Abstract
Ni-Nb-Ti-Zr glassy alloys were developed as separator plates for polymer electrolyte fuel cell. Results are summarized as follows. Higher Nb containing Ni-Nb-Ti-Zr glassy alloys show better corrosion resistance in sulfuric acid. Corrosion rate of the Ni-15Nb-15Ti-10Zr glassy alloy was three orders of magnitude lower than that of SUS316L steel. Ultra-thin separator sheets with flow channels could be formed precisely by hot pressing the Ni-15Nb-15Ti-10Zr glassy metal strip by hot pressing near the glass transition temperature without crystallization. Single cell with Ni-15Nb-15Ti-10Zr glassy metal separator plates show higer cell voltage than that with SUS316L separator plates, because of lower cell resitance. In the 1080 ks operating test, the voltage drop rate was also equivalent to the graphite separator plates.
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