Preparation and Characterization of Ni-coated Carbon Fiber Reinforced Cu-based Composites
JIA Jiangang1, GAO Changqi1, LIU Diqiang1, JI Genshun1, XUE Xiangjun2, GUO Tieming1, HAO Xiangzhong2
1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050; 2 Gansu Haoshi Carbon Fiber Co., Ltd., Lanzhou 730010
Abstract: In order to enhance the interface bonding strength between carbon fiber and the Cu-based composites, uniformly nickel coating with controlled thickness of 1 μm was electroplated on the short carbon fibers. Afterwards, the Cu coating with a thickness of about 6 μm is prepared. Based on that, the Nickel coated carbon fiber reinforced copper matrix composites was prepared by spark plasma sintering with Ni-Cu coated carbon fibers under 20 MPa at 800 ℃ for 5 min. Meanwhile, the carbon fiber reinforced copper with the same volume fraction of Cf was prepared under the same sintering conditions. The morphology and the phase composition of the Ni coating were characterized by SEM and XRD respectively. Furthermore, the surface and fracture morphology and the interface of Cf and Cu were researched through SEM equipped with EDS. The tensile mechanical properties of nickel-coated carbon fibers and copper-coated carbon fibers were preliminarily studied by the electronic tensile testing machine. Results show that the tensile strength of the nickel-coated carbon fibers were higher than that of the uncoated fibers,while the elongation was slightly reduced compared with the uncoated fibers. No delamination of Ni coating occurs during the tensile process, which can be attributed to the stronger bonding strength between Cf and Ni coating. The Ni-coated carbon fibers reinforced Cu-based composites (Cf/Cu(Ni)) show higher plastic deformation fracture and the mechanical properties of Cf/Cu(Ni) than that of Cf/Cu composites. The tensile strength of Cf/Cu(Ni) was about 20% higher than that of the Cf/Cu composites.
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2018, Vol. 32 
