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Microstructural and Mechanical Property Evolutions of Plasma-Sprayed YSZ Coating During High-Temperature Exposure: Comparison Study Between 8YSZ and 20YSZ

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Abstract

Plasma-sprayed YSZ coatings, serving as the thermal insulating top coating for thermal barrier coatings, involve thermally activated microstructural evolution, which may change the physical and mechanical properties and thereby influence the thermal barrier performance and service lifetime. In this study, 8YSZ and 20YSZ coatings annealed at 1300 °C were comparatively investigated to understand the effects of phase structure on the sintering behavior. Results show that, compared with the 20YSZ coating consisting of mainly thermodynamically stable cubic phase, the as-sprayed 8YSZ coating presented a multiphase structure mainly composed of thermodynamically metastable tetragonal phase, and significant phase transformation occurred during high-temperature exposure. The lamellar bonding had significantly improved because of the healing of intersplat pores. Fracture toughness, microhardness, and elastic modulus increased with sintering duration. The 8YSZ coating exhibiting the thermodynamically metastable tetragonal phase structure experienced a slower sintering kinetics than the 20YSZ coatings consisting mainly of thermodynamically stable cubic phase.

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Acknowledgments

This research project was supported by the National Basic Research Program of China (No. 2012CB625100, No. 2013CB035701), the National Natural Science Foundation for the Distinguished Young scholars (Grant No. 50725101), and the Program for New Century Excellent Talents in University (No. NCET-08-0443).

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  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, People’s Republic of China

    Guan-Jun Yang, Zheng-Long Chen, Cheng-Xin Li & Chang-Jiu Li

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  1. Guan-Jun Yang
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Correspondence to Chang-Jiu Li.

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This article is an invited paper selected from presentations at the 5th Asian Thermal Spray Conference (ATSC 2012) and has been expanded from the original presentation. ATSC 2012 was held at the Tsukuba International Congress Center, Ibaraki, Japan, November 26-28, 2012, and was organized by the Japan Thermal Spray Society and the Asian Thermal Spray Society.

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Yang, GJ., Chen, ZL., Li, CX. et al. Microstructural and Mechanical Property Evolutions of Plasma-Sprayed YSZ Coating During High-Temperature Exposure: Comparison Study Between 8YSZ and 20YSZ. J Therm Spray Tech 22, 1294–1302 (2013). https://doi.org/10.1007/s11666-013-9986-8

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