Microstructural Characteristics and Mechanical Behavior of Spark Plasma-Sintered Cu–Cr–rGO Copper Matrix Composites
Microstructural Characteristics and Mechanical Behavior of Spark Plasma-Sintered Cu–Cr–rGO Copper Matrix Composites
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DOI：
10.1007/s40195-018-0711-y
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Xinjiang Zhang;Zhong-Kui Dai;Xueran Liu;Wenchao Yang;Meng He;Zirun Yang
中科院分区：
文献类型：
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作者：
Xinjiang Zhang;Zhong-Kui Dai;Xueran Liu;Wenchao Yang;Meng He;Zirun Yang
采用放电等离子烧结（SPS）工艺，将固定量的还原氧化石墨烯（rGO）与不同量的Cr混合，制备了铜基复合材料。在烧结的块状复合材料中，层状rGO网络和均匀分布在Cu基体中的Cr颗粒。湿混工艺的机械混合和冷冻干燥阶段均得到Cu/Cr/rGO混合粉末，然后SPS固相烧结实现了混合粉末的快速致密化。Cu-Cr-rGO复合材料的硬度和压缩屈服强度均高于纯Cu和单一rGO添加复合材料，且随着Cr含量的增加而逐渐增加。认为rGO/Cr混合第二相有利于强化Cu基体。讨论了Cu-Cr-rGO复合材料的形成和强化机制。
Copper matrix composites were prepared through spark plasma sintering (SPS) process, mixing fixed amount of reduced graphene oxide (rGO) with the different amounts of Cr. In the sintered bulk composites, the layered rGO network and uniform Cr particles distributed in the Cu matrix. Both of mechanical blending and freeze-drying stages of the wet-mixing process obtained the Cu/Cr/rGO mixture powders, and then SPS solid-phase sintering realized the faster densification of these mixture powders. The hardness and compressive yield strength of the Cu–Cr–rGO composites depicted the higher values than those of pure Cu and single rGO-added composite, and they were gradually increased with increasing Cr. The rGO/Cr hybrid second-phases are believed to be beneficial to strengthening Cu matrix. The relevant formation and strengthening mechanisms involved in Cu–Cr–rGO composites were discussed.