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Relationship between Grain Boundary Segregation Phenomena and Phase Transformation in Zirconia Ceramics

Research Project

Project/Area Number 06650809
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Material processing/treatments
Research InstitutionHimeji Institute of Technology

Principal Investigator

TSUBAKINO Harushige  Himeji Institute of Technology, Professor, 工学部, 教授 (00109894)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsGrain boundary phase / Amorphous phase / Alumina addition / Partially stabilized zirconia / Martensite transformation / Mechanical property / シリカ / 粒界非晶質相, / 粒界相組成, / マルテンサイト変態, / 変態速度,
Research Abstract

The mixed powders of ZrO_2-3mol% Y_2O_3 (partially stabilized zirconia) and Al_2O_3 are pressed and sintered at various temperatures ranging 1673 to 1973 K.Sintered bodies are investigated mainly by X-ray diffraction technique, TEM observations and estimation of mechanical properties. The resultso btained are as follows :
(1) Bending strength and fracture toughness increase with the addition of alumina.
(2) The tetragonal to monoclinic phase transformation takes place isothermally. With the addition of alumina, overall trans-formation rate decreases ; i.e., the nucleation rate of martensite lath decreases drastically but the growth stage is not affected, irrespective of alumina addition.
(3) In grain boundaries of PSZ containing alumina, amorphous phase enriched with alumina, silica, zirconia is formed. Its thickness increases with sintering temperature.
(4) The suppression of phase transformation and improvement of mechanical properties are attributed tothe formation of grain boundary amorphous phase. Silica plays an important role for theformation of grain boundary phase.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] H.Tsubakino et al: "Effect of Sintering Time on the Mechanical Properties in Y‐PSZ‐Al_2O_3 Ceramics" Proc.2nd Pacific Rim Inter.Conf. on Advanced Materials and Processing. 3. 2717-2723 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tsubakino et al: "Improvement of Mechanical Properties by the Formation of a Grain Boundary Phase in ZrO_2‐3mol% Y_2O_3‐Al_2O_3 Ceramics" Materials Processing and Design:Grain‐Boundary‐Controlled Properties of Fine Ceramics II,Ceramics,Ceramic Transactions,The American Ceramic Society. 44. 265-274 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tsubakino et al: "Isothermal Transformation Behaviours of Martensite in Zirconia‐3mol% Y ttria Containing Alumina" Solid→Solid Phase Transformations,ed. by W.C. Johnson et al,TMS. 749-754 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tsubakino et al: "Improvement of Mechanical Properties by the Firmation of a Grain Boundary Phase in ZrO_2-3mol% Y_2O_3-Al_2O_3 Ceramics" Ceramics Trans. 60. 265-274 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tsubakino et al: "Isothermal Transformation Behaviors of Martensite in Zirconia-3mol% Yttria Containing Alumina" Solid-Solid Phase Transformations, TMS-AIME. 749-754 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tsubakino et al: "Effect of Sintering Time on the Mechanical Properties in Y-PSZ-Al_2O_3 Ceramics" Proc.2nd Pacific Rim Inter.Conf.on Advanced Mater.and Processing. 3. 2717-2723 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tsubakino,et al.: "Effect of Sintering Time on the Mechanical Properties in Y-PSZ-Al_2O_3 Ceramics" Proc.2nd Pacific Rim Inter.Conf.on Advanced Materials and Processing. 3. 2717-2723 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Tsubakino: "Improvement of Mechanical Properties by the Formation of a Grain Boundary Phase in ZrO2-3mol%Y203-A1203 Ceramics" Ceramics Transactions. 60. 265-274 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Tsubakino: "Isothermal Transformation Behaviours of Martensite in Zirconia-3mol% Yttria Containing Alumina" Proc.Solid→Solid Phase Transformations. 749-754 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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