Ni-Cu-Al合金粉のドクターブレード成形および多孔質体の焼成(第二報) : Al内部酸化挙動および高温安定性

概要

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Ni-45%Cu-5%Al alloy powder was sintered into a porous sintered alloy and internally oxidized by a novel sintering process consisting of oxidation and reduction. It was oxidized and sintered in air in the temperature range of 450-1, 050°C and reduced by Hz at 700°C in order to investigate the oxidation behavior of Al. Compressive creep tests of the alloy were carried out in an anode environment of molten carbonate fuel cells at 650°C. Upon oxidation, CuAl2O4 coating was formed over the surface of the original powder and Cu diffused out through the CuAl2O4 phase while Ni remained. Upon reduction of the alloy after oxidizing at 1, 050°C, network structure of CuAl2O4 appeared. The alloy had an excellent dimensional stability in the anode environtment of molten carbonate fuel cell.