| Project/Area Number |
07555667
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Metal making engineering
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
ITAGAKI Kimio INSTITUTE FOR ADVANCED MATERIALS PROCESSING,TOHOKU UNIVERSITY PROFESSOR, 素材工学研究所, 教授 (80006048)
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| Co-Investigator(Kenkyū-buntansha) |
OHTSUKA Makoto INSTITUTE FOR ADVANCED MATERIALS PROCESSING,TOHOKU UNIVERSITY RESEARCH ASSOCIATE, 素材工学研究所, 助手 (30241582)
HINO Mitsuhisa INSTITUTE FOR ADVANCED MATERIALS PROCESSING,TOHOKU UNIVERSITY ASSOCIATE PROFESSO, 素材工学研究所, 助教授 (40005335)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | Metallothermic reduction method / Reduction diffusion method / Alloy-making process / Zr-Ni-Mn alloy / Hydrogen storage alloy / Reaction diffusion / Hydrogen-absorbing and -desorbing properties / カルシウム還元 / 合金直接製造法 |
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| Research Abstract |
Aiming at the development of an efficient process to make Zr-Ni-Mn alloy powders directly from the oxide resources of zirconium and manganese by using metallic calcium as a reductant, the hydrogen-absorbing and -desorbing properties of the synthesized alloys and the mechanism of formation of the alloy were studied.
Firstly, more than 50 kinds of Zr-Ni-Mn alloys were synthesized by arc-melting and their properties were investigated in relation to the microstructure and the compositions. It was clarified that the alloys with a single phase just before separating into two-phases have most favorable properties for hydrogen storage, with the compositions of 42.2%Zr, 29.9%Ni and 27.9%Mn or 44.4%Zr, 34.3%Ni and 21.3%Mn.
Secondly, the alloy powders with the compositions of 44.4%Zr, 34.3%Ni and 21.3%Mn were prepared by the metallothermic reduction method. It was found that the alloys were formed through a heterogeneous reaction between nickel in the liquid Ni-Ca alloy phase and the solid Zr and Mn phases. This mechanism was quite defferent from that in making Ni-rare earth alloys by the same method. The properties of the produced alloys for hydrogen storage was found to be a little inferior to those of the alloys produced by the arc-melting. It was considered that the properties must improve by removing the oxide layr formed on the alloy powder which makes the transit of hydrogen atom difficult.
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