放电等离子烧结法制备石墨烯-铜铬锆合金的组织与性能  

Microstructure and Properties of Graphene-Reinforced Cu-Cr-Zr Matrix Composites Fabricated by Spark Plasma Sintering

作　　者：王庆娟[1] 樊瑞雪 刘丹[1] 张玉峰 王伟[1] 杜忠泽[1] 刘世锋[1] Wang Qingjuan;Fan Ruixue;Liu Dan;Zhang Yufeng;Wang Wei;Du Zhongze;Liu Shifeng(Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学,陕西西安710055

出　　处：《稀有金属材料与工程》2022年第2期414-421,共8页Rare Metal Materials and Engineering

基　　金：International Science and Technology Cooperation Project of Shaanxi Province,China (2019KW-064);Shaanxi Provincial Department of Education2019 Annual Service for Local Science Research Project (19JC025)。

摘　　要：采用低能球磨和放电等离子烧结法制备了石墨烯(GNPs)增强铜基复合材料。研究了石墨烯含量对复合材料微观结构和性能的影响。结果表明,随着石墨烯含量的增加,复合材料的力学性能呈现出先升高后降低的趋势。其中,当石墨烯含量为0.25%(质量分数)时,复合材料的极限抗压强度为409 MPa,合金的导电率高达90%IACS。石墨烯含量的增加导致其在铜基体中的团聚现象严重。此外,随着石墨烯含量的增加,合金的磨损率不断下降。石墨烯的加入显著改善了摩擦性能。屈服强度的增加是由于石墨烯在铜基体中的均匀分布。同时,载荷从铜基体转移到铬颗粒和石墨烯中,有效地阻碍了位错运动。Copper matrix composites reinforced with graphene nanoplatelets(GNPs) were prepared by low-energy ball milling and spark plasma sintering(SPS). The effects of graphene content on the microstructure and the properties of such composites were studied. The results show that as the graphene content increases, the mechanical properties of the composite first improve and then gradually deteriorate. When the graphene content is 0.25 wt%, the ultimate compressive strength of the composite is 409 MPa and its electrical conductivity is as high as 90% International Annealed Copper Standard(IACS). Further addition of graphene in the composite produces a larger cluster of GNPs within the copper matrix and results in the deterioration of the aforementioned properties. However, as the graphene content continues to increase, the wear rate of the composite declines steadily. The uniform distribution of graphene amongst the copper particles enables the transformation of the external applied load from the copper matrix to the chromium particles and graphene, effectively blocking internal dislocation motion, and thus improving the strength and other tribological properties of the composites.

关 键 词：石墨烯-铜铬锆合金 球磨 放电等离子烧结 组织结构 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]