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CN 34-1054/N

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Study on X-ray nondestructive testing of SOFC metal brazing

  • Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 230026,China

Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2017.12.005
  • Received Date: 13 May 2016
  • Rev Recd Date: 17 June 2016
  • Publish Date: 30 December 2017
    Abstract

  • Abstract

    In order to solve the sealing problems of tube plate type (plate type) solid oxide fuel cell(SOFC), 95AgCu solder was used to seal single cell and interconnector by air brazing. The difference between 95AgCu solder and powder was analyzed by X-ray nondestructive testing and the welding quality was evaluated through life test of single cells. Results show that the use of X-ray nondestructive test can not only optimize the welding process, but also form high-quality and imporous weld utilizing a forming welding piece. Measured open circuit voltage and single cell power within 120 h at 750 ℃ show that brazing materials and the process are suitable for sealing the SOFC stack.

    Abstract

    In order to solve the sealing problems of tube plate type (plate type) solid oxide fuel cell(SOFC), 95AgCu solder was used to seal single cell and interconnector by air brazing. The difference between 95AgCu solder and powder was analyzed by X-ray nondestructive testing and the welding quality was evaluated through life test of single cells. Results show that the use of X-ray nondestructive test can not only optimize the welding process, but also form high-quality and imporous weld utilizing a forming welding piece. Measured open circuit voltage and single cell power within 120 h at 750 ℃ show that brazing materials and the process are suitable for sealing the SOFC stack.
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    • References(13)
  • [1]
    朱庆山，彭练，黄文来，等.固体氧化物燃料电池密封材料的研究现状与发展趋势[J].无机材料学报,2006, 21(2) :284-290.
    ZHU QingShan, PENG Lian, HUANG Wenlai, et al. Present status and development trends of sealing materials for solid oxide fuel cells[J]. Journal of Inorganic Materials, 2006, 21(2) :284-290.
    [2]
    谢得明，童少平，吴芳芳,等.SOFC封接材料及技术的研究进展[J].Battery Bimonthly（电池）， 2006,36(4): 319-321.
    XIE Deming, TONGShaoping, WU Fangfang, et al. Research progress in sealing materials and techniques used for SOFC[J]. Battery Bimonthly， 2006,36(4): 319-321.
    [3]
    STEVENSON J. SOFC seals: Materials status[C]// SECA Core Technology Program-SOFC Seal Meeting. Albuquerque, NM: Sandia National Laboratory,2003.
    [4]
    Fergus J Ｗ. Sealants for solid oxide fuel cells[J]. Journal of Power Sources 2005,147(1/2): 46-57.
    [5]
    WEIL K S, COYLE C A, HARDY J S, et al. Alternative planar SOFC sealing concepts[J]. Fuel Cell Bull, 2004(5):11-16.
    [6]
    WEIL K S, HARDY J S, RICE J P, et al. Brazing as a means of sealing ceramic membranes for use in advanced coal gasification processes[J]. Fuel, 2006, 85(2):156-162.
    [7]
    JIN Y K , HARDY J S, WEIL K S. Effects of CuO content on the wetting behavior and mechanical properties of a Ag-CuO braze[J]. Journal of the American Ceramic Society, 2005,88(9):2521-2527.
    [8]
    WEIL K S, COYLE C A, DARSELL J T, et al. Effects of thermal cycling and thermal aging on the hermeticity and strength of silver-copper oxide air-brazed seals[J]. Journal of Power Sources, 2005, 152(1):97-104.
    [9]
