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Design of localized quantum structures in high temperature ceramics

Research Project

Project/Area Number 13305052
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionThe University of Tokyo

Principal Investigator

SAKUMA Taketo  The University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院・新領域創成科学研究科, 教授 (50005500)

Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥50,050,000 (Direct Cost: ¥38,500,000、Indirect Cost: ¥11,550,000)
Fiscal Year 2003: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2002: ¥26,520,000 (Direct Cost: ¥20,400,000、Indirect Cost: ¥6,120,000)
Fiscal Year 2001: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
KeywordsCeramics / GB Quantum structure / Superplasticity / Dopant / First principle calculation / High temperature deformation / Zirconia / Alumina / セラミック
Research Abstract

This study aims to design localized quantum structures suitable for improving mechanical properties of structural ceramics for high-temperature use. For this purpose, we investigated the effects of a small amount of dopants on mechanical properties in structural ceramics. Samples were prepared by ordinary sintering methods. As for doping, we tried to dope several kinds of ions at a level of a few one-tenth mol % using solutions including ions. In order to reveal such effects due to doping, we combined microstructual analysis at an atomic scale and mechanical properties testing. As for microstructual analysis, high resolution electron transmission microscopy (HRTEM), energy dispersive spectroscopy(EDS) and electron energy loss spectroscopy(EELS) were carried out. It was found that the dopant effect is very sensitive to mechanical properties. In particular, by doping different ions simultaneaouly, elongation at high-temperature was largely increased up to 1000% in ZrO2-based superplastic material. Such co-doping effect was confirmed to occur even at a level of 0.1mol%. This result is the first one in the field of superplastic materials. The co-doping effects could be confirmed to be due to a change of electronic structure localized at grain boundaries, which is caused by a small amount of dopants.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] T.Saito, T.Furuta J.-H.Hwang, S.Kuramoto, K.Nishino, N.Suzuki, R.Chen, A.Yamada, K.Ito, Y.Seno, T.Nonaka, H.Ikehata, N.Nagasakom, C.Iwamoto, Y.Ikuhara, T.Sakuma: "Multifunctional alloys obtained via a dislocation-free plastic deformation mechanism"Science. 18. 464-467 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Sakuma: "Grain boundary plasticity and failure in oxide ceramics at high temperature"Adv.Quantum Chemistry. 42. 23-33 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Watanabe, H.Yoshida, T.Sakuma: "The Densification Behavior and Grain Boundary Diffusivity in Cation-Doped Alumina"Key Eng.Mater.. 247. 67-70 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Yoshida, Y.Ikuhara, T.Sakuma: "Grain Boundary Electronic Structure and High Temperature Plastic Flow in Polycrystalline Al_2O_3"Key Eng.Mter.. 247. 263-266 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Watanabe, H.Yoshida, Y.Ikuhara, T.Sakuma, H.Muto, M.Sakai: "Grain boundary sliding and atomic structures in alumina bicrystals with [0001] symmetric tilt grain boundaries"MATERIALS TRANSACTIONS. 43. 1561-1565 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Z.L.Hong, H.Yoshida, Y.Ikuhara, T.Sakuma, T.Nishimura, M.Mitomo: "The effect of additive on the densification process and high temperature strength retention in silicon nitride with Re-disilicate"J.Europ.Ceram.Soc.. 22. 527-534 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Saito, T.Furuta, J.-H.Hwang, S.Kuramoto, K.Nishino, N.Suzuki, R.Chen, A.Yamada, K.Ito, Y.Seno, T.Nonaka, H.Ikehata, N.Nagasakom C.Iwamoto, Y.Ikuhara, T.Sakuma: "Multifunctional alloys obtained via a dislocation-free plastic deformation mechanism"Science. 18. 464-467 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Sakuma: "Grain boundary plasticity and failure in oxide ceramics at high temperature"Adv.Quantum Chemistry. 42. 23-33 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Watanabe, H.Yoshida, T.Sakuma: "The Densification Behavior and Grain Boundary Diffusivity in Cation-Doped Alumina"Key Eng.Mater.. 247. 67-70 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Yoshida, Y.Ikuhara, T.Sakuma: "Grain Boundary Electronic Structure and High Temperature Plastic Flow in Polycrystalline Al_2O_3"Key Eng.Mter.. 247. 