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Effect of baking processes on properties of TiB2/C composite cathode material

  • Xiao-jun Lü (吕晓军)Email author
  • Jie Li (李劼)
  • Yan-qing Lai (赖延清)
  • Zhao Fang (方钊)
Article

Abstract

Pitch and TiB2/C green composite cathode material were respectively analyzed with simultaneous DSC-TGA, and effects of three baking processes of TiB2/C composite cathode material, i.e. K25, K5 and M5, on properties of TiB2/C composite cathode material were investigated. The results show that thermogravimetric behavior of pitch and TiB2/C green composite cathode is similar, and appears the largest mass loss rate in the temperature range from 200 to 600°C. The bulk density variation of sample K5 before and after baking is the largest (11.9%), that of sample K25 is the second, and that of sample M5 is the smallest (6.7%). The crushing strength of sample M5 is the biggest (51.2 MPa), that of sample K25 is the next, and that of sample K5 is the smallest (32.8 MPa). But, the orders of the electrical resistivity and electrolysis expansion of samples are just opposite with the order of crushing strength. The heating rate has a great impact on the microstructure of sample. The faster the heating rate is, the bigger the pore size and porosity of sample are. Compared with the heating rate between 200 and 600° of samples K25 and K5, that of sample M5 is slower and suitable for baking process of TiB2/C composite cathode material.

Key words

aluminum electrolysis TiB2/C composite cathode material baking process 

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References

  1. [1]
    SORLIE M, ØYE H A. Cathodes in aluminum electrolysis [M]. 2nd ed. Dusseldorf: Aluminum-Verlag, 1994: 162–163.Google Scholar
  2. [2]
    LIU Ye-xiang. Research progress of inert anode and wettable cathode for aluminum electrolysis [J]. Light Metals, 2001(5): 26–29. (in Chinese)Google Scholar
  3. [3]
    LI Qing-yu. Development and industrial application of wettable inert TiB2 cathodic composite coating for aluminum electrolysis [D]. Changsha: Central South University, 2003. (in Chinese)Google Scholar
  4. [4]
    WELCH B J. Future materials requirements for the high-energy intensity production of aluminum [J]. Journal of Metals, 2001, 53(2): 13–15.Google Scholar
  5. [5]
    LI Jie, LÜ Xiao-jun, LAI Yan-qing, LI Qing-yu, LIU Ye-xiang. Research progress in TiB2 wettable cathode for aluminum reduction [J]. Journal of the Minerals Metals & Materials Society, 2008, 60(8): 32–37.CrossRefGoogle Scholar
  6. [6]
    KVANDE H. Energy balance [C]// Fundamentals of Aluminum Production 2004. Trondheim, 2004: 197–216.Google Scholar
  7. [7]
    LI Jie, LÜ Xiao-jun, LAI Yan-qing, LI Qing-yu, TIAN Zhong-liang, FANG Zhao. Effect of carbon fibre on properties of TiB2/C composite cathode coating for aluminum electrolysis [J]. Journal of Central South University of Technology, 2008, 15(4): 526–530.CrossRefGoogle Scholar
  8. [8]
    QIAN Zhen-fen. Carbon process [M]. Beijing: Metallurgical Industry Press, 2006: 121–126. (in Chinese)Google Scholar
  9. [9]
    LI Qing-yu, LAI Yan-qing, LI Jie, LIU Ye-xiang. Solidification and carbonization program of TiB2 cathode coating for aluminum electrolysis [J]. The Chinese Journal of Nonferrous Metals, 2003, 13(1): 251–254. (in Chinese)Google Scholar
  10. [10]
    LI Jie, FANG Jing, LI Qing-yu, LAI Yan-qing. Effect of TiB2 content on resistance to sodium penetration of TiB2/C cathode composites for aluminum electrolysis [J]. Journal of Central South University of Technology, 2004, 11(4): 400–404.CrossRefGoogle Scholar
  11. [11]
    LI Jie, LÜ Xiao-jun, LI Qing-yu, LAI Yan-qing, YANG Jian-hong. Electrical resistivity of TiB2/C composite cathode coating for aluminum electrolysis [J]. Journal of Central South University of Technology, 2006, 13(3): 209–213.CrossRefGoogle Scholar
  12. [12]
    XUE Ji-lai, ØYE H A. Sodium and bath penetration into TiB2-carbon cathodes during laboratory aluminum electrolysis [C]// CUTSHALL E R. Light Metals, 1992. Warrendale PA, TMS, 1992: 773–778.Google Scholar
  13. [13]
    IBRAHIEM M O, FOOSNASS T, ØYE H A. Properties of pitch and furan-based TiB2-C cathodes [C]// DAVID H D. Light Metals 2008. New Orleans: TMS, 2008: 1013–1018.Google Scholar
  14. [14]
    BRISSON P Y, SOUCY G. Revisiting sodium and bath penetration in the carbon lining of aluminum electrolysis cell [C]// KVANDE H. Light Metals 2005. Warrendale PA: TMS, 2005: 727–732.Google Scholar
  15. [15]
    ZOLOCHEVSKY A, HOP J G, SERVANT G, FOOSNAES T, ØYE H A. Rapoport-Samoilenko test for cathode carbon materials I: Experimental results and constitutive modelling [J]. Carbon, 2003, 41(3): 497–505.CrossRefGoogle Scholar

Copyright information

© Central South University Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • Xiao-jun Lü (吕晓军)
    • 1
    Email author
  • Jie Li (李劼)
    • 1
  • Yan-qing Lai (赖延清)
    • 1
  • Zhao Fang (方钊)
    • 1
  1. 1.School of Metallurgical Science and EngineeringCentral South UniversityChangshaChina

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