Synthesis of multi-hierarchical structured yttria-stabilized zirconia powders and their enhanced thermophysical properties

Cao, Fengmei; Gao, Yanfeng; Chen, Hongfei; Liu, Xinling; Tang, Xiaoping; Luo, Hongjie

doi:10.1016/j.jssc.2013.03.022

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…These results demonstrate that our synthetic method restrains the phase transformation from the metastable tetragonal phase to the monoclinic phase. Consequently, tetragonal ZrO 2 was stabilized by yttrium oxide (Y 2 O 3 ), which agrees well with the conclusion reported by Cao et al 27 The TEM images for YSZ in Fig. 4a show a three-dimensional disordered pore structure and that the average diameter of the nanopores is less than 30 nm.…”

Section: Biomimetic Ysz Coating Preparationsupporting

confidence: 91%

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Enhanced thermal shock resistance of ultra-high temperature ceramic by biomimetic surface modification

Zhang

Qiu

et al. 2015

J. Mater. Chem. A

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The manipulation of the heat flow in a ceramic matrix composite is of great importance in industrial and academic fields. Energy flow, as a typical behavior of heat motion in ceramic surfaces can be confined within specific sites during thermal shock experiments, which weakens the temperature gradient distribution, and hence suppresses the crack propagation. The heat flow can be rationally controlled by the introduction of a nanostructured surface with a diverse forced convection coefficient and heat transfer resistance. Taking inspiration from a nanofin surface, yttria-stabilized zirconia (YSZ) nanostructures were fabricated using the sol-gel method. This bio-inspired coating exhibits a high forced convection coefficient (2.884 times) and high heat transfer resistance (30 times) because of the existence of irregular nanowires arrays and a porous nanostructure. The introduction of the nanostructured coating resulted in the rapid depression of the thermal gradient and stress concentration, and the crack propagation was also effectively suppressed. This sol-gel coating method effectively enhanced the thermal shock resistance of the ceramic materials, and indicates the potential for the application of ceramics in extreme environments.

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Section: Biomimetic Ysz Coating Preparationsupporting

confidence: 91%

“…As seen in Fig. Consequently, tetragonal ZrO 2 was stabilized by yttrium oxide (Y 2 O 3 ), which agrees well with the conclusion reported by Cao et al 27 The TEM images for YSZ in Fig. The precursor powders showed good crystallization on the ZrB 2 ceramic matrix composite.…”

Section: Biomimetic Ysz Coating Preparationsupporting

confidence: 88%

Enhanced thermal shock resistance of ultra-high temperature ceramic by biomimetic surface modification

Zhang

Qiu

et al. 2015

J. Mater. Chem. A

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“…The most attractive approach to preparation of porous metal oxides is the sol-gel technology since the discovery of the process for production of mesoporous Al 2 O 3 from aluminum isopropoxide by Tischenko in early 1900s [7]. The possibility to achieve formation of hierarchical porosity, combining macro-, meso-, and microporosity is highly attractive for the applications in question [8]. This is however a recognized challenge for zirconia that is often obtained as materials with closed mesoporosity and especially producing reproducible microporosity in both coatings and bulk material is considered difficult [9].…”

Section: Introductionmentioning

confidence: 99%

Hierarchically porous zirconia through precursor-directed large-scale synthesis

Seisenbaeva

Дударко

Kessler

2018

J Sol-Gel Sci Technol

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Two new precursors, produced by modification of zirconium t-butoxide with 1-dimethylamino-propanol-2 (HDMAP), solid Zr 2 (DMAP) 3 (O t Bu) 5 (1), and liquid Zr 2 (DMAP) 4 (O t Bu) 4 (2), were obtained by reaction of 1.5 and 2 equivalents of HDMAP, respectively, in toluene on Zr(O t Bu) 4 . The produced compounds were characterized by Fourier-transform infrared spectroscopy, 1 H and 13 C nuclear magnetic resonance (NMR), and thermogravimetric analysis (TGA) to estimate their stability and volatility. Action of traces of water in solvents or contact with humid air transforms 1 and 2 into less soluble crystalline Zr 2 (DMAP) 3 (O t Bu) 4 (OH) (3). Molecular structures of compounds 1 and 3 were established using single-crystal X-ray studies and for 2, they were elucidated by applying 2D 1 H-13 C-correlated NMR spectra. The crystals of 1 were subjected to hydrolysis via either storage in ambient atmosphere or immersion into boiling water and the resulting products were characterized by X-ray powder diffraction, TGA, scanning electron microscopy, and atomic force microscopy techniques. The product of hydrolysis in air, ZrO 2 -1, is essentially nonporous, while hydrolysis in boiling water results in ZrO 2 -2 with hierarchical macro-, meso-, and microporosity. Both materials are essentially X-ray amorphous with diffraction patterns appearing as oblique curves, resembling unresolved profiles of the monoclinic baddeleyite structure of ZrO 2 . Heat treatment at 200 and 400°C does not affect essentially the morphology or porosity and leaves the phase composition unchanged, while that at 600°C converts both samples into a tetragonal ZrO 2 phase. The ZrO 2 -2 material is via this treatment losing microporosity and becoming macro-mesoporous with a well-defined pore size of about 3 nm. Heat treatment at 900°C results in collapse of pores and transformation into a well-defined monoclinic baddeleyite structure for both materials.

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Modified hydrothermal treatment route for high-yield preparation of nanosized ZrO2

Yang

Wen

Chen

et al. 2020

Ceramics International

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Synthesis of multi-hierarchical structured yttria-stabilized zirconia powders and their enhanced thermophysical properties

Cited by 4 publications

References 20 publications

Enhanced thermal shock resistance of ultra-high temperature ceramic by biomimetic surface modification

Enhanced thermal shock resistance of ultra-high temperature ceramic by biomimetic surface modification

Hierarchically porous zirconia through precursor-directed large-scale synthesis

Modified hydrothermal treatment route for high-yield preparation of nanosized ZrO2

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