The study of microstructure characterization: Cu modified Cu-Ni-graphite composite
The study of microstructure characterization: Cu modified Cu-Ni-graphite composite
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DOI：
10.1080/09276440.2019.1621598
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发表时间：
2020-03
影响因子：
2.6
通讯作者：
Yiran Wang;Yimin Gao;J. Takahashi;Y. Wan;Xiangdong He;Yunqian Zhang;B. Xiao;Chaowu Zhang
中科院分区：
文献类型：
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作者：
Yiran Wang;Yimin Gao;J. Takahashi;Y. Wan;Xiangdong He;Yunqian Zhang;B. Xiao;Chaowu Zhang
摘要采用镀铜石墨对开关滑板用铜镍基复合材料进行界面改性。迄今为止，对Cu改性Cu-Ni-石墨复合材料的界面特征及改性机理研究较少。本研究采用化学镀法在石墨表面镀覆铜，并采用粉末冶金法制备了铜改性的Cu-Ni-石墨复合材料。研究了铜包覆石墨的微观结构和复合材料的界面形貌。比较了未改性和Cu改性的Cu-Ni-石墨复合材料的力学性能。结果表明，镀层颗粒细小，分布均匀，平均厚度为1.05 μm。界面处的互扩散宽度约为2.54 μm。复合材料中Cu涂层的界面改性机理是降低了石墨和基体中的扩散活性，增加了界面处的扩散驱动力。界面连接方法由机械连接向机械连接与扩散连接相结合过渡。与未改性的复合材料相比，弯曲强度提高了24.4%，硬度提高了9%。图形摘要
ABSTRACT Cu-coated graphite was applied to modify the interface of Cu-Ni-graphite composite used as switch slide baseplate. Up to now, interfacial characterization and modification mechanisms of Cu modified Cu-Ni-graphite composite are seldom researched. In this study, Cu-coated graphite was deposited by chemical plating, and Cu modified Cu-Ni-graphite composite was prepared by powder metallurgy. Both the microstructure characterizations of Cu-coated graphite and interfacial morphologies of the composite were investigated. Then, the comparison of mechanical properties of unmodified and Cu modified Cu-Ni-graphite composite was discussed. The results showed that the Cu coating was made of fine particles with uniform distribution and with the average thickness of 1.05 μm. The mutual diffusion was about 2.54 μm width at the interface. The interfacial modification mechanism of Cu coating in the composite was that the decreasing of diffusion activity both in the graphite and matrix; and the increase of diffusion driving force at the interface. The interfacial bonding method in the transition from mechanical bonding to the combination of mechanical bonding and diffusion bonding. Compared with the unmodified composite, the flexural strength raised 24.4%, and hardness increased by 9%. GRAPHICAL ABSTRACT