In-situ generated graphene from wheat flour for enhancing mechanical and electrical properties of copper matrix composites

Yang, Tao, Chen, Wenge, Zhang, Hui, Ma, Longhai and Fu, Yong Qing (2022) In-situ generated graphene from wheat flour for enhancing mechanical and electrical properties of copper matrix composites. Materials Science and Engineering A, 835. p. 142662. ISSN 0921-5093

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Graphene, with its excellent mechanical properties and electrical conductivity, has been considered as an effective reinforcement phase for copper matrix composites. However, due to its easy agglomeration and poor wetting properties in the copper matrix, it is difficult to simulataneously enhance strength, ductility and conductivity of graphene based copper composites using a low cost and efficient method. In this paper, we proposed a new methodology to use wheat flour as a solid carbon source to in-situ generate graphene-coated copper (Gr@Cu) composite powders. These powders were then used as strengthening phases to fabricate Gr@Cu copper composites through wet mixing and spark plasma sintering (SPS) processes. Results showed that not only high-quality graphene layer was obtained and serious agglomeration of graphene was avoided, but also a strong interfacial bonding between graphene and copper matrix was achieved. The fabricated composites showed excellent properties, e.g., a maximum density of 99, enhanced micro-hardness (15-22 higher than that of pure copper), and excellent strength/ ductility. The maximum tensile strength and yield strength were obtained in the 0.70 wt.Gr@Cu/Cu composites (e.g., 252 MPa and 132 MPa, respectively). These values are ~23 and ~110 higher than those of pure copper, and the elongation rate was maintained at ~30. In addition, the composites showed excellent conductivity.

Item Type: Article
Additional Information: Funding information: The authors would like to acknowledge the financial supports from Shaanxi Coal Industry Group United Fund of China (No.2019JLM-2), Xi’an Science research project of China (No.2020KJRC0089) and Electrical Materials and Infiltration Key Laboratory of Shaanxi Province Projects (No.17JS080), and International Exchange Grant (IEC/NSFC/201078) through Royal Society and National Science Foundation of China (NSFC).
Uncontrolled Keywords: Conductivity, Mechanical Properties, Graphene, Copper Matrix Composites
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 10 Jan 2022 16:44
Last Modified: 18 Jan 2023 08:00

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