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Challenge for ultra-high toughning of functional oxide

Research Project

Project/Area Number 16K14052
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Energy-related chemistry
Research InstitutionTohoku University

Principal Investigator

SATO Kazuhisa  東北大学, 工学研究科, 准教授 (50422077)

Research Collaborator KUMADA Keigo  
YOSHIDA Naoki  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsセラミックス / 酸素不定比性 / 酸化 / 還元 / 強度 / 靭性 / 欠陥 / 電子 / 高靭性化 / 電気化学的特性 / 分子動力学 / 機能性酸化物 / 破壊じん性 / 高温 / ナノポーラス構造 / 破壊じん性の向上 / 機械材料・材料力学 / 複合材料・物性 / 環境材料
Outline of Final Research Achievements

In this study, we searched for a method to give tenacity with a new concept for fragile ceramic materials. Specifically, the temperature and environment were systematically changed for ceria-based oxides, and changes in mechanical properties, oxygen defects, and ion-electron conduction were investigated. It has been found that the elastic modulus, which is an important factor of mechanical properties, decreases about 20% in the reducing environment as compared to the oxidizing environment. On the other hand, it was revealed that the fracture strength was improved by about 20% contrary to the elastic modulus. This fact is considered to be due to the fact that the electron conduction increases as the amount of oxygen defects increases under a reducing environment. Thus, a material that can contribute to the improvement of toughness can be developed by searching for an oxygen non-stoichiometric oxide.

Academic Significance and Societal Importance of the Research Achievements

セラミックスというと脆くて弱いイメージがあり、構造材料にはほとんど用いられない。一方、耐熱性や耐薬品性などに優れているため、セラミックス単独で構造材を構築できれば応用範囲は格段に広がる。本研究は全く新たなコンセプトでセラミックスの強度を向上することに成功した。原子同士の結合力を弱め、欠陥近傍の滑りを起こすことで金属的な機能を付与することができたものと思われる。今後、き裂先端近傍の観察をより詳細に行うことで現在の金属材料を凌駕する新材料が開発できることが期待できる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (11 results)

All 2018 2017 2016

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results,  Acknowledgement Compliant: 2 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Anisotropy of Fracture Toughness of Stabilized Zirconia Investigated by Nano-Identation Method2018

    • Author(s)
      Hideaki Ito, Kazuhisa Sato, Atsushi Unemoto, Shin-ichi Hashimoto, Koji Amezawa, Tatsuya Kawada
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 59 Issue: 1 Pages: 23-26

    • DOI

      10.2320/matertrans.MB201705

    • NAID

      130006279160

    • ISSN
      1345-9678, 1347-5320
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electrochemical Degradation Caused by Mechanical Damage in Silicon Negative Electrodes2017

    • Author(s)
      Naoki Yoshida, Tadashi Sakamoto, Naoaki Kuwata, Junichi Kawamura, Kazuhisa Sato, Toshiyuki Hashida
    • Journal Title

      ECS Transactions

      Volume: 75 Issue: 20 Pages: 31-37

    • DOI

      10.1149/07520.0031ecst

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Preparation and Electrochemical Evaluation of LiCoO2 Film Prepared with Cold Spraying for Development of Lithium-Ion Battery2017

    • Author(s)
      Kohei Okuyama, Naoki Yoshida, Kazuhisa Sato, Toshiyuki Hashida
    • Journal Title

      ECS Transactions

      Volume: 75 Issue: 20 Pages: 191-199

    • DOI

      10.1149/07520.0191ecst

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Evaluation of Mechanical Damages in SOFCs during Start/Stop Operation by Using Acoustic Emission Technique2017

    • Author(s)
      Kumada Keigo、Sato Kazuhisa、Hashida Toshiyuki
    • Journal Title

      ECS Transactions

      Volume: 78 Issue: 1 Pages: 2355-2363

    • DOI

      10.1149/07801.2355ecst

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Investigation of mechanical damage of SOFC caused by electrochemical oxidation using in-situ acoustic emission and electrochemical technique2018

    • Author(s)
      K. Kumada, K. Sato, T. hashida
    • Organizer
      First International Conference on 4D Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 中温作動型固体酸化物燃料電池用Ni-Feアノード材料の材料強度学的特性評価に関する研究2017

    • Author(s)
      村岡 諒, 渡辺 智, 石原 達己, 佐藤 一永, 橋田 俊之
    • Organizer
      日本機械学会 東北支部 第52期総会・講演会
    • Place of Presentation
      東北大学
    • Year and Date
      2017-03-14
    • Related Report
      2016 Research-status Report
  • [Presentation] 固体酸化物燃料電池用 Ni-Fe 燃料極材料の酸化雰囲気下における耐久性評価に関する研究2017

    • Author(s)
      行則 啓太,村岡 諒,鈴木 研,佐藤 一永,橋田 俊之
    • Organizer
      東北学生会 第 47 回学生員卒業研究発表講演会
    • Place of Presentation
      東北学院大学
    • Year and Date
      2017-03-08
    • Related Report
      2016 Research-status Report
  • [Presentation] 酸化還元サイクル環境中における固体酸化物燃料電池の機械的劣化評価に関する研究2017

    • Author(s)
      熊田圭悟,佐藤一永, 橋田俊之
    • Organizer
      2017 年度日本機械学会年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] レドックスサイクル環境下における固体酸化物燃料電池の劣化評価に関する研究2017

    • Author(s)
      熊田圭悟,佐藤一永,橋田俊之
    • Organizer
      日本機械学会 東北支部 第 53 期秋季講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] テラヘルツ分光と機械学習を併用した固体酸化物燃料電池の損傷可視化2017

    • Author(s)
      薮田佳絵,熊田圭悟,碇智文,福井健一,沼尾正行,佐藤 一永,橋田俊之
    • Organizer
      応用物理学会フォトニクス分科会 第2回フォトニクス研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] 中温作動型固体酸化物燃料電池用Ni-Feアノード材料の機械的特性評価に関する研究2016

    • Author(s)
      村岡 諒, 佐藤一永, 石原達己, 橋田俊之
    • Organizer
      日本機械学会 2016年度年次大会
    • Place of Presentation
      九州大学
    • Year and Date
      2016-09-11
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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