▎ 摘　　要

NOVELTY - Preparing high-performance composite material, comprises (1) performing surface treatment to graphene material, where the graphene material comprises graphene or its derivative; (2) adding nano metal particles into cetyltrimethylammonium bromide solution for surface treatment, and ultrasonically dispersing to obtain suspension; (3) adding processed graphene material into suspension, ultrasonically dispersing, stirring and reacting, washing and drying reaction product to obtain filling particles; (4) processing the surface of the metal particle with large particle diameter; and (5) mixing the filling particles with large particle size metal particles, and adding auxiliary agent for sintering to obtain composite material with high compact and high heat conductivity, where the particle diameter ratio of the filling particle to the large particle diameter metal particle is 0.1-0.5. USE - The method is useful for preparing high-performance composite material used in making semiconductor packaging materials, interconnection lines, and thermal interface materials (claimed). ADVANTAGE - The method can realize the effective coating of the graphene/nano-metal at room temperature, tight combination, and can be sintered at low temperature and low pressure to obtain a high-performance composite material. The material has a certain graphene anti-oxidation ability, can improve the compactness of the sintered body, reduce the thermal expansion coefficient when mixed and sintered with large-size metal particles, uses graphene High performance and high thermal conductivity composite materials can be obtained under low temperature and low pressure conditions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for high-performance composite material, prepared as mentioned above.