Abstract
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.
摘要
碳量子点(CQD)的核心结构为sp2 碳,可以像石墨烯和碳纳米管一样作为金属基体中的增强相。 本文采用粉末冶金法制备了 CQD/Cu 复合材料,先用分子共混法和球磨法制备复合粉末,再用放电等 离子烧结(SPS)致密化成块状材料。利用X 射线衍射、拉曼光谱、红外光谱和核磁共振对不同温度条 件下合成的 CQD 进行表征,然后利用sp2 含量较高的 CQD 作为增强剂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试样高∼31%, 0.4 CQD/Cu 复合材 料的电导率为 ~96% IACS,与纯铜相当。 TEM 和HRTEM 结果表明, CQD 与铜晶粒良好的界面结合 是保持高力学性能和电导率的关键。本研究为新型碳材料增强金属基复合材料的研制提供了重要的基 础和方向。
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HUANG Xiao provided the concept and edited the draft of manuscript. BAO Rui conducted the literature review and wrote the first draft of the manuscript. YI Jian-hong edited the draft of manuscript.
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HUANG Xiao, BAO Rui, and YI Jian-hong declare that they have no conflict of interest.
Foundation item: Project(52064032) supported by the National Natural Science Foundation of China; Projects(2019ZE001, 202002AB080001) supported by the Yunnan Science and Technology Projects, China; Project (YNWR-QNBJ-2018-005) supported by the Yunnan Ten Thousand Talents Plan Young & Elite Talents, China
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Huang, X., Bao, R. & Yi, Jh. Improving effect of carbonized quantum dots (CQDs) in pure copper matrix composites. J. Cent. South Univ. 28, 1255–1265 (2021). https://doi.org/10.1007/s11771-021-4693-y
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DOI: https://doi.org/10.1007/s11771-021-4693-y