Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Preparation and Characteristics of $Y_2O_3-CeO_2-ZrO_2$ Structural Ceramics : II. Mechanical Properties and Thermal Stability of Sintered Body

$Y_2O_3-CeO_2-ZrO_2$ 구조세라믹스의 제조 및 특성 : II. 소결체의 기계적 성질 및 열적 안정성

  • 오혁상 (부산대학교 무기재료공학과) ;
  • 이윤복 (부산대학교 무기재료공학과) ;
  • 김영우 (포항산업과학연구원) ;
  • 오기동 (부산대학교 무기재료공학과) ;
  • 박홍채 (부산대학교 무기재료공학과)
  • Published : 1997.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

ZrO2 powders stabilized with Y2O3 and CeO2 of various compositions were prepared by the coprecipitation of water-soluble ZrOCl2.8H2O, YCl3.6H2O and Ce(NO3)3.6H2O, and their compacts were pressurelessly sintered at 1400 and 150$0^{\circ}C$ for 2hrs in air. 2mol% Y2O3-ZrO3 showed the most superior strength (1003MPa) and microhardness (12.6GPa), while 10 mol%CeO2-ZrO2 had the hightest toughness (13.3 MPa.m1/2) after sintering at 140$0^{\circ}C$. The addition of Y2O3 into Y2O3-ZrO3 decreased mean grain size and increased strength and hardness but decrease toughness. On the other hand, the addition of CeO2 into Y2O3-ZrO2 enhanced the stability of tetragonal phase during low-temperature aging for a long time under hydrothermal atmosphere.

수용성 ZrOCl2.8H2O, YCl3.6H2O 및 Ce(NO3)3.6H2O를 사용하여 공침법으로 다양한 조성의 Y2O3-CeO2-ZrO2 분말을 합성하고, 이들의 압분체를 1400, 150$0^{\circ}C$에서 2시간동안 공기 중에서 상압소결하였다. 2mol%Y2O3-ZrO2 조성의 140$0^{\circ}C$ 소결체는 강도(1003MPa)와 미세경도(12.6GPa) 면에서 제일 우수하였으나, 인성은 10mol%CeO2-ZrO2의 경우가 13.3MPa.m1/2로 제일 높았다. CeO2-ZrO2에Y2O3의 첨가는 소결체의 평균 결정입자의 크기를 감소시켰고, 이로 인하여 강도와 경도는 증가하지만 인성은 감소하였다. 반면에 Y2O3-ZrO3에 CeO2의 첨가는 수열분위기에서 장시간 저온시효동안 정방정상의 안정화를 향상시키는 효과를 나타내었다.

Keywords

References

  1. Advances in Ceramics;Science and Technology of Zirconia v.3 Zirconia-an Overview E.O. Subbaro;A.H. Heuer(ed.);L.W. Hobbs(ed.)
  2. Advances in Ceramics;Science and Technology of Zirconia Ⅲ v.24 Improvement to the Thermal Stability of Yittria-Doped Tetragonal Zirconia Polycrystals by Alloying with Various Oxides T. Sato;S. Ohtaki;T. Endo;M. Shimada;S. Sumiya(ed.);N. Yamamoto(ed.);H. Hanagida(ed.)
  3. J. Euro. Ceram. Soc. v.10 Zirconia Stabilized with Mixture of thd Rare Earth Oxides W. Pada;D. Haberko
  4. J. Euro. Ceram. Soc. v.9 Effect of Dopants on the Sintering Behaviour and Stability of Tetragonal Zirconia Ceramics G.S.A.M. Theunissen;A.J.A. Winnubst;A.J. Burggraaf
  5. Transformation Toughening of Ceramics D. J. Green;R. H. J. Hannink;M. V. Swain
  6. Advances in Ceramics;Science and Technology of Zirconia Ⅱ v.12 Thermal and Mechanical Properties of Y203-Stabilized Tetragonal Zirconia Polycrystals K. Tsukuma;Y. Kubota;T. Tsukidate;N. Claussen(ed.);M.R. hle(ed.)
  7. Am. Ceram. Soc. Bull. v.65 no.10 Mechanical Properties and Thermal Stability of CeO2 Containing Tetragonal Zirconia Polycrystals K. Tsukuma
  8. J. Am. Ceram. Soc. v.71 no.10 Sintering Microstructure, Hardness, and Fracture Toughness Behaviour of Y₂O₃-CeO₂-ZrO₂ J.G. Duh;H.T. Dai
  9. J. Mater. Sci. v.24 Fabrication and Sinterability in Y203-CeO2-ZrO2 J.G. Duh;M.Y. Lee
  10. J. Kor. Ceram. Soc. v.33 no.9 Preparation and Characteristics of Y₂O₃-CeO₂-ZrO₂Structural Ceramics: Ⅰ. Synthesis and Sinterability of Powder H. S. Oh;Y. B. Lee;Y. W. Kim;K. D. Oh;H. C. Park
  11. J. Am. Ceram. Soc. v.67 no.7 Sintering of ZrO2 in HCI Atmospheres M. J. Ready;D. W. Ready
  12. J. Am. Ceram. Soc. v.71 no.3 Quantative Analysis of Monoclinic-Stabilized Cubic ZrO₂Systems by X-Ray Diffraction H. Toraya;M. Yoshimura;S. Somiya
  13. J. Mat. Sci. v.10 Equilibrium Penny-like Cracks in Indentation Fracture B. R. Lawn;E. R. Fuller
  14. J. Am. Ceram. Soc. v.66 no.7 Revised Phase Diagram of the System ZrO2-CeO2 Below 1400℃ E. Tani;M. Yoshimura;S. Somiya
  15. J. Eur. Ceram. Soc. v.13 Yittria-Ceria Stabilized Tetragonal Zirconia Polycrystals Sintering, Grain Growth and Grain Boundary Segregation M. M. R. Boutz;A. J. A. Winnubst;A. J. Burggraaf
  16. J. Mater. Sci. v.26 Effects of TiO2 Addition on the Sintering of ZrO2.TiO2 Compositions and on the Retention of the Tetragonal Phases of Zirconia at Room Temperature V. C. Pandolfflli;A. J. Rodrigues;R. Stecers
  17. J. Mater. Sci. v.20 Strength, Fracture Toughness and Vickers Hardness of CeO2-Stabilized Tetragonal ZrO2 Polycrystals(Ce-TZP) K. Tsukuma;M. Shimada
  18. Ceramic Microstructures; Property Control by Processing W. E. Lee;W. M. Rainforth
  19. J. Mater. Sci. v.27 Fabrication and Microstructure-Mechanical Relationships in Ce-TZPs J. Wang;X. H. Zheng;R. Stevens