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采用化学镀工艺分别在碳纤维表面施加Ni层、Cu层以及Cu/Ni双层镀层,并对不同镀层的碳纤维进行750℃真空热处理。利用SEM、EDS和XRD对热处理前后镀层形貌、成分、物相以及碳纤维微观结构进行分析。结果表明:热处理前后,镀Cu碳纤维界面结合方式始终为机械结合,镀Ni碳纤维和Cu/Ni双镀层碳纤维界面由机械结合转变为扩散结合;热处理对镀Cu碳纤维结构无影响,而镀Ni和Cu/Ni双镀层碳纤维结构发生了石墨化转变,Ni是造成碳纤维石墨化的主要因素,Cu的存在可以有效的降低Ni对碳纤维结构的改变,所以Cu/Ni双镀层碳纤维石墨化程度要低于镀Ni碳纤维,同时还保证了界面为扩散结合。
The electroless plating process was used to apply Ni layer, Cu layer and Cu / Ni double-layer coating on the surface of carbon fiber, respectively, and carbon fibers of different coating were vacuum heat-treated at 750 ℃. The morphology, composition, phase and carbon fiber microstructure of the coating before and after heat treatment were analyzed by SEM, EDS and XRD. The results show that the bonding interface of Cu-coated carbon fiber is always mechanical before and after heat treatment. The interface of Ni-coated carbon fiber and Cu / Ni double-coated carbon fiber interface is changed into mechanical bonding and diffusion bonding. Heat treatment has no effect on the structure of Cu-coated carbon fiber. / Ni double-coated carbon fiber structure graphitized transition, Ni is the main factor in the graphitization of carbon fibers, the presence of Cu can effectively reduce the Ni on carbon fiber structure changes, so Cu / Ni double-coated carbon fiber graphitization degree is lower than the plating Ni carbon fiber, while also ensuring that the interface is diffusion-bonded.