Yttria-stabilized-zirconia hollow spheres prepared by atmospheric plasma spray |
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| Institution: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Institute of New Materials, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China;3. School of Public Health, Shandong University, Jinan 250012, China;1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;2. China Aviation Industry Corporation of China, Beijing 100022, China;3. Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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| Abstract: | Yttria-stabilized-zirconia (YSZ) hollow spheres are widely utilized for their novel physical and chemical properties. However, developing a simple and low-cost method for preparing such hollow spheres still remains a great challenge. In this paper, an atmospheric plasma spray (APS) method is introduced, and the formation mechanism of hollow 7YSZ (ZrO2-7wt%Y2O3) spheres is presented. The hollow sphere morphology was observed by scanning electron microscopy (SEM) when agglomerated and sintered 7YSZ powders were used. Additionally, additive composition changes, phase transformations, and the thermal behavior of 7YSZ powders were analyzed by energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD), thermogravimetric analysis (TG) and differential scanning calorimeter analysis (DSC). Furthermore, the phase transformations of agglomerated and sintered 7YSZ powders, 7YSZ hollow spheres that annealed at various temperatures for different times are analyzed. |
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| Keywords: | Yttria-stabilized-zirconia Atmospheric plasma spray Spheroidization Phase transformation |
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