    HARDY J S, JIN Y K, WEIL K S. Joining mixed conducting oxides using an air-fired electrically conductive braze[J]. Journal of The Electrochemical Society, 2004, 151(8): J43-J49.
    [10]
    JIN Y K, HARDY J S, WEIL K S. Novel metal-ceramic joining for planar SOFCs[J]. Journal of The Electrochemical Society, 2005, 152(6):J52-J58.
    [11]
    WEIL K S, JIN Y K , HARDY J S. Reactive air brazing: A novel method of sealing SOFCs and other solid-state electrochemical devices[J]. Electrochemical and Solid-State Letters, 2005, 8(2):A133-A136.
    [12]
    WEIL K S, JIN Y K, HARDY J S, et al. The effect of TiO2 on the wetting behavior of silver-copper oxide braze filler metals[J]. Scripta Materialia, 2006,54(6):1071-1075.
    [13]
    杨鹏飞，谢斌.平板式SOFC封接的实验研究[J].中国科学技术大学学报，2009,39(4):380-384.
    YANGPengfei, XIE bin. Study on sealing planar SOFC[J]. Journal of University of Science and Technology of China, 2009,39(4):380-384.
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    [1]
    朱庆山，彭练，黄文来，等.固体氧化物燃料电池密封材料的研究现状与发展趋势[J].无机材料学报,2006, 21(2) :284-290.
    ZHU QingShan, PENG Lian, HUANG Wenlai, et al. Present status and development trends of sealing materials for solid oxide fuel cells[J]. Journal of Inorganic Materials, 2006, 21(2) :284-290.
    [2]
    谢得明，童少平，吴芳芳,等.SOFC封接材料及技术的研究进展[J].Battery Bimonthly（电池）， 2006,36(4): 319-321.
    XIE Deming, TONGShaoping, WU Fangfang, et al. Research progress in sealing materials and techniques used for SOFC[J]. Battery Bimonthly， 2006,36(4): 319-321.
    [3]
    STEVENSON J. SOFC seals: Materials status[C]// SECA Core Technology Program-SOFC Seal Meeting. Albuquerque, NM: Sandia National Laboratory,2003.
    [4]
    Fergus J Ｗ. Sealants for solid oxide fuel cells[J]. Journal of Power Sources 2005,147(1/2): 46-57.
    [5]
    WEIL K S, COYLE C A, HARDY J S, et al. Alternative planar SOFC sealing concepts[J]. Fuel Cell Bull, 2004(5):11-16.
    [6]
    WEIL K S, HARDY J S, RICE J P, et al. Brazing as a means of sealing ceramic membranes for use in advanced coal gasification processes[J]. Fuel, 2006, 85(2):156-162.
    [7]
    JIN Y K , HARDY J S, WEIL K S. Effects of CuO content on the wetting behavior and mechanical properties of a Ag-CuO braze[J]. Journal of the American Ceramic Society, 2005,88(9):2521-2527.
    [8]
    WEIL K S, COYLE C A, DARSELL J T, et al. Effects of thermal cycling and thermal aging on the hermeticity and strength of silver-copper oxide air-brazed seals[J]. Journal of Power Sources, 2005, 152(1):97-104.
    [9]
    HARDY J S, JIN Y K, WEIL K S. Joining mixed conducting oxides using an air-fired electrically conductive braze[J]. Journal of The Electrochemical Society, 2004, 151(8): J43-J49.
    [10]
    JIN Y K, HARDY J S, WEIL K S. Novel metal-ceramic joining for planar SOFCs[J]. Journal of The Electrochemical Society, 2005, 152(6):J52-J58.
    [11]
    WEIL K S, JIN Y K , HARDY J S. Reactive air brazing: A novel method of sealing SOFCs and other solid-state electrochemical devices[J]. Electrochemical and Solid-State Letters, 2005, 8(2):A133-A136.
    [12]
    WEIL K S, JIN Y K, HARDY J S, et al. The effect of TiO2 on the wetting behavior of silver-copper oxide braze filler metals[J]. Scripta Materialia, 2006,54(6):1071-1075.
    [13]
    杨鹏飞，谢斌.平板式SOFC封接的实验研究[J].中国科学技术大学学报，2009,39(4):380-384.
    YANGPengfei, XIE bin. Study on sealing planar SOFC[J]. Journal of University of Science and Technology of China, 2009,39(4):380-384.
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