{"title":"高速列车铜基刹车片的氧化行为","authors":"","doi":"10.1016/S1003-6326(24)66539-8","DOIUrl":null,"url":null,"abstract":"<div><p>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<sub>2</sub>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<sub>2</sub>O<sub>3</sub> nanosheets, which grow on the Fe<sub>3</sub>O<sub>4</sub> 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.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":null,"pages":null},"PeriodicalIF":4.7000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665398/pdf?md5=9966fc369d5f03ad71d825c2de6dcc7d&pid=1-s2.0-S1003632624665398-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Oxidation behavior of Cu-based brake pad for high-speed train\",\"authors\":\"\",\"doi\":\"10.1016/S1003-6326(24)66539-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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<sub>2</sub>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<sub>2</sub>O<sub>3</sub> nanosheets, which grow on the Fe<sub>3</sub>O<sub>4</sub> 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.</p></div>\",\"PeriodicalId\":23191,\"journal\":{\"name\":\"Transactions of Nonferrous Metals Society of China\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.7000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S1003632624665398/pdf?md5=9966fc369d5f03ad71d825c2de6dcc7d&pid=1-s2.0-S1003632624665398-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Transactions of Nonferrous Metals Society of China\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1003632624665398\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"METALLURGY & METALLURGICAL ENGINEERING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Transactions of Nonferrous Metals Society of China","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1003632624665398","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
摘要
由于制动过程中摩擦热的产生和散失,高速列车的铜基刹车片会发生周期性氧化。研究人员通过在 300、400、500、600 和 700 °C 温度下进行长达 50 小时的等温氧化,对铜基刹车片的氧化行为进行了研究。在早期阶段,铜和铁的氧化以及氧气扩散共同控制着氧化过程,而在 500 °C 以上的后期阶段,石墨的氧化则起着更重要的作用。铜的氧化首先形成 Cu2O 纳米团簇,然后形成 CuO 纳米线,最后生成细小和粗糙的等轴晶粒。温度的升高促进了生长在 Fe3O4 层上的 Fe2O3 纳米片的生长和致密化。然而,由于 Cu 氧化物的体积膨胀较大,Fe 氧化物逐渐被 Cu 氧化物覆盖。石墨烧蚀形成的连通孔隙为内部氧化提供了氧气扩散通道。表面微硬度的提高归因于氧化物的形成。
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 °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 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.
期刊介绍:
The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.