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Challenge to strengthen ceramics beyond theoretical strength by introducing lattice defects

Research Project

Project/Area Number 21K04937
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 31010:Nuclear engineering-related
Research InstitutionTohoku University

Principal Investigator

Kondo Sosuke  東北大学, 金属材料研究所, 准教授 (10563984)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords照射損傷 / SiC / SiC繊維 / マイクロピラー / 非晶質化 / 共有結合 / 強度 / セラミックス / アンチサイト / 格子欠陥 / イオン照射
Outline of Research at the Start

本来,IV-IV族化合物であるSiC結晶の硬さは共有結合強度に由来し,その本質は核間領域の電子軌道の重なりの大きさである.これは重なりを大きくすれば理論的には硬くなると理解できる.共有結合性結晶は圧縮強度が結合距離の3.5乗に反比例するとされ,SiCでも約10%の収縮でダイヤモンドに匹敵する.このことは,もし結合距離を一様に収縮できれば理論強度を超えられる可能性を示唆する.これを照射による格子位置交換の蓄積で実現できるのではないかということが私の「問い」である.本研究ではこの答えを,SiCマイクロピラーにイオン照射によってアンチサイトを導入し,その強度変化を追うことで明らかにすることを目指す.

Outline of Final Research Achievements

Silicon carbide (SiC) fiber-reinforced SiC matrix composites (SiCf/SiC) are expected to be used as blanket materials in nuclear fusion reactors, but irradiation-induced shrinkage is a significant issue. This study aimed to investigate the effects of irradiation on SiC fibers and elucidate the mechanisms of shrinkage and expansion. Through SEM and STEM observations, complete amorphization of HNLS fibers and partial amorphization of TSA3 fibers were confirmed, and the degradation of mechanical properties was evaluated. Furthermore, the study clarified the impact of the degree of amorphization on mechanical properties and proposed optimal usage conditions, providing insights that contribute to the performance improvement of SiCf/SiC.

Academic Significance and Societal Importance of the Research Achievements

この研究は、核融合炉の安全性と効率性を向上させるために重要である。SiC繊維強化SiCマトリックス複合材料(SiCf/SiC)は、高温や放射線に耐えうる材料として核融合炉のブランケット材料に適しているが、放射線照射による収縮と機械的特性の劣化が課題であった。本研究はそのメカニズムを解明し、最適な使用条件を提案することで、核融合炉の実用化に向けた材料設計の基盤を提供する。これにより、持続可能なエネルギー源としての核融合技術の発展に寄与する。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Effects of grain boundary volume fraction on the threshold dose of irradiation-induced SiC amorphization at 30?°C2023

    • Author(s)
      Yuan Xinwei、Kondo Sosuke、Yabuuchi Kiyohiro、Yu Hao、Ogino Yasuyuki、Kasada Ryuta
    • Journal Title

      Journal of the European Ceramic Society

      Volume: 43 Issue: 12 Pages: 5125-5135

    • DOI

      10.1016/j.jeurceramsoc.2023.04.042

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Evaluation of equi‐biaxial strength of thin sic coatings using ring‐on‐ring testing and digital image correlation2023

    • Author(s)
      Iwamoto Sola、Kondo Sosuke、Katsui Hirokazu、Shimoda Kazuya、Yu Hao、Ogino Yasuyuki、Kasada Ryuta
    • Journal Title

      International Journal of Applied Ceramic Technology

      Volume: ー Issue: 4 Pages: 2738-2746

    • DOI

      10.1111/ijac.14553

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Effect of grain size on the amorphous threshold of SiC in low-temperature irradiation2023

    • Author(s)
      Xinwei Yuan, Sosuke Kondo, Kiyohiro Yabuuchi, Hao Yu, Yasuyuki Ogino, Ryuta Kasada
    • Organizer
      ICFRM-21
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Changes in microstructure of SiC fibers irradiated at room temperature2022

    • Author(s)
      Xinwei Yuan, Sosuke Kondo, Hao Yu, Kiyohiro Yabuuchi, Ryuta Kasada
    • Organizer
      第14回核融合エネルギー連合講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Amorphization of SiC fiber under ion irradiation at 30 ℃2022

    • Author(s)
      Xinwei Yuan, Sosuke Kondo, Hao Yu, Kiyohiro Yabuuchi, Ryuta Kasada
    • Organizer
      材料照射研究会2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Strength degradation and mechanism of SiC fiber after oxidation2022

    • Author(s)
      Xinwei Yuan, Sosuke Kondo, Hao Yu, Yasuki Okuno, Kazuya Shimoda, Ryuta Kasada
    • Organizer
      日本セラミックス協会 第35回秋季シンポジウム
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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