高速列车铜基摩擦材料的氧化行为  

Oxidation behavior of Cu-based brake pad for high-speed train

作　　者：肖金坤[1] 李天天 鲍霆峰 陈娟 张超[1] Jin-kun XIAO;Tian-tian LI;Ting-feng BAO;Juan CHEN;Chao ZHANG(School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China;Testing Center,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]扬州大学机械工程学院,扬州225127 [2]扬州大学测试中心,扬州225009

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第7期2260-2274,共15页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51804272);High-end Talent Support Program of Yangzhou University(China);Qinglan Project of Yangzhou University(China);Yangzhou City-Yangzhou University Cooperation Foundation,China(No.YZ2022183);Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(No.SJCX22_1716);Innovation and Entrepreneurship Training Program for College Students of Jiangsu Province,China(No.202211117173T)。

摘　　要：高速列车铜基摩擦材料在制动过程中,由于摩擦热的产生和耗散,会发生循环氧化。研究铜基摩擦材料在300、400、500、600和700℃下等温氧化50h的氧化行为。结果表明:铜基摩擦材料的氧化行为呈现多阶段特征;Cu、Fe的氧化与氧的扩散共同控制着低温氧化过程,而石墨的氧化在500℃之后占主导作用;Cu的氧化首先形成Cu_(2)O纳米团簇,然后生成CuO纳米线,最后依次转变为细小的和粗大的等轴晶;氧化温度的升高会促进Fe_(2)O_(3)纳米片的生长和致密化;Cu氧化物由于体积膨胀较大,逐渐将Fe氧化物覆盖;石墨烧蚀后形成的连通孔为内氧化提供氧气扩散通道;材料表面氧化层的形成使得表面硬度提高。Cu-based brake pad for high-speed train undergoes cyclic oxidation due to the generation and dissipation of friction heat during braking.The oxidation behavior of the Cu-based brake pad was investigated via isothermal oxidation at 300,400,500,600 and 700°C for up to 50 h.The results show that the oxidation of the Cu-based brake pad presents multiple stages.The combination of the oxidation of Cu and Fe and the oxygen diffusion controls the oxidation process in the earlier stage,while the oxidation of graphite plays a more important role in the later stages above 500°C.The Cu_(2)O nanoclusters are firstly formed by the oxidation of copper,then CuO nanowires,and finally fine and coarse equiaxed grains are generated.The rise in temperature promotes the growth and densification of Fe_(2)O_(3)nanosheets,which grow on the Fe_(3)O_(4)layer.However,Fe oxides are gradually covered by Cu oxides because of the larger volume expansion of Cu oxides.The connected pores formed by the graphite burn-off provide oxygen diffusion channels for internal oxidation.The improved surface microhardness is attributed to the formation of oxides.

关 键 词：铜基摩擦材料 等温氧化动力学 氧化行为 表面形貌 

分 类 号：U270.4[机械工程—车辆工程] TG146.11[交通运输工程—载运工具运用工程]