Mechanisms of La2Ce2O7/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion

Xia, Jie; Du, Xuelin; Xiao, Yiqi; Zhang, Ling; Wu, Rudder Tse; Matsushita, Yoshitaka

doi:10.3390/coatings14070877

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Mechanisms of La₂Ce₂O₇/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion

by

Jie Xia

^1,*

,

Xuelin Du

¹,

Yiqi Xiao

²,

Ling Zhang

^3,*,

Rudder Tse Wu

⁴ and

Yoshitaka Matsushita

⁵

¹

Department of Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002, China

²

Department of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China

³

International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

⁴

High Temperature Materials Group, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0044, Ibaraki, Japan

⁵

Chemical Analysis and X-ray Diffraction Group, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0044, Ibaraki, Japan

^*

Authors to whom correspondence should be addressed.

Coatings 2024, 14(7), 877; https://doi.org/10.3390/coatings14070877

Submission received: 24 June 2024 / Revised: 10 July 2024 / Accepted: 11 July 2024 / Published: 12 July 2024

(This article belongs to the Special Issue Thermal Barrier Coatings: Design, Characterization, Failure Analysis, and Applications)

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Abstract

To tackle the ever-increasing operating temperature of aero-engines, a La₂Ce₂O₇(LCO)/yttria partially stabilized zirconia (YSZ) double-layer thermal barrier coating (TBC) was investigated. The LCO/YSZ double-layer samples were annealed with volcanic ash (VA) at 1250 °C to assess their stability in comparison with that of standard single-layer YSZ. The findings showed that the double-layer system exhibited greater resistance to VA damage than the single-layer YSZ coating. The corrosion mechanism was characterized by a rapid crystallization reaction between LCO and VA, where the kinetics of the solution’s reprecipitation reaction outpaced the penetration rate into the coating′s open pores.

Keywords: thermal barrier coating; calcium–magnesium–alumina–silicate (CMAS); volcanic ash; La₂Ce₂O₇; high-temperature corrosion; corrosion mechanism

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MDPI and ACS Style

Xia, J.; Du, X.; Xiao, Y.; Zhang, L.; Wu, R.T.; Matsushita, Y. Mechanisms of La₂Ce₂O₇/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion. Coatings 2024, 14, 877. https://doi.org/10.3390/coatings14070877

AMA Style

Xia J, Du X, Xiao Y, Zhang L, Wu RT, Matsushita Y. Mechanisms of La₂Ce₂O₇/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion. Coatings. 2024; 14(7):877. https://doi.org/10.3390/coatings14070877

Chicago/Turabian Style

Xia, Jie, Xuelin Du, Yiqi Xiao, Ling Zhang, Rudder Tse Wu, and Yoshitaka Matsushita. 2024. "Mechanisms of La₂Ce₂O₇/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion" Coatings 14, no. 7: 877. https://doi.org/10.3390/coatings14070877

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Mechanisms of La₂Ce₂O₇/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion

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