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Study of hydrogen migration mechanisms in materials with complex crystal textures

Research Project

Project/Area Number 12680502
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般
Research InstitutionEhime University

Principal Investigator

YAMAKAWA Kohji  Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (50029493)

Co-Investigator(Kenkyū-buntansha) IWASE Akihiro  JAERI, Department of Material Science, Head Researcher, 物質科学部, 主任研究員 (60343919)
YANO Tadashi  Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (50036240)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsHydrogen / Multi-layers / Hydrogen permeation / Hydrogen diffusion / Surface / 拡散 / 表面状態
Research Abstract

The hydrogen permeability measurements in Pd, Fe, Ni membranes have been done by the gas permeation method by an ultrahigh vacuum apparatus. The use of an ultrahigh vacuum apparatus enables us to measure at low pressure and temperature and at thin foil. It is shown that the hydrogen permeation through Pd membrane is exceedingly affected by the surface contamination of the specimen. The contaminants are taken off from the Pd surface by short aging at low temperatures. After this surface cleaning, the amount of hydrogen permeation increases and shows linear-like Arrhenius relation.
From above results, our permeation method is suitable for hydrogen permeation experiment of multi-layers specimen. Therefore, the permeation of hydrogen is measured for various number of layers and thickness of multi-layers in Pd-Fe and Pd-Ni systems on Pd base plate.
Even after cleaning the Pd surface, the amount of hydrogen permeation through Pd-Ni multi-layers does not show linear-like Arrhenius relation and is larger than that from model calculation in which the bulk property values of Ni are used. From the experimental results and model calculations, it is concluded that the permeation through Pd-Ni multi-layers is not affected by inter Pd layers and boundary layers. Enhanced hydrogen permeation is caused by high grain boundary permeation through small grained Ni layers.
After cleaning the Pd surface, the permeation amount through Pd-Fe multi-layers showed linear-like Arrhenius relation, but the dependence for the thickness and number of Fe layers was complex. Further investigation must be needed for this system. The amount through Pd-Fe multi-layers decreased than those obtained from model calculation different from the case of Pd-Ni system.
Surface analysis of Pd foil is done by Auger electron spectroscopy and hydrogen gas permeation through Pd is suppressed by C atoms which may come from hydrocarbons.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] K.Yamakawa et al.: "Surface Adsorbed Atoms Suppressing Hydrogen Permeation of Pd Membranes"J. Alloys and Comp.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Chimi et al.: "Thermal Relaxation of Hydrogen Disordering in Pd-H System Irradiated with High-Energy Particles"J. Alloys and Comp.. 330-332. 187-190 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamakawa, et al.: "Hydrogen Permeability Measurement through Pd, Ni and Fe membranes"J. Alloys and Comp.. 321. 17-23 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamakawa et al.: "Surface Adsorbed Atoms Suppressing Hydrogen Permeation of Pd Membranes"J.Alloys and Comp.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Chimi et al.: "Thermal Relaxation of Hydrogen Disordering in Pd-H System Irradiated with High-Energy Particles"J.Alloys and Comp.. 187-190. 330-332 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamakawa et al.: "Hydrogen Permeability Measurement through Pd, Ni and Fe membranes"J.Alloys and Comp.. 17-23. 321 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamakawa, et al.: "Surface Adsorbed Atoms Suppressing Hydrogen Permeation of Pd Membranes"J. Alloys and Comp.. in press.

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Chiimi, et al.: "Thermal Relaxation of Hydrogen Disordering in Pd-H System Irradiated with High-Energy Particles"J. Alloys and Comp.. 330-332. 187-190 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yamakawa et al.: "Hydrogen permeability measurement through Pd, Ni and Fe membranes"Journal of Alloys and Compounds. 321. 17-23 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yamakawa et al.: "Hydrogen permeability through Pd-Fe and Pd-Ni multilayer systems"Zeitschrift fur Metallkunde. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yamakawa: "Hydrogen permeability measurement through Pd, Ni and Fe membranes"Journal of Alloys and Compounds. (in press). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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