Yttria-stabilized-zirconia hollow spheres prepared by atmospheric plasma spray_中国颗粒学会

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Partic. vol. 14 pp. 57-62 (June 2014)
doi: 10.1016/j.partic.2013.06.003

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

Xiaofeng Zhanga,b, Kesong Zhoua,b,*, Fa Changa,b, Chen Songb, Chunming Dengb, Siyuan Liangc

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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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