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Development of Rapid Sintering Technique on Metal Powder by Considering the Saving Energy and Environmental Pollution Plan

Research Project

Project/Area Number 11650729
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionIwate University

Principal Investigator

NAKAMURA Mitsuru  Iwate Univ., Engineering, Associate Professor, 工学部, 助教授 (60237435)

Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsRapid sintering technique / High frequency induction method / Carbon steel / High strength-alloyed steel / vacuum condition / decarburized layer / Radial crushing strength / Total evaluation / 高速焼結技術 / 焼結高強度合金網網 / 焼結炭素鋼 / 窒素雰囲気ガス / 窒素-水素雰囲気ガス / 鉄化合物 / 恒温保持処理 / 圧環強さ / 吸着ガス
Research Abstract

This research was purposed by rapid sintering process used the high frequency heating instrument that compared to conventional sintering furnace. Rapid sintering technique within a few minutes is to investigate 2 types of steels (carbon steel and high strength-alloyed steels). And, the research atmosphere changed to 3 types of vacuum, nitrogen and nitrogen-hydrogen. The results were obtained as follows.
1 Case of carbon steel under vacuum condition
There is very important factor both the removal of adsorbed gas in powder grain surface and accompanied by the diffusion and sintering of each powder. The isothermal treatment when the sintering process in this experiment was a key technology treatment. This method was finished to sinter only 3 minutes, and it's condition was maximum heating time-30 s, sintering condition 1523 K-60 s and isothermal treatment-90 s holding only.
2 Case of carbon steel under nitrogen gas atmosphere condition
It was important to release an adsorbed gas in iron powde … More r particle surface. The product of decarburized layer on specimen surface was a problem because of reduces of mechanical properties. This method was finished to sinter only 3.5 minutes, and the radial crushing strength (RCS) was obtained almost same value compared to conventional furnace method.
3 Case of carbon steel under nitrogen-hydrogen gas atmosphere condition
In the case, added low H2 gas concentration from 1 to 2 %, RCS and prevention of decaburization were almost same values compared to rapid sintering of 100 % N2 gas atmosphere. This lowering tendency of RCS was caused to form FeOOH compound by the present of H2 gas and this compound prevented to diffusion of Cu elements.
4 Case of high strength-alloyed steel under vacuum condition
This rapid sintering needs to control the degassing, diffusion of additional alloying elements and form a Martensite or Bainite structure in matrix and these are very important factor for the sintering process. It can be understood that this sintering process needs the highest sintering temperature compared with conventional furnace process but obtained comparatively higher RCS by changing the holding time. This process took only 3〜4 minutes for holding time, in spite of high strength-alloyed steel required longer time for diffusion of additional alloying elements. Less

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 中村 満, 千田法明他2名: "誘導加熱法による炭素鋼の急速焼結技術の開発"粉体および粉末冶金. 46-5. 538-543 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 中村 満, 梅村 崇他2名: "誘導加熱法による窒素雰囲気下での炭素鋼の急速焼結(第2報)"粉体および粉末冶金. 48-1. 87-93 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 中村 満, 梅村 崇他3名: "誘導加熱法による窒素-水素雰囲気下での炭素鋼の急速焼結(第3法)"粉体および粉末冶金. 48-7. 594-599 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 中村 満, 高橋弘美他1名: "誘導加熱法を用いた高強度合金鋼の急速焼結"粉体および粉末冶金. 49-6(掲載決定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 中村 満, 梅村 崇他2名: "誘導加熱法による窒素-水素雰囲気下での炭素網の急速焼結(第3法)"粉体および粉末冶金. 48-7. 594-599 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 中村 満, 高橋弘美他1名: "誘導加熱法を用いた高強度合金網の急速焼結"粉体および粉末冶金. 掲載決定 49-6. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 中村満,梅村崇 他2名: "誘導加熱法による窒素雰囲気下での炭素鋼の急速焼結(第2法)"粉体および粉末冶金. 48-1. 87-93 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 中村満,梅村崇 他3名: "誘導加熱法による窒素-水素雰囲気下での炭素鋼の急速焼結(第3法)"粉体および粉末冶金. (掲載決定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 中村 満: "誘導焼結法による炭素鋼の急速焼結技術の開発"粉体および粉末冶金. 46-5. 538-543 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村 満: "焼結炭素鋼の各種物性に及ぼす雰囲気ガスの影響"粉体および粉末冶金. 46-7. 727-734 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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