Ni基金属ガラスの過冷却液体状態における温間プレス加工性および燃料電池用セパレータの試作

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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 Ni60Nb2Cr16Mo2P16B4, Ni65Cr10Nb5P16B4 and Ni65Cr10Mo5P16B4 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 Ni60Nb2Cr16Mo2P16B4 and Ni65Cr10Mo5P16B4 glassy alloys in a supercooled liquid state at Tg + 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).
2007-11-15