Phase Transformation of Zirconia Ceramics by Annealing in Hot Water. (Part 2).

Ohmichi, Nobukatsu; Kamioka, Kunikazu; Ueda, Kuniyoshi; Matsui, Koji; OHGAI, Michiharu

doi:10.2109/jcersj.107.820

Cited by 13 publications

(19 citation statements)

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“…Ohmichi et al 5 . reported results of the Rietveld analysis of 4Y‐TZP using two cubic phases and the tetragonal phase model.…”

Section: Resultsmentioning

confidence: 99%

“…Although the crystal structure of Y‐TZP is important, both for determining mechanical properties 3 and for hydrothermal degradation, few studies have addressed the crystal structure of the sintered body 4–7 . We studied the crystal structure of 3Y‐TZP previously, and discussed the relationship between the phase‐separated structure and hydrothermal degradation 8 .…”

Section: Introductionmentioning

confidence: 99%

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Synchrotron X‐Ray Study of the Crystal Structure and Hydrothermal Degradation of Yttria‐Stabilized Tetragonal Zirconia Polycrystal

Yamashita

Tsukuma

Tojo

et al. 2008

Journal of the American Ceramic Society

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Structural study with synchrotron X-ray diffractometry was made on phase separation phenomena in 2, 3, and 4 mol% Y 2 O 3 -stabilized tetragonal ZrO 2 polycrystal (abbreviated as 2, 3, and 4Y-TZP, respectively). The sintered body of 3Y and 4Y-TZP underwent phase separation into high and low yttrium regions as sintering temperature increased, and the tetragonal phase was assigned to both regions. The sintering body is less separated, and a large monoclinic phase was detected in 2Y-TZP. Analysis of aging kinetics of tetragonal-to monoclinicphase transition showed that the fraction of the transformable phase agreed with that of the low yttrium region.

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“…Ohmichi et al 5 . reported results of the Rietveld analysis of 4Y‐TZP using two cubic phases and the tetragonal phase model.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synchrotron X‐Ray Study of the Crystal Structure and Hydrothermal Degradation of Yttria‐Stabilized Tetragonal Zirconia Polycrystal

Yamashita

Tsukuma

Tojo

et al. 2008

Journal of the American Ceramic Society

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“…However, according to our previous studies on LTD in 3Y, the stability of the tetragonal phase is determined by not only the grain size but also the concentration of Y 3+ ions in the grain interiors16. 3Y bodies sintered at 1350°C for different sintering times that ranged from 0 to 10 h exhibited the same grain size of approximately 290 nm; however, the rate of the T → M phase transformation increased with increasing sintering time16. The Rietveld analysis revealed that, with increased sintering time, the Y 2 O 3 concentration in the tetragonal phase decreased and cubic phase fraction increased.…”

Section: Discussionmentioning

confidence: 98%

“…According to existing reports, direct penetration of H 2 O molecules is likely to be responsible for LTD in Y-TZP 7 8 9 10 11 , although the detailed mechanism of LTD is still uncertain. Previous studies have also indicated that a finer grain size or a higher Y 2 O 3 concentration in Y-TZP effectively suppresses the T → M phase transformation and retards LTD 12 13 14 15 16 17 18 . Given these aspects of the phase transformation of Y-TZP, control of its microstructure development during sintering is a key technique in improving its LTD resistance.…”

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confidence: 98%

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Nanocrystalline, Ultra-Degradation-Resistant Zirconia: Its Grain Boundary Nanostructure and Nanochemistry

Matsui

Yoshida

Ikuhara

2014

Sci Rep

Self Cite

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Y2O3-stabilized tetragonal ZrO2 polycrystal (Y-TZP) has been known to be an excellent structural material with high strength and toughness since the pioneering study by Garvie et al. in 1975. However, Y-TZP is not considered an environmental or biomedical material because it undergoes an inherent tetragonal-to-monoclinic (T→M) phase transformation in humid or aqueous environment, which leads to premature failure, so-called low-temperature degradation (LTD). In this study, we demonstrate for the first time that this fatal shortcoming of Y-TZP can be resolved by controlling the grain boundary nanostructure and chemical composition distribution in Y-TZP. Nanocrystalline Y-TZP doped with Al3+ and Ge4+ ions exhibits no LTD for more than 4 years in hot water at 140°C, whereas 70% of the tetragonal phase in conventional TZP transforms to the monoclinic phase within only 15 h. This innovative Y-TZP can be fabricated by pressureless sintering at 1200°C; far below the sintering temperature for conventional Y-TZP. The developed TZP ceramics will be useful in numerous environmental-proofing applications, particularly in the biomedical engineering field.

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Oxygen – Yttrium – Zirconium

Fabrichnaya

2010

Landolt-Börnstein - Group IV Physical Chemistry

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Phase Transformation of Zirconia Ceramics by Annealing in Hot Water. (Part 2).

Cited by 13 publications

References 0 publications

Synchrotron X‐Ray Study of the Crystal Structure and Hydrothermal Degradation of Yttria‐Stabilized Tetragonal Zirconia Polycrystal

Synchrotron X‐Ray Study of the Crystal Structure and Hydrothermal Degradation of Yttria‐Stabilized Tetragonal Zirconia Polycrystal

Nanocrystalline, Ultra-Degradation-Resistant Zirconia: Its Grain Boundary Nanostructure and Nanochemistry

Oxygen – Yttrium – Zirconium

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