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ENVIRONMENTAL DURABILITY OF STRUCTURAL CERAMICS IN HIGH-PRESSURE AND HIGH-TEMPERATURE WATER VAPOR

Research Project

Project/Area Number 08650998
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionYONAGO NATIONAL COLLEGE OF TECHNOLOGY

Principal Investigator

ODA Kohei  YONAGO NAT'I COLL TECH., DEPT MATER.SCI., PROFESSOR, 物質工学科, 教授 (90043611)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsCERAMICS / WATER VAPOR CORROSION / AQUEOUS CORROSION RESISTANCE / MICROSTRUCTURE / INTERGRANULAR CORROSION / ENVIRONMENTAL DEGRADATION / SILICA GLASS / SILICON CARBIDE / ファインセラミックス / 構造材料 / オートクレーブ / 充填率
Research Abstract

The corrosion behavior and strength degradation of structural ceramics in high-temperature and high-pressure water vapor, which coexists with the high-temprtature and high-pressure water, have been studied. The porpose of this study is to clarify the corrosion reaction and the forms of corrosion for typical non-oxide and oxide ceramics in such environments, to evaluate the corrosion resistance and the environmental strength for these ceramics, and to present the suggestions for the material design and the material improvement.
Silica glass and silicon carbide ceramics were used as the test samples.Corrosion tests were conducted hydrothermally in saturated water vapor at 300゚C for 1-10 d. The weight change before and after corrosion of the sample, XRD analysis of the surface for the corroded sample, the solution analysis by ICP-AES,SEM observation and EDX analysis of the corroded sample, and the fracture strength of the sample before and after corrosion by 3-point bending test, were measured.
The following results were obtained.
(1) Corrosion rates of silica glass and sic ceramics in saturated water vapor at 300゚C is higher than those in water.
(2) Intergranular corrosion proceeded in the SiC ceramics by preferential attack at the grain boundaries.
(3) The fracture strength of silica glass agter corrosion rised up with increasing duration time, because the viscosity of silica glass was reduced due to the permeation of water. The fracture strength of SiC ceramics after corrosion was reduced by about 80% of the initial strength.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 小田 耕平: "300℃の高圧水蒸気中における石英ガラスの腐食挙動" 岡山大学環境工学部研究報告書. 第2巻・第1号. 131-135 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小田 耕平: "構造用セラミックスの高温水中における化学的耐久性" 材料と環境'97講演集. 123-126 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小田 耕平: "酸化物セラミックスの塩素・塩化水素ガラスによる高温腐食" 材料と環境. 46巻・11号. 736-738 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小田 耕平: "Hydrothermal Corrosion of Alumina Ceramics" Jourmal of American Ceramic Society. 80巻・12号. 3223-3236 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小田 耕平: "SiCセラミックスの300℃の飽和水蒸気中における耐環境特性" 第36回セラミックス基礎科学討論会講演予稿集. 100-101 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KOHEI ODA: "Corrosion Behavior of Silica Glass in High-Pressure Water Vapor at 300゚C" The Journal of The Faculty of Environmental Science and Technology. Vol.2. 131-135 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KOHEI ODA: "Corrosion Resistance of Structural Ceramics in High-Temperature Water" Proceedings of the Meetings on the Zairyo-to-Kankyo'97, Tokyo May 5th-8th. 123-126 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KOHEI ODA: "High Temperature Corrosion of Oxide Ceramics in Chlorine and Hydrogen Chloride Gases" Zairyo-to-Kankyo. Vol.45. 736-738 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KOHEI ODA: "Hydrothermal Corrosion of Alumina Ceramics" Journal of the American Ceramic Society. Vol.80. 3233-3236 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KOHEI ODA: "Corrosion Behavior of SiC Ceramics in Saturated Water Vapor at 300゚C" Proceedings of the Meetings on the Basic Science for Ceramics, Sendai Jan.20th-21st. 100-101 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小田耕平: "Hydrothermal Corrosion of Alumina Ceramics" Journal of American Ceramic Society. 80・12. 3233-3236 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小田耕平: "SiCセラミックスの300℃の飽和水蒸気中における耐環境特性" 第36回セラミックス基礎科学討論会講演要旨集. 100-101 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小田耕平・高田勝美・吉尾哲夫: "300℃の高圧水蒸気中における石英ガラスの腐食挙動" 岡山大学環境理工学部研究報告. 第2巻・第1号. 131-135 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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