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Coatings 2018, 8(9), 309; https://doi.org/10.3390/coatings8090309

Effect of Particle In-Flight Behavior on the Microstructure and Fracture Toughness of YSZ TBCs Prepared by Plasma Spraying

1
Mechanical and Electrical Engineering Institute, Zhengzhou University of Light Industry, Zhengzhou 450000, China
2
Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou 450000, China
*
Author to whom correspondence should be addressed.
Received: 29 July 2018 / Revised: 20 August 2018 / Accepted: 30 August 2018 / Published: 4 September 2018
(This article belongs to the Special Issue Advanced Ceramic Coatings and Interfaces)
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Abstract

The present study aims to elaborate particle in-flight behavior during plasma spraying and its significance in determining the microstructure and mechanical properties of plasma sprayed yttria partially stabilized zirconia (YSZ) thermal barrier coatings (TBCs). The as-sprayed YSZ coatings were characterized in terms of defects (such as pores, unmelted particles and cracks) and fracture toughness. The results showed that, due to the higher temperature and velocity of in-flight particles in a supersonic atmospheric plasma spraying (SAPS) compared to that of atmospheric plasma spraying (APS), denser coatings were formed leading to a better fracture toughness. The percentage of defects of the microstructure was similar to the temperature and velocity of particles in-flight during plasma spraying. Furthermore, the structural defects had a strong effect on its mechanical behavior. The total defect percentage and fracture toughness in SAPS-TBCs spanned 6.9 ± 0.17%–13.26 ± 0.22% and 2.52 ± 0.06 MPa m1/2–1.78 ± 0.19 MPa m1/2; and 11.11 ± 0.36%–17.15 ± 0.67% and 2.13 ± 0.08 MPa m1/2–1.4 ± 0.12 MPa m1/2 in APS-TBCs. View Full-Text
Keywords: yttria partially stabilized zirconia; supersonic atmospheric plasma spray; defects; fracture toughness yttria partially stabilized zirconia; supersonic atmospheric plasma spray; defects; fracture toughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Xiao, Y.; Ren, E.; Hu, M.; Liu, K. Effect of Particle In-Flight Behavior on the Microstructure and Fracture Toughness of YSZ TBCs Prepared by Plasma Spraying. Coatings 2018, 8, 309.

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