Size-driven phase transformation and microstructure evolution of ZrO2 nanocrystallites associated with thermal treatments

Fu, Le; Li, Bo; Gong, Xu; Huang, Jiwu; Engqvist, Håkan; Xia, Wei

doi:10.1016/j.jeurceramsoc.2021.04.058

Cited by 31 publications

(21 citation statements)

References 28 publications

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“…As a result, there exists a critical crystallite size below which t‐ZrO 2 is more stable than m‐ZrO 2 . In our previous study, we have observed similar size‐driven m‐ZrO 2 to t‐ZrO 2 phase transformation during the annealing process of ZrO 2 –SiO 2 NCGCs 21 . In the present study, the sizes of m‐ZrO 2 and t‐ZrO 2 nanocrystallites in the fiber samples were smaller than 30 nm (Table 1).…”

Section: Resultssupporting

confidence: 79%

“…In our previous study, we have observed similar size-driven m-ZrO 2 to t-ZrO 2 phase transformation during the annealing process of ZrO 2 -SiO 2 NCGCs. 21 In the present study, the sizes of m-ZrO 2 and t-ZrO 2 nanocrystallites in the fiber samples were smaller than 30 nm (Table 1). The m-ZrO 2 to t-ZrO 2 phase transformation occurred during the sintering process (800 • C, Figure 11A) can also be attributed to the size-driven effect.…”

mentioning

confidence: 42%

“…The volume percentage of m‐ZrO 2 and t‐ZrO 2 was also calculated based on XRD results. More detailed information about grain size and phase composition calculations can be found elsewhere 20,21 . Morphology observations of the as‐synthesized and the calcined powder and fracture surfaces of the sintered samples were performed on a scanning electron microscope (SEM, SIRION200, FEI Co., Ltd.).…”

Section: Methodsmentioning

confidence: 99%

“…More detailed information about grain size and phase composition calculations can be found elsewhere. 20,21 Morphology observations of the as-synthesized and the calcined powder and fracture surfaces of the sintered samples were performed on a scanning electron microscope (SEM, SIRION200, FEI Co., Ltd.). N 2 adsorption-desorption isotherms of the 600 • C-calcined particle sample and 1100 • C-calcined fiber sample were collected on a gas adsorption analyzer (Micromeritics Tristar 3020, USA) at 77 K after degassing at 573 K for overnight in a nitrogen stream.…”

Section: Materials Characterizationsmentioning

confidence: 99%

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Influences of powder morphology on the densification and microstructure of a ZrO₂‐based nanocrystalline glass–ceramic

Cheng

et al. 2022

J Am Ceram Soc.

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Morphology is an important characteristic of raw powder utilized for ceramic sintering but the role of powder morphology is mostly overlooked. In this study, two types of ZrO2–SiO2 powder with different morphologies (fiber and particle) were synthesized by blow spinning and sol–gel method, respectively, followed by direct current electric field‐assisted hot pressing (FAHP) to obtain nanocrystalline glass–ceramics (NCGCs). Results showed that the two as‐synthesized powders had different pyrolysis behaviors. The two types of as‐synthesized powders were amorphous and tetragonal‐ZrO2 nanocrystallites first formed after calcination at 800°C. During FAHP, the particle powder can be densified at a lower temperature than that of the fiber powder, due to the facts that the particle powder showed higher specific surface area and higher densification driving force. The fiber powder was predominately densified by fiber fusion and plastic deformation, whereas the particle powder was densified via particle fusion. Both the two types of powder can be fully densified to obtain ZrO2–SiO2 NCGCs at 1230°C for 4 min. Tetragonal‐ZrO2 nanocrystallites in the NCGCs with particles as raw powder showed higher stability than those in the NCGCs with fibers as raw powder.

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Section: Resultssupporting

confidence: 79%

mentioning

confidence: 42%

Section: Methodsmentioning

confidence: 99%

Section: Materials Characterizationsmentioning

confidence: 99%

See 2 more Smart Citations

Influences of powder morphology on the densification and microstructure of a ZrO₂‐based nanocrystalline glass–ceramic

Cheng

et al. 2022

J Am Ceram Soc.

