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Gas leakage through C/C composite and its suppression technology

Research Project

Project/Area Number 16360338
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Composite materials/Physical properties
Research InstitutionJapan Aerospace Exploration Agency

Principal Investigator

HATTA Hiroshi  Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Division of Space structure and materials, Professor, 宇宙科学研究本部 宇宙構造・材料工学研究系, 教授 (90095638)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥12,300,000 (Direct Cost: ¥12,300,000)
Fiscal Year 2005: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥8,800,000 (Direct Cost: ¥8,800,000)
KeywordsC / C composite / Gas leakage / Air tight chamber / Thermal expansion mismatch / Crack / Si impregnation / Sol-gel method / CVI
Research Abstract

Carbon fiber reinforced carbon matrix composites (C/Cs) are porous materials including voids, cracks, and interfacial debonding between the fiber and matrix. Hence, in applications of C/Cs to airtight hot structures such as heat exchangers, the gas leakage becomes serious problem. However, within author's best knowledge, few studies has treated this problem, and essentially no discussion has been performed on gas leak mechanisms and measures to minimize gas leak rate.
In the present study, the following discussion was performed ;
1. A test fixture capable of high temperature measurement of gas leak rates was designed, and fabricated.
2. In order to fill the defects in C/Cs, molten Si was infiltrated, and filled Si was converted to SiC by chemical reaction with carbon in C/Cs.
3. Cracks in C/Cs have tendency to be closing with temperature rise, so that additional measures which can be done under low temperature environment were attempted.
The results obtained in the present research were as follows ;
1. A test fixture capable of high temperature gas leak rate measurements up to 800゜C of gas leak rates was designed, and fabricated.
2. The Si impregnation resulted in decreasing gas leak rate to 1/10.
3. As low temperature methods, carbon infiltration by HIP (hot isostatic pressure), glass formation by the sol-gel method, and glass coating by the sol-gel method were examined after the Si impregnation. The first method resulted in slight lowering of gas leak rate, the second and third treatments yielded less gas leak rates over 1/10 compared with Si impregnated C/Cs. Thus, this study established technology lowering gas leak rate through C/Cs less than 1/1000 compared with non-treated C/Cs.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (8 results)

All 2005 2004

All Journal Article (8 results)

  • [Journal Article] Key C/C technologies required for building up an engine structure for a reusable space vehicle2005

    • Author(s)
      Hiroshi Hatta
    • Journal Title

      Proc. USA France and Japan Carbon-Carbon Composites Technology Exchange Workshop CD ROM

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High temperature bonding techniques applied for Carbon Carbon composite using Carbon and SiC2005

    • Author(s)
      Masashi Koyama, Kosuke Ishii, Hiroshi Hatta
    • Journal Title

      Proc. International Conference on Interfaces & Interphases in Multicomponent Materials CD ROM

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Key C/C Technologies Required for Building up an Engine Structure for a Reusable Space Vehicle2005

    • Author(s)
      Hiroshi Hatta
    • Journal Title

      Proc USA, France, Japan Carbon-Carbon Composites Technical Exchange Meeting

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High temperature bonding techniques applied for Carbon Carbon composite using Carbon and Sic2005

    • Author(s)
      Masashi Koyama, Kosuke Ishii, Hiroshi Hatta
    • Journal Title

      Proc.International Conference on Interfaces & Interphases in Multicomponent Materials

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Key C/C technologies required for building up an engine structure for a reusable space vehicle2005

    • Author(s)
      Hiroshi Hatta
    • Journal Title

      Proc. USA France and Japan Carbon-Carbon Composites Technology Exchange Workshop (submitted)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Prevention of Gas Leakage through C/C Composites by Si Impregnation2004

    • Author(s)
      Y.Kutsuwada, H.Hatta, H.Fukuda
    • Journal Title

      Proc. 5TH JOINT CANADA-JAPAN WORKSHOP ON COMPOSITES, 2004 CD ROM

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Prevention of Gas Leakage through C/C Composites by Si Impregnation,2004

    • Author(s)
      Yasuhiro Kutsuwada, Hiroshi Hatta, Hiroshi Fukuda
    • Journal Title

      Proc.5TH JOINT CANADA-JAPAN WORKSHOP ON COMPOSITES

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Prevention of Gas Leakage through C/C Composites by Si Impregnation2004

    • Author(s)
      Yasuhiro Kutsuwada, Hiroshi Hatta, Hiroshi Fukuda
    • Journal Title

      Proc.5th Canada-Japan Workshop on Composites

      Pages: 50-57

    • Related Report
      2004 Annual Research Report

URL: 

Published: 2004-04-01   Modified: 2016-04-21  

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