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POWDER PRODUCTION BY HYDROGEN PULVERIZATION OF FUNCTIONAL INTERMETALLICS AND DEVELOPMENT OF CLOSED SYSTEM FOR POWDER CONSOLIDATION

Research Project

Project/Area Number 07555509
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Material processing/treatments
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

HANADA Shuji  TOHOKU UNIVERSITY,INSTITUTE FOR MATERIALS RESERACH,PROFESSOR, 金属材料研究所, 教授 (10005960)

Co-Investigator(Kenkyū-buntansha) MURAHASHI Noriaki  MITSUBISHI MATERIRALS,CENTRAL RESEARCH INSTITUTIE,RESERACHER, 中央研究所, 研究員
KONO Toru  MITSUBISHI MATERIRALS,CENTRAL RESEARCH INSTITUTIE,VICE DIRECTOR, 中央研究所, 副所長
YOSHIMI Kyosuke  TOHOKU UNIVERSITY,INSTITUTE FOR MATERIALS RESERACH,RESEARCH ASSOCIATE, 金属材料研究所, 助手 (80230803)
MURAYAMA Yonosuke  TOHOKU UNIVERSITY,INSTITUTE FOR MATERIALS RESERACH,RESEARCH ASSOCIATE, 金属材料研究所, 助手 (60111308)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1997: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordsintermetallic compound / hydrogen absorbing alloy / pulverization / pressure-hydrogen content-isotherm / microstructure control / powder metallurgy process / 圧力-水素-組成等温線図 / 圧力-水素組成等温線図
Research Abstract

In order to develop a powder production process of structural intermetallics via hydrogen pulverization and to improve cycling lifetime of hydrogen absorption and desorption in hydrogen absorbing intermetallics, hydrogen pulverization mechanisms have been investigated using Nb_3Al and NbCr_2 base intermetallic alloys. Since the ability of hydrogen absorption is sensitive to the surface oxide film covering intermetallics, all samples were prepared without exposing to air in a specially designed closed system. In this system a glove box is attached to a vacuum furnace. Hydrogen absorption-desorption curves were measured, lattice constants were calculated before and after hydrogenation, and shape and size of pulverized particles were observed by optical and scanning electron microscopy. In Nb-Al binary alloys pulverization occurs only in two phase alloys, Nb_3Al/Nb and Nb_3Al/Nb_2AI.Monolithic Nb_3AI, Nb_2A1 and Nb are not pulverized, although they can absorb a considerable amount of hydrogen. In Nb-Cr binary alloys, only Nb solid solution can absorb hydrogen among constituent phases, Nb, NbCr_2, and Cr. Pulverization takes place only in Nb/NbCr_2 two phase alloys. When NbCr_2 is alloyed with Ti, it can absorb hydrogen. Ti-containing monolithic NbCr_2 is pulverized by hydrogenation. From these results, it is concluded that pulverization is initiated at a crack in an intermetallic compound which is caused by difference in dilatation either of both phases accompanied with hydrogen absorption or of surface and interior generated by a gradient of hydrogen content.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 千星聡、細田秀樹、花田修治: "Nb_3Al基合金の水素処理による微粉化に及ぼす第二相の影響" 日本金属学会誌. 61. 1132-1138 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Semboshi, T.Tabaru, S.Hanada: "Effect of microstructure on hydrogen pulverization of Nb_3Al/Nb two phese alloys" Intermetallies. 6. 61-69 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小菅真朗、細田秀樹、花田修治: "水素処理によるNb-Cr合金粉末の作製" 日本金属学会誌. 62. 681-689 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Hosoda, S.Hanada: "Hydrogen absorption of Nb-Al alloy balk specimens" J.Alloys and Compounds. 281. 268-274 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Hanada and H.Hosoda: "Hydrogen pulverization of Nb_3Al and NbCr_2 alloys" Ordered Intermetallic Alloys and Composites. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Semboshi, H.Hosoda and S.Hanada: "Effects second phases on the pulverization of Nb_3Al-Base alloys by hydrogenation" J.Japan Inst.Metals. 61. 1132-1138 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Hosoda, S.Semboshi and S.Hanada: "Powder preparation by hydrogenation of Nb-Al allooys" Proc.Inter.symp.Designing, Processing and Properties of Advanced Engineering Materials. 307-312 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Semboshi, T.Tabaru, H.Hosoda and S.Hanada: "Effect of microsturucture on hydrogen pulverization of Nb_3Al/Nb two phase alloys" Intermetallics. 6. 61-69 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Kosuge, H.Hosoda and S.Hanada: "Preparation of Nb-Cr Alloy powder by hydrogenation" J.Japan Inst.Metals. 62. 681-689 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Hosoda, T.Tabaru, S.Semboshi, and S.Hanada: "Hydrogen absorption of Nb-Al allooy bulk specimens" J.Alloys and Compounds. 281. 268-274 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Hanada and H.Hosoda: "Hydrogen pulverization of Nb_3Al and NbCr_2 alloys" Proc.3rd Intern.Workshop on Ordered Intermetallic Alloys and Composites. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Semboshi, T.Tabaru, H.Hosoda & S.Hanada: "Effect of microstructure on hydrogen pulverization on Nb_3Al/Nb two phase alloys" Intermetallics. 6・1. 61-69 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 千星 聡、細田秀樹、花田修治: "Nb_3Al基合金の水素処理による微粉化に及ぼす第二相の影響" 日本金属学会誌. 61・10. 1132-1138 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Hosoda, S.Semboshi and S.Hanada: "Powder preparation by Hydrogenation of Nb-Al alloys." Designing,Processing and Properties of Advanced Engineering Materials. in press).

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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