶体促进了与石墨烯的牢固界面结合，与原始铝基体相比，复合材料的电导率提高了 22.76%。此外，通过最大限度地减少碳化铝的形成，添加石墨烯可使复合材料的拉伸强度达到 404 MPa，比铝基体显着提高 88.8%。