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Reliability Assurance of Machined Ceramics Number by Application of Crack-healing

Research Project

Project/Area Number 17360048
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionYokohama National University

Principal Investigator

ANDO Kotoji  Yokohama National University, Faculty of Engineering, Professor, 大学院工学研究院, 教授 (40017992)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Koji  Yokohama National University, Faculty of Engineering, Associate Professor, 大学院工学研究院, 助教授 (90334630)
NAKAO Wataru  Yokohama National University, Faculty of Engineering, Assistant, 大学院工学研究院, 助手 (60361870)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2006: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥11,800,000 (Direct Cost: ¥11,800,000)
KeywordsSelf crack-healing / Ceramics / Machining / Complete strength recovery / Reliability / High temperature strength / High temperature fatigue strength / Machining efficiency / 複合材 / 加工コスト
Research Abstract

Ceramics have been used in various fields as machined components. In particular, Alumina and Silicon Nitride is expected to be employed in structural components operating at high temperatures in various atmospheres, because of its excellent mechanical properties and oxidation resistance. However, ceramics has low fracture toughness, resulting in numerous surface cracks due to machining. Post machining operations, such as polishing and lapping, together with nondestructive inspection, are generally performed to remove the non-acceptable flaws. Although these techniques are very costly, they cannot eliminate minute flaws. Thus, the reliability of the ceramic components cannot be secured. If such cracks can be healed, ceramic components can offer improved reliability without costly final machining. In this study, silicon nitride / SiC particle, alumina/ SiC particle and alumina/ SiC whiskers composites were sintered and the crack-healing behavior for the cracks caused by machining was inv … More estigated. Small bending specimens (22×4×3 mm) were made. These specimens were machined hardly into various machined figuration so that they have various stress concentration factors replicate those of components. The machined specimens were crack-healed under various conditions. The fracture stress and the cyclic fatigue limit of these specimens after crack-healing were evaluated systematically. The conclusions were obtained as followed :
(1)Numerous cracks were introduced during heavily machining, as a result, the strength of Silicon Nitride / SiC particle, alumina/ SiC particle and alumina/ SiC whiskers composite reduced by 50 〜 80% compared to the polished samples. However, complete strength recovery was attained by crack-healing at 1400℃ for 10 h.
(2)In the case for alumina/ SiC particle and alumina/ SiC whiskers composite, Crack-healed zones exhibited the same strength as base material up to 1300 ℃, and exhibited the same levels of cyclic fatigue strength as the pristine, base material at 900 ° and 1100 ℃.
(3)In the case of silicon nitride / SiC particle composite, the bending strength of healed machined sample exhibited approximately 700 MPa from RT to 1400 ℃. Moreover, cyclic fatigue strength at 800℃, 1000℃, 1200℃ and 1300℃ were found to be 700MPa, 650MPa, 600MPa and 550MPa. Thus, it was found that healed machined silicon nitride exhibit high cyclic fatigue strength and reliability at high temperature.
These results have demonstrated that crack-healing is a highly effective technique which may potentially reduce machining costs and improve the structural integrity of machined ceramics Less

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (23 results)

All 2007 2006 2005 Other

All Journal Article (23 results)

  • [Journal Article] Strength Recovery Behavior of Machined Al_2O_3/SiC Nano-composite Ceramics by Crack-healing2007

    • Author(s)
      T.Osada, K.Ando 他3名
    • Journal Title

      Journal of the European Ceramic Society 27

      Pages: 3261-3267

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] き裂治癒によるアルミナ/炭化ケイ素ウィスカー機械加工材の強度回復挙動2007

    • Author(s)
      長田俊郎, 安藤柱 他3名
    • Journal Title

      日本セラミックス協会 115・4

      Pages: 278-284

    • NAID

      110006242770

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Strength recovery of machined Al_2O_3/SiC composite ceramics by crack-healing2007

    • Author(s)
      M.Masato, K.Ando 他2名
    • Journal Title

      Fatigue & Fracture of Engineering Materials & Structures 30・7

      Pages: 599-607

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Strength Recovery Behavior of Machined Al_2O_3/SiC Nano-composite Ceramics by Crack-healing2007

    • Author(s)
      T.Osada, K.Ando et al.
    • Journal Title

      Journal of the European Ceramic Society 27

      Pages: 3260-3267

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Strength Recovery Behavior of Machined Alumina/ SiC Whisker Composite by Crack-healing2007

    • Author(s)
      T.Osada, K.Ando et al.
    • Journal Title

      Journal of the Ceramics Society of Japan 115-4

      Pages: 278-284

    • NAID

      110006242770

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] き裂治癒によるアルミナ/炭化ケー素ウィスカー機械加工材の強度回復挙動2007

