Carbon quantum dots (CQDs), which contain a core structure composed of sp² carbon, can be used as the reinforcing phase like graphene and carbon nanotubes in metal matrix. In this paper, the CQD/Cu composite material was prepared by powder metallurgy method. The composite powder was prepared by molecular blending method and ball milling method at first, and then densified into bulk material by spark plasma sintering (SPS). X-ray diffraction, Raman spectroscopy, infrared spectroscopy, and nuclear magnetic resonance were employed to characterize the CQD synthesized under different temperature conditions, and then CQDs with a higher degree of sp² were utilized as the reinforcement to prepare composite materials with different contents. Mechanical properties and electrical conductivity results show that the tensile strength of the 0.2 CQD/Cu composite material is ∼31% higher than that of the pure copper sample, and the conductivity of 0.4 CQD/Cu is ~96% IACS, which is as high as pure copper. TEM and HRTEM results show that good interface bonding of CQD and copper grain is the key to maintaining high mechanical and electrical conductivity. This research provides an important foundation and direction for new carbon materials reinforced metal matrix composites.

包含由sp ²碳组成的核心结构的碳量子点（CQDs）可以用作增强相，就像金属基质中的石墨烯和碳纳米管一样。本文采用粉末冶金法制备了CQD / Cu复合材料。首先通过分子混合法和球磨法制备复合粉末，然后通过火花等离子体烧结（SPS）将其致密化为块状材料。利用X射线衍射，拉曼光谱，红外光谱和核磁共振来表征在不同温度条件下合成的CQD，然后表征具有更高sp ²的CQD。用作增强材料以制备不同含量的复合材料。力学性能和电导率结果表明，0.2 CQD / Cu复合材料的抗拉强度比纯铜样品高约31％，0.4 CQD / Cu的电导率约为96％IACS，这与纯铜样品相比高。作为纯铜。TEM和HRTEM结果表明，CQD和铜晶粒之间的良好界面结合是保持高机械和导电性的关键。该研究为新型碳材料增强金属基复合材料提供了重要的基础和方向。