Abstract The GNP/Ni-based superalloy composite coating was prepared by laser melting deposition. Compared with superalloy coating, the state of graphene nanoplatelets, friction and wear performance of composite coating were studied. Microstructural characterization of composite coating is performed by SEM, TEM and Raman spectroscopy, which indicates that graphene nanoplatelets are homogeneously distributed in composite coating. The Ni-Cr-Fe phase is the main component and forms a coral-like eutectic group with carbides in the composite coating. Furthermore, the existence of graphene dramatically improves the wear performance of the composite coating. The wear rate and friction coefficient of the GNP composite coating are only 0.019 and 0.73 of those of the Ni-based superalloy coating, respectively. Graphene nanoplatelets wear debris forms a lubricant layer at the friction interface, which significantly improves the wear resistance of the composite coating. We envisage that adding graphene nanoplatelets could be an effective way to improve the tribological properties of laser-deposited Ni-based superalloy coatings.

中文翻译：

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激光熔融沉积GNP/Ni基高温合金复合涂层的组织和摩擦性能

摘要 采用激光熔融沉积法制备了GNP/Ni基高温合金复合涂层。与高温合金涂层相比，研究了石墨烯纳米片的状态、复合涂层的摩擦磨损性能。复合涂层的微观结构表征是通过 SEM、TEM 和拉曼光谱进行的，这表明石墨烯纳米片均匀分布在复合涂层中。Ni-Cr-Fe相是主要成分，与复合涂层中的碳化物形成珊瑚状共晶组。此外，石墨烯的存在显着提高了复合涂层的耐磨性能。GNP复合涂层的磨损率和摩擦系数分别仅为Ni基高温合金涂层的0.019和0.73。石墨烯纳米片磨屑在摩擦界面形成润滑层，显着提高了复合涂层的耐磨性。我们设想添加石墨烯纳米片可能是改善激光沉积镍基高温合金涂层摩擦学性能的有效方法。