    • Author(s)
      長田俊郎, 安藤柱 他3名
    • Journal Title

      日本セラミックス協会誌 (印刷中)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] き裂治癒と保証試験によるアルミナ/炭化ケイ素複合材の強度向上と信頼性保証2006

    • Author(s)
      斧督人, 安藤柱 他3名
    • Journal Title

      高圧力技術協会 44・2

      Pages: 14-24

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] A Methodology to Increase Strength and Guarantee Reliability of Al_2O_3/ SiC Composite Ceramics Component by Crack-Healing and Proof Testing2006

    • Author(s)
      M.Ono
    • Journal Title

      Journal of the High Pressure Institute of Japan Vol.44, No.2

      Pages: 14-24

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] き裂治癒と保証試験によるアルミナ/炭化ケイ素複合材の強度向上と信頼性保証2006

    • Author(s)
      斧督人, 安藤柱 他3名
    • Journal Title

      圧力技術 44・2

      Pages: 80-89

    • Related Report
      2006 Annual Research Report
  • [Journal Article] き裂治癒と保証試験によるアルミナ/炭化ケイ素複合材の強度工場と信頼性保証2006

    • Author(s)
      斧督人, 安藤柱, 他3名
    • Journal Title

      圧力技術協会 44・2

      Pages: 14-24

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Improvement in Working Limit for Ceramics Components by Using Crack-Heal2006

    • Author(s)
      W.NAKAO, K.ANDO, 他3名
    • Journal Title

      Proceedings of the 13^<th> International conference & Exposition on Advanced Ceramics & Composites, Cocoa Beach, USA (CD ROM)

      Pages: 112-112

    • Related Report
      2005 Annual Research Report
  • [Journal Article] [Crack-Healing +Proof test + In-situ Crack-Healing]:A New Methodology to Guarantee the Structural Integrity of Ceramics Components2005

    • Author(s)
      K.ANDO, 他4名
    • Journal Title

      Proceedings of the 13^<th> JSME materials and proceedings conference, Seattle, USA (CD ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] (Crack-Healing + Proof test) a New Methodology to Guarantee the reliability of a Ceramics Component2005

    • Author(s)
      M.ONO, K.ANDO, 他3名
    • Journal Title

      Proceedings of the 13^<th> JSME materials and proceedings conference, Seattle, USA (CD ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 強加工された窒化ケイ素/炭化ケイ素複合材のき裂治癒による強度回復

    • Author(s)
      鄭永順, 安藤柱, 他3名
    • Journal Title

      ばね論文集 (印刷中)

    • NAID

      130004447713

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Crack-healing behavior and resultant high-temperature fatigue strength of machined Si_3N_4/ SiC composite ceramic

    • Author(s)
      Y.S.Jung, K.Ando, 他4名
    • Journal Title

      Fatigue & Fracture of Engineering Materials & Structures (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Strength Recovery of Heavily Machined Si_3N4_/ SiC Composite Ceramic by Crack-Healing

    • Author(s)
      Y.S.Jung, K.Ando et al.
    • Journal Title

      Transactions of Japan Society of Spring Engineers (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Crack-healing behavior and resultant high-temperature fatigue strength of machined Si_3N_4/ SiC composite ceramic

    • Author(s)
      Y.S.Jung, K.Ando et al.
    • Journal Title

      Fatigue & Fracture of Engineering Materials & Structures (submitted)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Ando Strength recovery of machined Al_2O_3/SiC composite ceramics by crack-healing

    • Author(s)
      M.Masato, K.
    • Journal Title

      Fatigue & Fracture of Engineering Materials & Structures (submitted)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Strength Recovery Behavior of Machined Al_2O_3/Sic Nano-composite Ceramics by Crack-healing

    • Author(s)
      T.Osada, K.Ando 他3名
    • Journal Title

      Journal of the European Ceramin Society (印刷中)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Crack-healing behavior and resultant high-temperature fatigys strength of machined Si_3N_4/Sic composite ceramic

    • Author(s)
      Y.S.Jung, K.Ando, 他4名
    • Journal Title

      Fatigue & Fracture of Engineering Materials & Structures (投稿中)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] き裂治癒による強加工された窒化ケイ素/炭化ケイ素複合材の強度回復

    • Author(s)
      鄭永順, 安藤柱, 他3名
    • Journal Title

      日本ばね学会論文集 (印刷中)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Strength recovery of mechined Al_2O_3/SiC composite ceramics by crack-healing

    • Author(s)
      M.Masato, K.Ando, 他2名
    • Journal Title

      Fatigue & Fracture of Engineering Material & Structures (印刷中)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Strength Recovery Behavior of Machined Al_2O_3/SiC Nano-composite Ceramics by Crack-healing

    • Author(s)
      K.ANDO, 他4名
    • Journal Title

      Journal of the European Ceramic Society (Submitted)(10月掲載予定)

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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