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Preparation and Property Evalution of Ultrafinegrained Materials by Ultra-High Pressure Sintering

Research Project

Project/Area Number 02452238
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属加工(含鋳造)
Research InstitutionThe University of Tokyo, Institute of Industrial Science

Principal Investigator

HAYASHI Koji  The University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (30011109)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥4,100,000 (Direct Cost: ¥4,100,000)
KeywordsUltrafine Powder / Fine Grain / Micro Grain / Pressure Sintering / Hardness / Elevated Temperature / Creep / 焼結 / 極微細組織 / クリ-プ変形 / 鉄 / コバルト / ニッケル / 超微細粒 / 緻密化
Research Abstract

The hot-pressing condition for complete densification of Co+Ni and Fe+Co+Ni mixed ultrafine powders (0.02 ; mum), the average crystal grain size and hardness (Hv) of the sintered compacts were investigated (Research I) and the effect of test temperature on the hardness (Hv) of ultrafinegrained sintered compacts with the average crystal grain size of 0.10 0.35mum was investigated for Fe, Co, Ni, Fe-Co, Fe-Ni, Go-Ni and Fe-Co-Ni systems (Research II). The results obtained were as follows. Research I ; (1) The complete densification temperatures for Fe+Co+Ni mixed powders, for example at 400 MPa, was about 200-300K higher than those (500-800K) of Fe, Co and Ni powders, and about 100K higher than those of Co+Ni, Fe+Co and Fe+Ni powders. (2) The minimum crystal grain size of the Co-Ni and Fe-Co-Ni sintered compacts were 0.18 and 0.12 um respectively ; the crystal grain size under the same hot-pressing condition tended to decrease with the number of components, in accordance with the tendencies of both the homogenization temperature of the components and the densification temperature. (3) The maximum hardness of Co-Ni and Fe-Co-Ni sintered compacts were about 600 and 800 Hv. Research II ; . (1) The order of Hv observed at room temperature among the alloy systems did not change in general at the higher test temperatures. (2) The Hv of Fe fine-grained compacts decreased sharply at about 500K, which was much lower than that (about 800K) for coarse-grained compacts of 3.5um. This was attributed to the fact that creep deformation easily occurs even at such low temperatures for fine-grained compacts.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 藤内 秀人,林 広爾: "Co+Ni,Fe+Co+Ni混合超微粉の加圧焼結および焼結体の粒度と硬さ" 粉体およ粉未冶金. 38. 482-485 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 藤内 秀人,林 広爾: "Fe,Co,Ni単成分および混合超微粉焼結体の硬さの試験温度依存性" 粉体および粉未冶金. 38. 854-857 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] HIDEHITO FUJIUCHI AND KOJI HAYASHI: "Hot-Pressing of Co+Ni and Fe+Co+Ni Mixed ultrafine Powders and Grain Size and Hardness of Sintered Compact" J. Japan Inst. Powder Met.38. 482-485 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] HIDEHITO FUJIUCHI AND KOJI HAYASHI: "Test Temperature Dependence of Hardness of Fe, Co, Ni and Their Mixed Ultrafine Power Sintered Compacts" J. Japan Inst. Powder Met.38. 854-857 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 藤内 秀人,林 宏爾: "Co+Ni,Fe+Co+Ni混合超微粉の加圧焼結および焼結体の粒度と硬さ" 粉体および粉末冶金. 38. 482-485 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 藤内 秀人,林 宏爾: "Fe,Co,Ni単成分および混合超微粉焼結体の試験温度依存性" 粉体および粉末冶金. 38. 854-857 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 藤内 秀人、林 宏爾: "Co+NiとFe+Co+Ni混合超微粉の加圧焼結と焼結体の粒度と硬さ" 粉体および粉末冶金. 38. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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