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Coatings 2017, 7(9), 150; https://doi.org/10.3390/coatings7090150

Effect of Particle Size on the Thermal Shock Resistance of Plasma-Sprayed YSZ Coatings

1
Key Laboratory of Pressure System and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
2
Shanghai Junshan Surface Technology Engineering Co., Ltd., Shanghai 201900, China
*
Author to whom correspondence should be addressed.
Received: 18 August 2017 / Revised: 12 September 2017 / Accepted: 18 September 2017 / Published: 19 September 2017
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Abstract

In this study, yttria-stabilized zirconia (YSZ) coatings were deposited by atmospheric plasma spraying (APS) using feedstocks with two different particle sizes. The effect of particle size on the pore structure and failure mechanism of the coatings was investigated. The evolution of the pore structure of the two kinds of coatings during cyclic thermal shock test was described by quantitative metallography. The influence of pore orientation on the thermal stress of the coating system was analyzed by the finite element method. It was found that the coatings deposited using coarse particles show a high thermal shock life time. The orientation of the pores in the coatings prepared by different particle sizes was different. A structural parameter was proposed to effectively characterize the pore orientation of the coatings. Coatings prepared by coarse YSZ powder tend to form almost the same number of horizontal and vertical pores, while coatings prepared by fine powder tend to form horizontal ones parallel to the direction of the substrate. The simulation results revealed that the vertical pores can reduce the thermal stress in the coating. The results of this investigation are a benefit to the design and integrity of TBCs. View Full-Text
Keywords: thermal barrier coatings; YSZ; particle size; pore; thermal shocks; stress thermal barrier coatings; YSZ; particle size; pore; thermal shocks; stress
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Huang, J.; Wang, W.; Lu, X.; Hu, D.; Feng, Z.; Guo, T. Effect of Particle Size on the Thermal Shock Resistance of Plasma-Sprayed YSZ Coatings. Coatings 2017, 7, 150.

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