| 3가 양이온 산화물이 첨가된 2Y-TZP의 저온 상안정성 |
| 장주웅, 김학관, 이득용1, 김대준2, 박선민3 |
(주)우리동명 치과재료연구소
1대림대학 재료정보공학과
2KIST 복합기능세라믹센터
3요업기술원 도자기연구센터 |
| The Effect of Trivalent Cation Doping on the Low Temperature Phase Stability of 2Y-TZP |
| Ju-Woong Jang, Hak-Kwan Kim, Deuk-Yong Lee1, Dae-Joon Kim2, Sun-Min Park3 |
Woori Dong Myung Dental Research Center
1Department of Materials Engineering, Daelim College of Technology
2Multifunctional Ceramics Research Center, KIST
3Pottery Research Center, KICET |
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| ABSTRACT |
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The phase stability and the Low Temperature Degradation(LTD) mechanism of Tetragonal Zirconia Polycrystals(TZP), sintered specimens of $Y_2O_3$-Stabilized Zirconia(2Y-TZP), doped with trivalent cations, were evaluated by investigating meachnical properties, Raman spectra, lattice parameter variation and the oxygen vacancy behavior under applied electric field. XRD observation was put forward on 2Y-TZP doped with trivalent cation whose ionic radii were larger than $Zr^{4+}(Sc^{3+},;Yb^{3+},;Y^{3+},;Sm^{3+},;Nd^{3+},;La^{3+})$ up to 2 mol% and sintered at 1500 h for 1h. For $La^{3+}$ doping, the stability of tetragonal phase was degraded due to the formation of the pyrochlore phase $(La_2Zr_2O_7)$ as the dopant content increased above exceeded 0.5 mol%. As the dosage increased, tetragonal phase maintained for the case of $Sc^{3+}$, whose radius was similar to $Zr^{4+}$, on the other hand, the cubic phase was formed for the cases of $Yb^{3+},;Y^{3+},;Sm^{3+},;Nd^{3+}$. As the radii of dopant cation increased, c/a ratio increased and it was experimentally observed that the amount of monoclinic phase decreased when the specimens were annealed at $220{circ}C$ for 500 h. |
| Key words:
Tetragonal zirconia, Phase stability, Trivalent cation, c/a ratio, Raman spectra |
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