A Study on the Ceria Stabilized Tetragonal Zirconia Polycrystals (Ce-TZP) (IV) ; Effect of MgO Addition on 12 Ce-TZP Ceramics

CeO2 안정화 정방정 Zirconia 다결정체(Ce-TZP)에 관한 연구(IV) : 12 Ce-TZP 세라믹스에 미치는 MgO 첨가 영향

  • Published : 1990.02.01

Abstract

For theinvestigation of MgO addition effect on 12Ce-TZP ceramics, MgO-CeO2-ZrO2 ceramics was fabricated using commercial powders under sintering condition of 130$0^{\circ}C$-1$600^{\circ}C$ for 2hr. Fully tetragonal phase could be obtained by proper heat treatment and MgO addition amount. Minor cubic phase was appeared in relatively high MgO content composition at each sintering temperature. As alloying amount of MgO increased, tetragonal stability increased and grain size decreased. Grain size dependence on MgO content was verified by SEM observation of fractured surface. Surface bloating was observed from the 2 m/o to 6m/o in the temperature range of 150$0^{\circ}C$ to 1$600^{\circ}C$. In spite of very porous microstructure owing to surface bloating, 100% TZP could be maintained in 2.0m/o MgO composition by heat treatment of 150$0^{\circ}C$. This result indicated that MgO was more powerful stabilizer than CeO2. Mechanical proprties of MgO-CeO2-ZrO2 ceramics were consistent with the stability observation of tetragonal phase very well.

Keywords

References

  1. Acta. Metall. v.20 On a Martensitic Phase Transformation in Zirconia(ZrO₂)-Ⅰ. Metallographic EvidenceⅠ G.K. Bansal;A.H. Heuer
  2. Acta Metall. v.22 On a Martensitic Phase Transformation in Zirconia(ZrO₂)-Ⅱ. Crystallographic Evidence G.K. Bansal;A.H. Heuer
  3. Advances in Ceramics v.3 Transformation Toughening in Ceramics A.G. Evans;D.B. Marshall;N.H. Burlingame;A.H. Heuer(ed.);L.W. Hobbs(ed.)
  4. J. Am. Ceram. Soc. v.69 no.3 Strength Characteristic of Transformation-Toughened Zirconia D.B. Marshall
  5. Acta Metall. v.34 no.5 Overview No.48:Toughening of Brittle Solids by Martensitic Transformations A.G. Evans;R.M. Cannon
  6. J. Am. Ceram. Soc. v.66 no.7 Revised Phase Diagram of the System ZrO₂-CeO₂ Below 1400℃ E. Tani;M. Yoshimura;S. Somiya
  7. J. Mater. Sci. v.20 Strength, Fracture Toughness and the Vickers Hardness of CeO₂-Stabilized Tetragonal ZrO₂Polycrystals(Ce-TZP) K. Tsukuma;M. Shimada
  8. Am. Ceram. Soc. Bull. v.65 no.10 Mechanical Properties and Thermal Stability of CeO₂ Containg Tetragonal Zirconia Polycrystals K. Tsukuma
  9. 한국요업학회지 v.26 no.5 CeO₂안정화 정방정 Zirconia 다결정체 (Ce-TZP)에 관한 연구(Ⅰ):CeO₂함량에 따른 Ce-TZP의 기계적 성질과 파괴거동의 변화 김문일;박정현;강대석;문성환
  10. J. Mater. Sci. v.17 Transformation Toughening, PartⅠ. Size Effects Associated with the Thermodynamics of Constrained Transformations F.F. Lange
  11. J. Am. Ceram. Soc. v.71 no.9 Method of Fabricationg Ceria-Stabilized Tetragonal Zirconia Polycrystals S.B. Bhaduri;A. Chakraborty;R. Mohan Rao.
  12. J. Am. Ceram. Soc. Influence of MgO Additions on the Microstructure and Mechanical Properties of Al₂O₃-ZrO₂ Composites T. Kosmac;J.S. Wallace;N. Claussen
  13. Trans. J. Br. Ceram. Soc. v.82 Sintering Additives for Zirconia Ceramics Suxing Wu;R.J. Brook
  14. Advances in Ceramics v.24A Improvement to the Thermal Stability of Yttria-Doped Tetragonal Zirconia Polycrystals by Alloying with Various Oxides T. Sato;S. Ohtaki;T. Endo;M. Shimada;S. Somiya(ed.);N. Yamamoto(ed.);H. Hanagida(ed.)
  15. Fracture Mechanics Applied to Brittle Materials Use of Indentation Fracture to Determine Fracture Toughness R.H. Marion
  16. J. Am. Ceram. Soc. v.67 no.6 Phase Analysis in Zirconia System R.C. Garvie;P.S. Nicholson
  17. ibid v.67 no.6 Calibration Curve for Quantitative Analysis of the Monoclinic-Tetragonal ZrO₂ System by X-ray Diffraction H. Toraya;M. Yoshimura;S. Somiya
  18. J. Am. Ceram. Soc. v.64 no.4 X-Ray Determination of Transformation Depth in Ceramics Containing ZrO₂ T. Kosmac;R. Wagner;N. Claussen
  19. ibid v.71 no.7 X-Ray Determination of Transformation Zone Size in Toughened Ceramics Y. Mori;Y. Kitano;A. Ishitani
  20. IMC3 v.3 Phase Retension and Fracture Toughness of Materials Containing ZrO₂ F.F. Lange
  21. J. Phys. Chem. v.69 The Occurrence of Metastable Tetragonal Zirconia as a Crystallite Size Effect R.C. Garvie
  22. J. Mater. Sci. v.23 Synthesis and Sintering Behaviour in CeO₂-ZrO₂ Ceramics G.D. Jenq;T.D. Hsing;Y.H. Wei
  23. J. Am. Ceram. Soc. v.65 no.5 Mechanics of Transformation Toughening in Brittle Materials R.M. McMeeking;A.G. Evans
  24. Advances in Ceramics v.24B Strength and Fracture Toughness of Y-TZP, Ce-TZP, Y-TZP/Al₂O₃, and Ce-TZP/Al₂O₃ K. Tsukuma;T. Takahata;M. Shiomi;S. Somiya(ed.);N. Yamamoto(ed.);H. Yanagida(ed.)
  25. J. Am. Ceram. Soc. v.69 no.7 Strength Limitation of Transformation-Toughened Zirconia Alloys M.V. Swain;L.R.F. Rose