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Structure and Properties of Mesophase-Pitch-Based Carbon Fibers

Research Project

Project/Area Number 63044067
Research Category

Grant-in-Aid for Overseas Scientific Survey.

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionToyohashi University of Technology

Principal Investigator

INAGAKI Michio  Professor, Toyohashi University of Technology, 工学部, 教授 (20023054)

Co-Investigator(Kenkyū-buntansha) A.R. Bunsell  パリ鉱物高等専門学校, 教授
A. Oberlin  ポー大学, マルセル・マシュー所究所, 所長
SAKAI Mototsugu  Associate Professor, Toyohashi University of Technology, 工学部, 助教授 (50124730)
YASUDA Eiichi  Professor, Tokyo Institute of Technology, 工業材料研究所, 教授 (70016830)
HISHIYAMA Yoshihiro  Professor, Musashi Instittute of Technology, 教授 (90061499)
OBERLIN Agnes  Director, Laboratoire Marcel Mathieu
BUNSELL Anthony R.  Professor, Ecole Superieur des Mines de Paris
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1989: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1988: ¥5,000,000 (Direct Cost: ¥5,000,000)
KeywordsMesophase / Microtexture / High-Resolution Electron Microscopy / Tensile Strength / Magnetoresistance / Thermal Expansion Coefficient / Weibull Distribution / Scanning electron microscopy
Research Abstract

The mesophase-pitch-based carbon fibers with different textures of radial with wedge(I-1), radia(I-2), random (I-3) and onion(I-4) types were supplied to all the members of this project after carbonization and graphitization at high temperatures. The structure and microtexture of the precursor pitch and rheological behavior of mesophase pitches were also studied.
From optical and high-resolution transmission electron microscopic observations, the precursor pitch was found to be bi-phasic, consisting of optically isotropic drops and anisotropic matrix. Even after spinning, carbonization, both phases remained individualized and after graphitization the former gave microporous non-graphitizing carbon and the latter yielded well-graphitized lamellae.
X-ray diffraction and magnetoresistance measurement agreed with the observations under optical and electron microscopes. The fiber I-1 having radial with wedge texture showed the highest degree of graphitization and largest crystallite sizes. Also it had the highest degree of orientation of carbon layers along the fiber axis.
Tensile breaking strength and Young's modulus, strain to break and also Weibull modulus were determined on four fibers carbonized and graphitized. The fiber I-1 had the highest strength and Young's modulus after graphitization. This results suggest hat the wedge in the fiber does not act as a crack for fracture and high degree of orientation of carbon layers along the fiber axis plays an important role to develop the strength. Weibull modulus decreased after graphitization, related to the large fluctuation in the strain to break.
Thermal expansion coefficients for graphitized carbon fibers were nearly the same at temperatures up to 1000 C. Cross-sectional microtexture of the fibers had only a little effect on the coefficent.

Report

(1 results)
  • 1989 Final Research Report Summary
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] K.Lafdi: "TEM Studies of coal Tar:Crude Tar abd its Insoluble Fractions" Carbon. 28. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 田辺靖博: "炭素繊維の熱膨張係数と配向関数" 炭素. 1988. 2-5 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.Iwashita: "Potential Change Lith Intercalation of Sulfuric Acid into Graphite by Chemical Oxidation" Carbon. 28. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Sato: "Viscous Flow of Carbon Black dispersed Pitches.The ependence on Temperature and Carbon Black Concentration" Carbon. 28. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Sakai: "Fracture Toughness and Fiber Bridging of Carbon Fiber-Reinforced Carbon Matrix Comporites" J.European Ceram.Soc.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 稲垣道夫: "Structure and Microtexture of Mesophase-Pitch-Based Carbon Fibers." 炭素.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K. Lafdi, S. Bonnamy and A. Oberlin: "TEM Studies of Coal Tar: Crude Tar and its Insoluble Fractions" Carbon. 28. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. Tanabe, E. Yasuda, H. Machino and S. Kimura: "Correlation between Thermal Expansion Coefficient and Orientation Function of Various Types of Carbon Fibers" Tanso. 1988. 2-5 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N. Iwashita and M. Inagaki: "Potential Change with Intercalation of Sulfuric Acid into Graphite by Chemical Oxidation" Carbon. 28. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. Sato, T. Kitano, M. Inagaki and M. Sakai: "Viscous Flow of Carbon Black Dispersed Pitches. The Dependence on Temperature and Carbon Black Concentration" Carbon. 28. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary

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Published: 1988-04-01   Modified: 2016-04-21  

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