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“…The authors [20] studied the microstructure evolution of two ZrO 2 -SiO 2 nanocrystalline glass-ceramics (NCGCs) in relation to thermal treatment modes. NCGCs were composed of monoclinic (m) and tetragonal (t) ZrO 2 nanocrystallites and an amorphous SiO 2 compound.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sintering Temperature on the Phase Composition, Microstructure, and Mechanical Properties of Yttria-Stabilized Zirconia

et al. 2022

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It is known that the yttria-stabilized zirconia (YSZ) material has superior thermal, mechanical, and electrical properties. This material is used for manufacturing products and components of air heaters, hydrogen reformers, cracking furnaces, fired heaters, etc. This work is aimed at searching for the optimal sintering mode of YSZ ceramics that provides a high crack growth resistance. Beam specimens of ZrO2 ceramics doped with 6, 7, and 8 mol% Y2O3 (hereinafter: 6YSZ, 7YSZ, and 8YSZ) were prepared using a conventional sintering technique. Four sintering temperatures (1450 °C, 1500 °C, 1550 °C, and 1600 °C) were used for the 6YSZ series and two sintering temperatures (1550 °C and 1600 °C) were used for the 7YSZ and 8YSZ series. The series of sintered specimens were ground and polished to reach a good surface quality. Several mechanical tests of the materials were performed, namely, the microhardness test, fracture toughness test by the indentation method, and single-edge notch beam (SENB) test under three-point bending. Based on XRD analysis, the phase balance (percentages of tetragonal, cubic, and monoclinic ZrO2 phases) of each composition was substantiated. The morphology of the fracture surfaces of specimens after both the fracture toughness tests was studied in relation to the mechanical behavior of the specimens and the microstructure of corresponding materials. SEM-EDX analysis was used for microstructural characterization. It was found that both the yttria percentage and sintering temperature affect the mechanical behavior of the ceramics. Optimal chemical composition and sintering temperature were determined for the studied series of ceramics. The maximum transformation toughening effect was revealed for ZrO2-6 mol% Y2O3 ceramics during indentation. However, in the case of a SENB test, the maximum transformation toughening effect in the crack tip vicinity was found in ZrO2-7 mol% Y2O3 ceramics. The conditions for obtaining YSZ ceramics with high fracture toughness are discussed.

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Preparation and properties of yttria-stabilized tetragonal phase zirconia nano-ceramics by high gravity

Liang

Yuan

et al. 2023

Appl. Phys. A

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Size-driven phase transformation and microstructure evolution of ZrO2 nanocrystallites associated with thermal treatments

Cited by 31 publications

References 28 publications

Influences of powder morphology on the densification and microstructure of a ZrO₂‐based nanocrystalline glass–ceramic

Influences of powder morphology on the densification and microstructure of a ZrO₂‐based nanocrystalline glass–ceramic

The Effect of Sintering Temperature on the Phase Composition, Microstructure, and Mechanical Properties of Yttria-Stabilized Zirconia

Preparation and properties of yttria-stabilized tetragonal phase zirconia nano-ceramics by high gravity

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Size-driven phase transformation and microstructure evolution of ZrO2 nanocrystallites associated with thermal treatments

Cited by 31 publications

References 28 publications

Influences of powder morphology on the densification and microstructure of a ZrO2‐based nanocrystalline glass–ceramic

Influences of powder morphology on the densification and microstructure of a ZrO2‐based nanocrystalline glass–ceramic

The Effect of Sintering Temperature on the Phase Composition, Microstructure, and Mechanical Properties of Yttria-Stabilized Zirconia

Preparation and properties of yttria-stabilized tetragonal phase zirconia nano-ceramics by high gravity

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Influences of powder morphology on the densification and microstructure of a ZrO₂‐based nanocrystalline glass–ceramic

Influences of powder morphology on the densification and microstructure of a ZrO₂‐based nanocrystalline glass–ceramic