Hot-press workability of Ni-based glassy alloys in supercooled liquid state and production of the glassy alloy separators for proton exchange membrane fuel cell

Masanori Yokoyama, Shin Ichi Yamaura, Hisamichi Kimura, Akihisa Inoue

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    Optimum alloy compositions of the Ni-Nb-Cr-Mo-P-B, Ni-Cr-Nb-P-B and Ni-Cr-Mo-P-B glassy alloys were investigated for trail production of separator of fuel cell. Eventually the Ni60Nb2Cr16Mo 2P16B4, Ni65Cr10Nb 5P16B4 and Ni65Cr 10Mo5P16B4 glassy alloys were chosen from the viewpoint of having a wide supercooled liquid region. Then the groove formability of the compositionally optimized alloys in a supercooled liquid state was studied by hot-pressing with the dies having precise grooves. A precise groove forming can be achieved by hot-pressing the Ni 60Nb2Cr16Mo2P16B 4 and Ni65Cr10Mo5P 16B4 glassy alloys in a supercooled liquid state at T g+20 K. However, it was difficult to form the precise grooves in the Ni65Cr10Nb5P16B4 glassy alloy. Finally, we successfully demonstrated that it is possible to form the grooves by hot-pressing using viscous flow deformation in a supercooled liquid state and to produce metallic glassy separators for proton exchange membrane fuel cells (PEMFC).

    Original languageEnglish
    Pages (from-to)773-777
    Number of pages5
    JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
    Volume54
    Issue number11
    DOIs
    Publication statusPublished - 2007 Nov

    Keywords

    • Fuel cell
    • Hot-pressing
    • Metallic glass
    • Separator
    • Supercooled liquid

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Industrial and Manufacturing Engineering
    • Metals and Alloys
    • Materials Chemistry

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