石墨烯对不锈钢/铝复合材料界面组织结构及其导热性能的影响  

Effect of Graphene on Interfacial Microstructure and Thermal Conductivity of Stainless Steel/Aluminum Composites

作　　者：施展鹏 王联波 李崇阳 王占勇 SHI Zhanpeng;WANG Lianbo;LI Chongyang;WANG Zhanyong(School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China)

机构地区：[1]上海应用技术大学材料科学与工程学院

出　　处：《热加工工艺》2024年第21期67-72,共6页Hot Working Technology

基　　金：上海市科委地方高校能力建设项目(1609053600)。

摘　　要：采用热轧技术制备了石墨烯增强的不锈钢/铝/不锈钢复合材料,研究了退火处理后的界面微观结构,并揭示了其导热增强机制。结果表明,400℃退火后的不锈钢/铝(未添加石墨烯)界面实现了冶金结合,没有明显的金属间化合物扩散层;500℃退火2 h后,不锈钢/铝复合材料界面出现连续的金属间化合物,其厚度随着退火时间和温度的增加而增加。不锈钢/铝界面添加石墨烯后,500℃退火4 h后界面出现非连续金属间化合物。随着石墨烯浓度提高,不锈钢/铝界面处金属间化合物形成量明显减少。当400℃退火时不锈钢/铝/不锈钢复合材料的导热系数随退火时间的增加而增加,500℃退火时,其导热系数随退火时间的增加先增大后减小。石墨烯阻碍了界面金属间化合物的形成,为传热提供了高速通道,添加石墨烯的样品的导热系数始终高于未添加石墨烯的样品。Graphene-enhanced stainless steel/aluminium/stainless steel composites were prepared by hot rolling technique,and the interfacial microstructures after annealing treatment were investigated and the thermal conductivity enhancement mechanism was revealed.The results show that the stainless steel/aluminium interface(without graphene addition)after annealing at 400℃ achieves metallurgical bonding without obvious intermetallic compound diffusion layer;after annealing at 500℃ for 2 h,the stainless steel/aluminium composite interface generates continuous intermetallic compounds,and its thickness increases with the increase of annealing time and temperature.When the graphene is added to the stainless steel/aluminium interface,discontinuous intermetallic compounds appear at the interface after annealing at 500℃ for 4 h.With the increase of graphene concentration,the amount of intermetallic compounds formed at the stainless steel/aluminium interface decreases significantly.The thermal conductivity of the stainless steel/aluminium/stainless steel composites increases with the increase of the annealing time when annealed at 400℃,and it increases firstly then decreases with the increase of the annealing time when annealed at 500℃.Graphene hinders the formation of interfacial intermetallic compounds and provides a high-speed channel for heat transfer,and the thermal conductivity of the samples with graphene addition is always higher than that of the samples without graphene addition.

关 键 词：石墨烯 热轧 热处理 导热系数 

分 类 号：TG156.24[金属学及工艺—热处理]