| Project/Area Number |
07555476
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Physical properties of metals
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
TANAKA Kazuhide Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (00024232)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITANI Shin Sanyo Electric Co., Ltd., New Materials Research Center, Chief Engineering, ニューマテリアル研究所, 主任研究員
YONEZU Ikuro Sanyo Electric Co., Ltd., New Materials Research Center, Chief Engineering, ニューマテリアル研究所, 主任研究員
YAMADA Masaaki Nagoya Institute of Technology, Faculty of Engineering, Assistant, 工学部, 助手 (30024342)
YOSHINARI Osamu Nagoya Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10134040)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Hydrogen storage / Amorphous / Nanocrystalline / Multilayrs / Nd-Fe (Co) -B / Mg-Ni-La (Nd) / Absorbing kinetics / PCT characteristics / Mg-Ni-La系 / Mg-Ni-Na系 / 液体急冷法 / ナノ結晶 / 水素放出スペクトル / X線構造解析 / 吸蔵放出速度 / 水素 / 希土類 / 結晶化 |
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| Research Abstract |
The objective of this research is to find novel hydrogen-storage alloys with amorphous as well as nanocrystalline structures, and to investigate their hydrogen storage properties. In addition, effects of hydrogenation on the structural change or stability of metallic multilayrs have also been studied.
1. Hydrogen absorption in amorphous alloys Binary and ternary alloys containing transition metals and/or rare earths have been investigated. Alloys of Nd-Fe, Nd-Fe-B and Nd-Co-B systems with 5-30 at.%Nd have been studied in detail, and relationships between the hydrogen-storage ability and atomistic structures of the amorphous alloys have been revealed. Furthermore, amorphous alloys of Zr-Ni-V and Zr-Ni-Nballoys with 25-35 aat.%Zr and 5-25 at.%V and Nb have been studied. We succeeded in producing several amorphous alloys with good hydrogen-storage ability and structural stability, but their hydrogen absorbing and desorbing kinetics below 373K were not fast enough in comparison with those o
… More
f conventional intermetallic compounds and deserve further investigation.
2. Hydrogen absorption in nanocrystalline alloys Alloys of Mg-Ni, Ng-Ni-La and Mg-Ni-Nd systems have been mainly studied. Nanocrystalline structures of these alloys with grain sizes of 50-100 nm have been obtained by annealing melt-spun amorphous alloys at temperatures just above the respective crystallization temperatures. These nanocrystalline alloys exhibit faster hydrogen absorbing kinetics and better PCT characteristics than the corresponding as-cast alloys with coarse grains. With further improvements, they will be used as practical hydrogen storage materials operative at 473-573K.
3. Structure stabilization of metallic multilayrs by hydrogenation In the course of study of hydrogen absorption in metallic multilayrs such as Pd/Ti, Ni/Ti and Fe/Ti, we found that the multilayr structures are thermally stabilized by hydrogenation up to about 723K.Without hydrogenation, they should undergo interlayr mixing to form homogeneous equilibrium intermetallic phases. This stabilization is attributed to the transformation of Ti layrs into TiH_2, and may be applicable to multilayr technologies. Less
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