Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal doped with small amounts of alumina: Effect of grain-boundary energy

Matsui, Koji; Nakamura, Kazuto; Kumamoto, Akihito; Yoshida, Hidehiro; Ikuhara, Yuichi

doi:10.1016/j.jeurceramsoc.2015.09.016

Cited by 19 publications

(19 citation statements)

References 43 publications

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“…Since it caused difficulty in determining the extent for aging times shorter than 100 h, the 3Y-TZP was sintered at 1550 °C for 20 h to expedite the transformation and was used for the remaining experiments. The 3Y-TZP, employed in this investigation, is known to be less vulnerable to LTD because the Al 2 O 3 content of 0.25 wt.% decreases the grain boundary energy of t-ZrO 2 to suppress LTD as a result of the grain boundary segregation of Al 3+ ions [ 38 ]. Furthermore, this aging study was performed in ambient atmosphere to minimize the involvement of water species, which has been reported as the cause of LTD in numerous reports on this subject.…”

Section: Discussionmentioning

confidence: 99%

Influence of Preaging Temperature on the Indentation Strength of 3Y-TZP Aged in Ambient Atmosphere

et al. 2021

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Yttria-stabilized zirconia (3Y-TZP) containing 0.25% Al2O3, which is resistant to low temperature degradation (LTD), was aged for 10 h at 130–220 °C in air. The aged specimens were subsequently indented at loads ranging from 9.8 to 490 N using a Vickers indenter. The influence of preaging temperature on the biaxial strength of the specimens was investigated to elucidate the relationship between the extent of LTD and the strength of zirconia restorations that underwent LTD. The indented strength of the specimens increased as the preaging temperature was increased higher than 160 °C, which was accompanied by extensive t-ZrO2 (t) to m-ZrO2 (m) and c-ZrO2 (c) to r-ZrO2 (r) phase transformations. The influence of preaging temperature on the indented strength was rationalized by the residual stresses raised by the t→m transformation and the reversal of tensile residual stress on the aged specimen surface due to the indentation. The results suggested that the longevity of restorations would not be deteriorated if the aged restorations retain compressive residual stress on the surface, which corresponds to the extent of t→m phase transformation less than 52% in ambient environment.

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Section: Discussionmentioning

confidence: 99%

Influence of Preaging Temperature on the Indentation Strength of 3Y-TZP Aged in Ambient Atmosphere

et al. 2021

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“…Particularly, the addition of a small amount of Al 2 O 3 has significant influences on the densification rate and microstructure development during sintering in Y-TZP. 30,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] For instance, 0.1-1 mol% Al 2 O 3 addition significantly enhances the densification rate at low temperatures 30,[33][34][35][36][37][38][39]48 and is highly effective for enhancing resistance to low-temperature degradation (LTD) in Y-TZP. 42,[49][50][51][52] To understand the Al 2 O 3 -enhanced densification behavior, the initial sintering mechanism was investigated based on the results obtained by CRH and isothermal sintering analyses.…”

Section: Introductionmentioning

confidence: 99%

Initial sintering mechanism and additive effect in zirconia ceramics

Matsui

Hojo

2022

J Am Ceram Soc.

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Y2O3‐stabilized ZrO2 (YSZ) ceramics have been used for various engineering applications because of their excellent mechanical properties or oxide‐ion conductivity applicable to solid‐electrolyte. The performance of YSZ depends on the sintered texture that is directly determined by sinterability of raw powders. A new kinetic analysis method of diffusion mechanism based on an initial sintering theory (grain‐boundary or volume diffusion) is theoretically derived, the initial sintering mechanism of hydrolytic YSZ powder is experimentally determined, and the effects of powder characteristics on sinterability are discussed. Furthermore, the additive‐enhanced sintering is proposed. A small amount of Al2O3 significantly enhances the densification. Using the additive effect, the low‐temperature degradation that is the fault of zirconia ceramics can be improved by decreasing the sintering temperature.

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“…Fig.7(a) XRD profiles of 3Y sintered at 1500°C treated for various aging times in water at 140°C32) . (b) Backscattered SEM image of cross section in 3Y (sintered at 1500°C) after the LTD test conducted for 60 h37) .…”

mentioning

confidence: 99%

ファインセラミックス用ジルコニア粉末の製造方法

Matsui

2021

J. Jpn. Soc. Powder Powder Metallurgy

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Y 2 O 3 -stabilized ZrO 2 (YSZ) ceramics have been used for various engineering applications or as a solid electrolyte in oxygen sensors and fuel cells. The performance in YSZ strongly depends on the microstructure which is directly determined by the characteristic of raw powder. In this paper, the synthetic methods of YSZ powder and its starting material are first overviewed, and then the formation mechanism of YSZ powder is explained, focusing the hydrolysis process which is industrially adopted. Next, microstructural development during sintering of the hydrolytic YSZ powder is summarized, focusing Y 2 O 3 -stabilized tetragonal ZrO 2 polycrystal (Y-TZP) with excellent mechanical properties among YSZ. The author finally introduces that based on the hydrolytic process technique and microstructural knowledge, low temperature degradation that is fatal shortcoming of Y-TZP can be resolved by controlling the grain-boundary nanostructure and chemical composition distribution in Y-TZP.

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Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal doped with small amounts of alumina: Effect of grain-boundary energy

Cited by 19 publications

References 43 publications

Influence of Preaging Temperature on the Indentation Strength of 3Y-TZP Aged in Ambient Atmosphere

Influence of Preaging Temperature on the Indentation Strength of 3Y-TZP Aged in Ambient Atmosphere

Initial sintering mechanism and additive effect in zirconia ceramics

ファインセラミックス用ジルコニア粉末の製造方法

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