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Open AccessArticle

Thermal Stability of YSZ Coatings Deposited by Plasma Spray–Physical Vapor Deposition

by Zefei Cheng 1,2, Jiasheng Yang 1,2,*, Fang Shao 1,2, Xinghua Zhong 1,2, Huayu Zhao 1,2, Yin Zhuang 1,2, Jinxing Ni 1,2 and Shunyan Tao 1,2,*
1
The Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 201899, China
2
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(8), 464; https://doi.org/10.3390/coatings9080464
Received: 18 April 2019 / Revised: 19 July 2019 / Accepted: 22 July 2019 / Published: 24 July 2019
(This article belongs to the Special Issue Science and Technology of Thermal Barrier Coatings)
The plasma spray–physical vapor deposition (PS–PVD) process has received considerable attention due to its non-line of sight deposition ability, high deposition rates, and cost efficiency. Compared with electron beam–physical vapor deposition (EB–PVD), PS–PVD can also prepare thermal barrier coatings (TBCs) with columnar microstructures. In this paper, yttria-stabilized zirconia (YSZ) coatings were fabricated by PS–PVD. Results showed that the as-deposited coating presented a typical columnar structure and was mainly composed of metastable tetragonal (t′-ZrO2) phase. With thermal exposure, the initial t′ phase of YSZ evolved gradually into monoclinic (m-ZrO2) phase. Significant increase in hardness (H) and the Young’s modulus (E) of the coating was attributed to the sintering effect of the coating during the thermal exposure, dependent on exposure temperature and time. However, the values of H and E decreased in the coatings thermally treated at 1300–1500 °C for 24 h, which is mainly affected by the formation of m-ZrO2 phase. View Full-Text
Keywords: plasma spray–physical vapor deposition; thermal stability; thermal barrier coatings plasma spray–physical vapor deposition; thermal stability; thermal barrier coatings
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Cheng, Z.; Yang, J.; Shao, F.; Zhong, X.; Zhao, H.; Zhuang, Y.; Ni, J.; Tao, S. Thermal Stability of YSZ Coatings Deposited by Plasma Spray–Physical Vapor Deposition. Coatings 2019, 9, 464.

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