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1998 Fiscal Year Final Research Report Summary

Study on the Combustion Synthesis for Producing High Performance Hydrogen Absorbing Alloy

Research Project

Project/Area Number 09450276
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionTohoku university

Principal Investigator

YAGI Jun-ichiro  Tohoku university.Institute for Advanced Materials Processing Professor, 素材工学研究所, 教授 (20006050)

Co-Investigator(Kenkyū-buntansha) AKIYAMA Tomohiro  Miyagi National College of Technology Mechanical Engineering Associate Professor, 助教授 (50175808)
KOBAYASHI Saburo  Tohoku university Institute for Advanced Materials Processing Associate Professo, 素材工学研究所, 助教授 (60006038)
Project Period (FY) 1997 – 1998
KeywordsCombustion Synthesis / Metal Hydride / Intermetallics / Reaction mechanism / Activation Process / Intermediate Product
Research Abstract

The intermetallic compound of Mg_2Ni has been regarded as one of the most attractive hydrogen storage alloys because of very high hydrogen absorbing quantity of 3.6 mass %. However, conventional production system of Mg_2Ni has two less productive processes which are several times remeltings and activation process. To overcome these problems, combustion synthesis has been studied for producing directly Mg_2NiH_4 in this study. The result shows the successful synthesis of Mg_2zNiH_4, proposing combustion synthesis as one of the promising process. For realizing practical production of Mg_2NiH_4 in hydriding combustion synthesis, rates of hydriding and dehydriding must be studied. For the first attempt for this purpose, reaction mechanism has been studied in hydriding and dehydriding combustion synthesis of Mg_2NiH_4, by using PTC apparatus, DSC and in situ X-ray diffractometer. Nine reactions in this process were obtained for two cycles of heating and cooling in hydrogen pressure of 1.0 MPa as follows.
In the first cycle ; (1) Mg+H_2*MgH_2(partially), (2) MgH_2*Mg+H_2, (3) 2Mg+Ni-Mg_2Ni, in the heating period. and (4) Mg_2Ni+2H_2*Mg_2NiH_4(HT), partially (5) Mg_2NiH_4(HT)*Mg_2NiH_4(LT), in the cooling period. In the second cycle ; (6) Mg_2NiH_4(LT)*MMg_2NiH_4(HT), (7) Mg_2NiH_4(HT)*Mg_2Ni+2H_2, in the heating period. and (8) Mg_2Ni+2H_2*Mg_2NiH_4 (HT) partially, (9) Mg2NiH4 T)*Mg_2NiH_4(LT), in the cooling period.
The X-ray diffraction intensity of Mg_2NiH, after the second cycle of hydriding is 6 times of that after the first cycle of hydriding, although only one single phase of Mg_2Ni exists at 823K before the hydriding either the first cycle or the second cycle.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Liquan Li: "In situ X-ray diffraction study of the hydriding combustion synthesis of Mg_2NiH_4" Journal of Alloys and Compounds. 281. 175-180 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Liquan Li: "Hydriding and dehydriding behaviors of product in hydriding combustion synthesis- of Mg_2NiH_4" Journal of Alloys and Compounds. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Liquan Li: "In situ X-ray diffraction study of the hydriding combustion synthesis of Mg_2NiH_4" Journal of Alloys and Compounds. 281. 175-180 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Liquan Li: "Hydriding and dehydriding behaviors of product inhydriding combustion synthesis of Mg_2NiH_4" Journal of Alloys and Compounds. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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