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1994 Fiscal Year Final Research Report Summary

CHARACTERISTICS OF PRECURSOR CERAMIC FIBER UNDER SEVERE ENVIRONMENTS

Research Project

Project/Area Number 05650642
Research Category

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

Allocation TypeSingle-year Grants
Research Field Inorganic materials/Physical properties
Research InstitutionUNIVERSITY OF OSAKA PREFECTURE

Principal Investigator

OKAMURA Kiyohito  UNIVERSITY OF OSAKA PREFECTURE,COLLEGE OF ENGINEERING, 工学部, 教授 (70005974)

Co-Investigator(Kenkyū-buntansha) SHIMOO Toshio  UNIVERSITY OF OSAKA PREFECTURE,COLLEGE OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (10081374)
Project Period (FY) 1993 – 1994
KeywordsPrecursor ceramic fiber / Severe environment properties / Silicon carbide ceramics / Composites / Mechanical properties / High-temperature pyrolysis / Inorganic polymer / Amorphous
Research Abstract

Precursor ceramic fibers have been produced from inorganic polymers as the precursor. Its process is melt-spinning of precursor polymer, curing and heat treatment. The fibers are amorphous and continuous fine fibers, and they have heat resistance and high tensile strength. The fibers have been expected as the reinforcement of ceramic matrix composites. The fibers contain large quantities of oxygen (more than 10wt%) coming from fiber-precessing of the oxidation-curing, but low-oxygen-type fibers (less than 1wt%) have been recently developed by curing with radiation crosslink. In this research work, mechanical properties, oxidation mechanism and high-temperature pyrolytic mechanism of the precursor fibers have been studied under the severe invironments of inert and oxidation atmosphere at temperatures of 1300゚-1800゚C,using high-temperature furnace prepared by the GRANT-IN-AID FOR SCIENTIFIC RESEARCH (C).
Precursor ceramic fibers with lower oxygen contents were pyrolyzed more slowly when h … More eated in an Ar atmosphere, and SiO and CO gases evolution of the fibers due to the high temperature pyrolysis were suppressed, significantly retaining their original high strength in the comparison with that of high oxygen-contained fibers. The fibers heat-treated in a N_2 atmosphere at temperatures below 1500゚C have higher strength and Young's modulus than that treated in an Ar, because of a formation of the nitride layr on fiber surface.
On the other hand, the oxidation rate of the fibers followed the contracting-disc formula for diffusion control. The oxidation is considered to be controlled by the gaseous diffusion through the micropores in the silica film. The oxide film formed on the fiber surface suppressed high-temperature pyrolysis and provide considerable high-temperature strength. When the low-oxygen-types fibers were coated with more thin oxide layr in thickness, the hyrolysis of the fibers was suppressed significantly. The crystl structure in the core of the fibers changed from amorphous to beta-SiC microcrystallines. The tensile strength and Young's modulus were fairly improved by coating thin oxide layrs.
These above research results are considered to be very effective for the development of precursor ceramic fibers and the the fibers reinforced ceramic matrix composites. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] T.Shimoo: "High-Temperature Stability of Nicalon under Ar or 0_2 Atmosphere" J.Mater.Sci.29. 456-463 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 柿本健一: "表面酸化被覆層によるSi-Ti-C-O系繊維の熱分解抑制に及ぼす酸素濃度の影響" J.Ceram.Soc.Japan. 102. 482-487 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下尾聰夫: "N_2雰囲気下における低酸素SiC繊維の高温熱分解" J.Ceram.Soc.Japan. 102. 1142-1147 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shimoo: "Mechanism of Oxidation of Low-Oxygen SiC Fiber Prepared by Electron Radiation Curing Method" J.Ceram.Soc.Japan. 102. 617-622 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 柿本健一: "電子線照射により不融化したSi-Ti-C-O系繊維の高温結晶化過程" 日本金属学会誌. 58. 229-234 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kakimoto: "The Oxidation Behavior of Si-Ti-C-O Fiber with a Low Oxygen Content" J.Ceram.Soc.Japan. 103(in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡村清人: "先進セラミックス,基礎と応用,「長繊維」" 日刊工業新聞社, 11 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shimoo, H.Chen, K.Okamura: "High-Temperature Stability of Nicalon under Ar or O_2 Atmosphere" J.Mater.Sci.29. 456-463 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kakimoto, T.Shimoo, K.Okamura: "The Effect of Oxygen Content on Pyrolysis-Suppression of Si-Ti-C-O Fibers Coated with Surface Oxide Layrs" J.Ceram.Soc.Japan. 102. 482-487 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shimoo, T.Hayatsu, M.Tadeda, H.Ichikawa, T.Seguchi and K.Okamura: "High-Temperature Decomposition of Low-Oxygen SiC Fiber under N_2Atmosphere" J.Ceram.Soc.Japan. 102. 1142-1147 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shimoo, T.Hayatsu, M.Tadeda, H.Ichikawa, T.Seguchi K.Okamura: "Mechanism of Oxidation of Low-Oxygen SiC Fiber Prepared by Electron Radiation Curing Method" J.Ceram.Soc.Japan. 102. 617-622 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kakimoto, T.Shimoo, K.Okamura, T.Seguchi M.Sato, K.Kumagawa and T.Yamamura: "High-Temperature Crystallization Behavior of Si-Ti-C-O Fiber Cured by Electron Beam Irradiation" J.Japan 1nst.Metals. 58. 229-234 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kakimoto, T.Shimoo, and K.Okumura: "The Oxidation Behavior of Si-Ti-C-O Fiber with a Low Oxygen Content" J.Ceram.Soc.Japan. 103 (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Okamura: Advanced Ceramics, Basics and Application, "Long Fiber". NIKKAN-KOUGYOU-SHINNBUN, 11 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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