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FABRICATION OF ULTRAFINE MICROSTRUCTURE MATERIALS BY SINTERING OF ULTRAFINE POWDERS AND EVALUATION OF THE PROPERTIES

Research Project

Project/Area Number 62550514
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

HAYASHI KOJI  THE UNIVERSITY OF TOKYO, THE INSTITUTE OF INDUSTRIAL SCIENCE, 生産技術研究所, 教授 (30011109)

Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1987: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsUltrafine powder / Iron / Nickel / Cobalt / Copper / Grain size / Hardness / Densification / 微細合金 / 微細粒合金 / 鉄粉 / ホットプレス / 加圧焼結 / 超微細粒鉄 / 緻密度 / 粒成長
Research Abstract

PROPERTIES OF MATERIALS CAN BE MODIFIED BY A CONTROL OF THE MICROSTRUCTURE AS WELL AS AN APPROPRIATE SELECTION OF THE COMPONENTS. REFINEMENT OF THE MATRIX GRAIN SIZE USUALLY RESULTS IN THE IMPROVEMENT ON ITS MECHANICAL, MAGNETIC AND OTHER PROPERTIES. THERE ARE WELL KNOWN MERHODS FOR THE REFINEMENT OF THE MATRIX GRAIN SIZE SUCH AS STRAIN-ANNEALING, RAPID SOLIDIFICATION AND ANNEALING OF AMORPHOUS MATERIALS. BESIDES THESE, THERE IS A SINTERING METHOD OF ULTRAFINE POWDERS. A BASIC STUDY HAS BEEN CONDUCTED BY THE PRESENT AUTHOR TO FIND OUT THE FABRICATING CONDITIONS FOR OBTAINING FINE GRAINED METALS AND ALLOYS BY THE SINTERING OF ULTRAFINE METAL POWDERS. IN THIS STUDY, THE LOWEST SINTERING TEMPERATURE (T^c_ FOR COMPLETE DNESIFICATION OF Fe, Co, Ni AND Cu ULTRAFINE METAL POWDERS (AVERAGE PARTICLE SIZE, 0.02-0.05 m; OXYGEN CONTENT, 6-15 mass%) WAS INVESTIGATED UNDER THE PRESSURE UP TO 400 MPa IN H_2 GAS, AND THE CRYSTAL GRAIN SIZE AND HARDNESS OF THE DENSE SINTERED COMPACTS WERE INVESTIGATED. IT WAS FOUND THAT T^c_ UNDER 400 MPa FOR Fe, Co, Ni AND Cu POWDERS WERE ABOUT 620, 670, 470 AND 470K, RESPECTIVELY, WHICH WERE 350-600K LOWER THAN THOSE UNDER O MPa. THE MINIMUM AVERAGE CRYSTAL GRAIN SIZES OF Fe, Co, Ni AND Cu DENSE SINTERED COMPACTS WERE AS SMALL AS ABOUT 0.08, 0.21, 0.12 AND 0.40 m, RESPECTIVELY. THE HIGHEST VALUES OF HARDNESS (Hv) OF THE SINTERED COMPACTS WERE ABOUT 600, 550, 550 AND 130, WHICH WERE EXTREMELY HIGH COMPARED WITH USUAL COARSE-GRAINED METALS. THE HALL-PETCH LINEAR RELATIONSHIP BETWEEN Hv AND THE INVERSE OF SQUARE ROOT OF GRAIN SIZE HOLD FOR EACH ELEMENT.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 林宏爾、木原宏: 日本金属学会誌. 52. 343-347 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] K.Hayashi.;H.Kihar.: Sintering 87,Proceedings of IISS Symposium. 1. 255-260 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 林宏爾、江藤浩之: 日本金属学会誌. 53. 221-226 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] KOJI HAYASHI; HIROSHI KIHARA: "DENSIFICATION AND GRAIN GROWTH OF IRON ULTRAFINE POWDER DURING PRESSURE-SINTERING" J. JAPAN INST. METALS. 52. 343-347 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] KOJI HAYASHI; HIROSHI KIHARA: "PRESSURE-SINTERING OF ULTRAFINE METAL FOWDERS" SINTERING 87, PROCEEDINGS OF THE INTERNATIONAL INSTITUTE FOR SCIENCE OF SINTERING SYMPOSIUM. 1. 255-260 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] KOJI HAYASHI; HIROYUKI ETO: "PRESSURE-SINTERING OF IRON, COBALT, NICKEL AND COPPER ULTRAFINE POWDERS AND THE CRYSTAL GRAIN SIZE AND HARDNESS OF THE COMPACTS" J. JAPAN INST. METALS. 53. 221-226 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 林宏爾、木原宏: 日本金属学会誌. 52. 343-347 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] K,Hayashi;H.Kihara: Sintering 87,Proceedings of IISS Symposium. 1. 255-260 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 林宏爾、江藤浩之: 日本金属学会誌. 53. 221-226 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 林宏爾,木原宏: 日本金属学会誌. 52. 343-347 (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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