263-266 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Watanabe, H.Yoshida, Y.Ikuhara, T.Sakuma, H.Muto, M.Sakai: "Grain boundary sliding and atomic structures in alumina bicrystals with [0001] symmetric tilt grain boundaries"MATERIALS TRANSACTIONS. 43. 1561-1565 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Z.L.Hong, H.Yoshida, Y.Ikuhara, T.Sakuma, T.Nishimura, M.Mitomo: "The effect of additive on the densification process and high temperature strength retention in silicon nitride with Re-disilicate"J.Europ.Ceram.Soc.. 22. 527-534 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Saito, T.Furuta, J.-H.Hwang, S.Kuramoto, K.Nishino, N.Suzuki, R.Chen, A.Yamada, K.Ito, Y.Seno, T.Nonaka, H.Ikehata, N.Nagasako, C.Iwamoto Y.Ikuhara, T.Sakuma: "Multifunctional alloys obtained via a dislocation-free plastic deformation mechanism"Science. 18. 464-467 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Sakuma: "Grain boundary plasticity and failure in oxide ceramics at high temperature"Adv.Quantum Chemistry. 42. 23-33 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Nakatani, H.Nagayama, H.Yoshida, T.Yamamoto, T.Sakuma: "The Effect of Grain Boundary Segregation on Superplastic Behavior in Cation-Doped 3Y-TZP"Scripta Mater.. 49. 791-795 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Watanabe, H.Yoshida, T.Sakuma: "The Densification Behavior and Grain Boundary Diffusivity in Cation-Doped Alumina"Key Eng.Mater.. 247. 67-70 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Yoshida, Y.Ikuhara, T.Sakuma: "Grain Boundary Electronic Structure and High Temperature Plastic Flow in Polycrystalline Al_2O_3"Key Eng.Mater.. 247. 263-266 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Yoshida, H.Nagayama, T.Sakuma: "Small Dopant Effect on Static Grain Growth and Flow Stress in Superplastic TZP"Mater.Trans.. 44. 935-939 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] A.Kuwabara, J.Katamura, Y.Ikuhara, T.Sakuma: "Influence of interaction between neighboring oxygen ions on phase stability in cubic zirconia"J. Am. Ceram. Soc.. 85. 2557-2561 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Yoshida, Y.Ikuhara, T.Sakuma: "Grain boundary electronicstructure related to the high-temperature creep resistance in polycrystalline Al_2O_3"Acta Mater.. 50. 2955-2966 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Sato, F.Oba, T.Yamamoto, Y.Ikuhara, T.Sakuma: "Current-voltage characteristics across [0001] twist boundaries in zinc oxide bicrystals"J. Am. Ceram. Soc.. 85. 2142-2144 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yamamoto, F.Oba, Y.Ikuhara, T.Sakuma: "Current-voltage characterisitics across small angle symmetric tilt boundaries in Nb-doped SrTiO_3 bicrystals"Mater. Trans.. 43. 1537-1541 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Nakagawa, G.Pezzotti, K.Ota, Y.Ikuhara, H.Yoshida, T.Sakuma: "Internal friction behavior of alumina polycrystals with engineered grain boundaries"Mater. Trans.. 43. 1557-1560 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Watanabe, H.Yoshida, Y.Ikuhara, T.Sakuma, T.Muto, M.Sakai: "Grain boundary sliding and atomic structures in alumina bicrystals with [0001] symmetric tilt grain boundaries"Mater. Trans.. 43. 1561-1565 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Z.L.Hong, H.Yoshida, Y.Ikuhara, T.S.akuma, T.Nishimura, M.Mitomo: "A new approach to analyze the stress relaxation in Si_3N_4-Re_2Si_2O_7(Re : Nd, Sm, Y, Yb)"Key Eng. Mater..

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Ikuhara, H.Yoshida, T.Sakuma: "Impurity effect on grain boundary strength in structural ceramics"Key Eng. Mater.. A319-321. 24-30 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 桑原彰秀, 幾原雄一, 佐久間健人: "第一原理分子軌道法による安定化ジルコニアの相安定性評価"材料. 50. 619-624 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Sasaki, M.Nakano, J.Mimurada, Y.Ikuhara, T.Sakuma: "Superplastic characteristics in germania based codoped Y-TZP"Mater. Sci. Forum. 357-359. 129-134 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nakano, J.Mimurada, K.Sasaki, Y.Ikuhara, T.Sakuma: "Superplastic flow stress in cation-doped YSZ"Mater. Sci. Forum. 357-359. 141-146 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 吉田英弘, 幾原雄一, 佐久間健人: "耐高温クリープ性アルミナセラミックスの粒界構造と電子状態"「電子顕微鏡法の実践と応用写真集」日本鉄鋼協会・日本金属学会. (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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