首页|高速列车铜基摩擦材料的氧化行为

高速列车铜基摩擦材料的氧化行为

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
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50 h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Cu2O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Fe2O3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.
Oxidation behavior of Cu-based brake pad for high-speed train
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 ℃ 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 ℃.The Cu2O 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 Fe2O3 nanosheets,which grow on the Fe3O4 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.

Cu-based brake padisothermal oxidation kineticsoxidation behaviorsurface morphology

肖金坤、李天天、鲍霆峰、陈娟、张超

展开 >

扬州大学 机械工程学院,扬州 225127

扬州大学测试中心,扬州 225009

铜基摩擦材料 等温氧化动力学 氧化行为 表面形貌

National Natural Science Foundation of ChinaHighend Talent Support Program of Yangzhou University(China)Qinglan Project of Yangzhou University(China)Yangzhou City-Yangzhou University Cooperation Foundation,ChinaPostgraduate Research & Practice Innovation Program of Jiangsu Province,ChinaInnovation and Entrepreneurship Training Program for College Students of Jiangsu Province,China

51804272YZ2022183SJCX22_1716202211117173T

2024

10.1016/S1003-6326(24)66539-8

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(7)