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BASIC PROPERTIES OF WHISKER CRYSTALS UNDER TENSION

Research Project

Project/Area Number 07650022
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionScience University of Tokyo

Principal Investigator

KISHI Kiyoshi  Science University of Tokyo, Assistant Professor, 理学部, 助教授 (90087354)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsWhiskers / Tensile Strength / Crystal Growth / Surface Structure / Thin Film / Interface Structure / Surface Tension / Reinforced Materials / 引張り強度 / 結晶の完全性 / 応力歪特性
Research Abstract

1. Spiral (or helical) copper whiskers am nearly perfect and show high ultimate tensile strength. These properties are the same as of straight whiskers, but the stress-strain curves are different. Spiral whiskers show no easy-glide region. After the first elastic region, the curve shows gradually out of linear. In this new region many very small but strongly deformed areas periodically occur. Then the deformed areas grow due to the increase in tension but whiskers still keep the high strength 2. Our mass-produced whiskers also show high ultimate tensile strength. 3. A strain-dependent multi-purpose tensile tester for small specimen is built and employed. A new concept of tensile- measurement instruments for nanometric size specimen is also postulated, 4. For both CVD metal whiskers and whiskers of water-soluble materials, a new growth mechanism of whisker crystals under surface tension is described together with computer-simulation. In the present process, the material is supplied via a surface liquid layer such as charges-halide melt or water solution. 5. Two new process of whisker fabrication-growth of water-soluble whiskers with foreign particles aiding the action of surface tension and VLS growth of ITO whiskers under electron shower- are described. 6. AFM observation shows thin {111} film of the charge halide covers the surface of CVD-grown copper whiskers with either epitaxial or CSL low-energy relationships possessing interface tension. 7. According to MD simulation, the {111} halide film already presence between the surface of growing copper whiskers and the top layer of halide-melt and changes the morphology of whiskers.

Report

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

    (11 results)

All Other

All Publications (11 results)

  • [Publications] K. Kishi et al.: "The Surface Structures of Spiral Cu Whiskers"Physics of Low-Dimensional Structures. 10-11. 157-164 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H. Yumoto, K. Kishi et al.: "VLS Growth of ITO Whiskers Prepared by the Electron Shower Method"Crystal Research Technology. 31. 159-164 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K. Kishi et al.: "Nucleation of Water-Soluble Whiskers"Bussei Kenkyu(Kyoto). 66. 614-615 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 岸清: "ひげ結晶とデンドライト"表面科学 (日本表面科学会誌). 17. 224-229 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Kishi et al.: "The Surface Structures of Spiral Cu Whiskers"Physics of Low-Dimensional Structures. 10-11. 157-164 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Yumoto,K.Kishi et al.: "VLS Growth of ITO Whiskers Perpared by the Electron Shower Method"Crystal Research Technology. 31. 159-164 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Kishi: "Nucleation of Water-Soluble Whiskers"Bussei-Kenkyu (Kyoto). 66. 614-615 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Kishi: "Whisker Crystals and Dendrites (in Japanese)"Journal of the Surface Science Society of Japan. 17. 224-229 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 岸 清: "ひげ結晶とデンドライト" 表面科学. 17. 224-229 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K. Kishi et al.: "The Surface Structure of Spiral Cu Whiskers" Physics of Low-Dimensional Structures. 10/11. 157-164 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 岸 清: "ひげ結晶と樹枝状結晶" 表面科学. 17(印刷中). 5 (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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