Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal: Effect of Y3+ distribution in grain interiors

Matsui, Koji; Nakamura, Kazuto; Saito, Mitsuhiro; Kuwabara, Akihide; Yoshida, Hidehiro; Ikuhara, Yuichi

doi:10.1016/j.actamat.2022.117659

Cited by 17 publications

(5 citation statements)

References 38 publications

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“…The SEM specimens were made by mirror polishing the sintered bodies with 0.03-μm colloidal silica and thermally etching for 2 min at a temperature 100 °C lower than the sintering temperature of each specimen in air. The average grain size was measured by the planimetric method ( 27 ). The microstructure of the surface after the LTD test was also observed by SEM, and the sample was made by cross-section polisher treatment (IB-09020CP, JEOL).…”

Section: Methodsmentioning

confidence: 99%

Ultrahigh toughness zirconia ceramics

Matsui

Hosoi

Feng

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The attainment of both high strength and toughness is the ultimate goal for most structural materials. Although ceramic material has been considered for use as a structural material due to its high strength and good chemical stability, it suffers from the limitation of low toughness. For instance, although Y 2 O 3 -stabilized tetragonal ZrO 2 polycrystals (Y-TZPs) exhibit remarkable toughness among ceramics due to their phase transformation toughening mechanism, this toughness is still much weaker than that of metals. Here, we report Y-TZP-based ceramic materials with toughnesses exceeding 20 MPa m 1/2 , which is comparable to those of metals, while maintaining strengths over 1,200 MPa. The superior mechanical properties are realized by reducing the phase stability of tetragonal zirconia by tailoring the microstructure and chemistry of the Y-TZP. The proposed ceramic materials can further advance the design and application of ceramic-based structural materials.

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Section: Methodsmentioning

confidence: 99%

Ultrahigh toughness zirconia ceramics

Matsui

Hosoi

Feng

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…The initial values of cell parameters, such as space group and atom coordinates, were taken from matching reference patterns from the crystallography open database (COD). The pseudo-Voigt function was chosen for peak shapes because it is a linear combination of Lorentzian and Gaussian functions and can be used to resolve strain and size contributions to peak broadening [24]. The goodness of fit (GOF) was evaluated in terms of profile R factors.…”

Section: Methodsmentioning

confidence: 99%

Defects in the grain interiors of 3 mol% yttria-stabilized tetragonal zirconia polycrystal ceramics with 0.25 wt% alumina

Xiong,

Luo,

Cheng

et al. 2024

Journal of Advanced Ceramics

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The presence of high-density defects is rarely observed in bulk 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics obtained through conventional pressureless sintering. In the present work, fine-grained dense 147 nm 3Y-TZP ceramics were prepared by pressureless sintering of commercial 0.25 wt% alumina-doped zirconia powders at 1300 ℃. A novel discovery was reported in which large amounts of defects were present in the grain interiors of the sample. The phenomenon was further examined using three types of powder samples, and the reasons for defect formation were investigated by microstructural characterization using high-resolution transmission electron microscopy (HRTEM) analysis and Rietveld refinement. The results confirmed the essential dependence of the defect formation on the alumina addition. The authors attributed the defect formation to the significant difference in ionic radii of the solvent and solute during the dissolution of alumina into the zirconia lattice. The sintering kinetics were proposed to be enhanced by the presence of substantial defects, which consequently favored the low-temperature sintering of the alumina-doped zirconia ceramics.

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“…The chemical composition of two of the powders was 35 mol%ZrO 2 ‐65 mol%SiO 2 and 50 mol%ZrO 2 ‐50 mol%SiO 2 , which were designated as 35Zr and 50Zr (Table 1), respectively. It is well known that yttrium is one of the most effective and classic dopants to stabilize tetragonal ZrO 2 when preparing ZrO 2 ‐based ceramics with solid‐state sintering 27 . To evaluate the effect of yttrium dopants on the microstructure of the rapidly‐quenched samples, a third powder with a composition of 2.9 mol%YCl 3 ‐34.0 mol%ZrO 2 ‐63.1 mol%SiO 2 was prepared.…”

Section: Methodsmentioning

confidence: 99%

“…It is well known that yttrium is one of the most effective and classic dopants to stabilize tetragonal ZrO 2 when preparing ZrO 2 -based ceramics with solid-state sintering. 27 To evaluate the effect of yttrium dopants on the microstructure of the rapidlyquenched samples, a third powder with a composition of 2.9 mol%YCl 3 -34.0 mol%ZrO 2 -63.1 mol%SiO 2 was prepared. This composition was designated as 2.9Y-34Zr (Table 1).…”

Section: Synthesis Of Raw Powder By Sol-gel Methodsmentioning

confidence: 99%

Microstructure of rapidly‐quenched ZrO₂‐SiO₂ glass‐ceramics fabricated by container‐less aerodynamic levitation technology

Wang

Sathyanath

et al. 2022

J Am Ceram Soc.

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In this work, an aerodynamic levitation technology (ALT) was utilized to prepare ZrO2‐SiO2 glass‐ceramics with two different ZrO2 contents, that is, 35 mol% and 50 mol%. The glass‐ceramics were partially melted at ∼2000°C or fully melted at ∼3000°C by ALT, followed by rapid quenching to obtain spherical glass‐ceramic beads. The phase compositions and microstructures of the glass‐ceramics were characterized. Crystallization of ZrO2 occurred during the solidification process and ZrO2 content, processing temperature, and the addition of yttrium (3 mol%) affected the crystalline phase of ZrO2. No ZrSiO4 or crystalline SiO2 were formed during the solidification process and the glass‐ceramics were away from thermodynamic equilibrium due to rapid quenching. The glass‐ceramics showed a microstructure of irregular‐shaped ZrO2 micro‐aggregates embedded in an amorphous SiO2 matrix, with lamellar twins and lattice defects formed within ZrO2 crystals. For samples prepared at ∼3000°C, a liquid‐liquid phase separation occurred in the melt, which eventually resulted in the formation of large and irregular‐shaped ZrO2 aggregates. In comparison, for samples prepared at ∼2000°C, pre‐existed ZrO2 crystals formed during heating acted as nucleation sites during the cooling process, followed by grain growth to form large ZrO2 aggregates. Solidification and microstructure formation mechanisms were proposed to elucidate the solidification process during rapid cooling and the microstructure of the glass‐ceramics obtained.

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Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal: Effect of Y3+ distribution in grain interiors

Cited by 17 publications

References 38 publications

Ultrahigh toughness zirconia ceramics

Ultrahigh toughness zirconia ceramics

Defects in the grain interiors of 3 mol% yttria-stabilized tetragonal zirconia polycrystal ceramics with 0.25 wt% alumina

Microstructure of rapidly‐quenched ZrO₂‐SiO₂ glass‐ceramics fabricated by container‐less aerodynamic levitation technology

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Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal: Effect of Y3+ distribution in grain interiors

Cited by 17 publications

References 38 publications

Ultrahigh toughness zirconia ceramics

Ultrahigh toughness zirconia ceramics

Defects in the grain interiors of 3 mol% yttria-stabilized tetragonal zirconia polycrystal ceramics with 0.25 wt% alumina

Microstructure of rapidly‐quenched ZrO2‐SiO2 glass‐ceramics fabricated by container‐less aerodynamic levitation technology

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Microstructure of rapidly‐quenched ZrO₂‐SiO₂ glass‐ceramics fabricated by container‐less aerodynamic levitation technology