Lu Ruiyu, Liu Bin, Cheng Huichao, Gao Shenghan, Li Tiejun, Li Jia, Fang Qihong
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China.
State Key Lab of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China.
Materials (Basel). 2022 Sep 5;15(17):6166. doi: 10.3390/ma15176166.
To improve the graphene/copper interfacial bonding and the strength of the copper matrix, Cu-Cr-Mg alloy powder and graphene nanosheets (GNPs) have been used as raw materials in the preparation of a layered graphene/Cu-Cr-Mg composite through high-energy ball-milling and fast hot-pressing sintering. The microstructure of the composite after sintering, as well as the effect of graphene on the mechanical properties and conductivity of the composite, are also studied. The results show that the tensile strength of the composite material reached a value of 349 MPa, which is 46% higher than that of the copper matrix, and the reinforcement efficiency of graphene is as large as 136. Furthermore, the electrical conductivity of the composite material was 81.6% IACS, which is only 0.90% IACS lower than that of the copper matrix. The Cr and Mg elements are found to diffuse to the interface of the graphene/copper composite during sintering, and finely dispersed chromium carbide particles are found to significantly improve the interfacial bonding strength of the composite. Thus, graphene could effectively improve the mechanical properties of the composite while maintaining a high electrical conductivity.
为了改善石墨烯与铜的界面结合以及铜基体的强度，采用Cu-Cr-Mg合金粉末和石墨烯纳米片（GNPs）作为原料，通过高能球磨和快速热压烧结制备了层状石墨烯/Cu-Cr-Mg复合材料。研究了烧结后复合材料的微观结构，以及石墨烯对复合材料力学性能和导电性的影响。结果表明，复合材料的抗拉强度达到349MPa，比铜基体高46%，石墨烯的增强效率高达136。此外，复合材料的电导率为81.6%IACS，仅比铜基体低0.90%IACS。发现Cr和Mg元素在烧结过程中扩散到石墨烯/铜复合材料的界面，并且发现精细分散的碳化铬颗粒显著提高了复合材料的界面结合强度。因此，石墨烯可以在保持高电导率的同时有效改善复合材料的力学性能。
