Yttria-stabilized-zirconia hollow spheres prepared by atmospheric plasma spray--颗粒学报PARTICUOLOGY

Zhang, X., Zhou, K., Chang, F., Song, C., Deng, C., & Liang, S. (2014). Yttria-stabilized-zirconia hollow spheres prepared by atmospheric plasma spray. Particuology, 14, 57–62. https://doi.org/10.1016/j.partic.2013.06.003

Yttria-stabilized-zirconia hollow spheres prepared by atmospheric plasma spray

Xiaofeng Zhang ^{a b}, Kesong Zhou ^{a b *}, Fa Chang ^{a b}, Chen Song ^b, Chunming Deng ^b, Siyuan Liang ^c

a School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
b Institute of New Materials, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China
c School of Public Health, Shandong University, Jinan 250012, China

10.1016/j.partic.2013.06.003

Volume 14, June 2014, Pages 57-62

Received 18 February 2013, Revised 4 June 2013, Accepted 26 June 2013, Available online 12 August 2013.

E-mail: ksZhou2004@163.com

Highlights

• ZrO₂-7wt%Y₂O₃ (7YSZ) hollow spheres were prepared by atmospheric plasma spray with 7YSZ powders.

• The as-prepared hollow spheres have similar composition and phases to the raw 7YSZ powders.

• No phase transformation appeared when annealing temperature below 1400 °C.

• Segregation of doped Mg, Al in produced spheres during APS and annealing processes was observed.

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.

Graphical abstract

Keywords

Yttria-stabilized-zirconia; Atmospheric plasma spray; Spheroidization; Phase transformation

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