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Coatings 2018, 8(7), 245; https://doi.org/10.3390/coatings8070245

Preparation of Yttria-Stabilized Zirconia Hollow Sphere with Reduced Shell Thickness by Controlling Ambient Temperature during Plasma Process

1
State Key Lab for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
Xi’an Aerospace Composite Research Institute, China Aerospace Science and Technology Corporation, Xi’an 710025, China
*
Author to whom correspondence should be addressed.
Received: 30 May 2018 / Revised: 29 June 2018 / Accepted: 8 July 2018 / Published: 11 July 2018
(This article belongs to the Special Issue From Metallic Coatings to Additive Manufacturing)
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Abstract

Yttria-stabilized zirconia (YSZ) hollow sphere (HS) powder is a novel potential feedstock material for the plasma spraying of next generation advanced thermal barrier coatings with low thermal conductivity and high sintering resistibility. In this study, YSZ HS powders were prepared by plasma treatment with/without a heat preservation zone around the flying path of the particles during plasma flame. The results of the scanning electron microscopy of YSZ HS powders showed that HS prepared with a heat preservation zone during the plasma process exhibited a regular spherical morphology and a homogeneous thin shell structure. Due to the sufficient heating of the shell regions, the HS powder presented a well densified shell structure. Furthermore, the mechanism of formation of the HS powder with reduced shell thickness was also discussed based on the analysis of the evolution of the powder structure. This kind of hollow sphere powder with a very thin shell structure provides a new alternative feedstock material for the development of next generation high performance thermal barrier coatings. View Full-Text
Keywords: yttria-stabilized zirconia; hollow sphere; shell thickness; plasma process yttria-stabilized zirconia; hollow sphere; shell thickness; plasma process
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Zhao, L.; Zhang, Z.; Duan, Y.; Cui, H.; Gao, Y. Preparation of Yttria-Stabilized Zirconia Hollow Sphere with Reduced Shell Thickness by Controlling Ambient Temperature during Plasma Process. Coatings 2018, 8, 245.

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