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Volume 14
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10.3390/coatings14080938
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Article

Self-Healing and Thermal Stability of LaMgAl11O19-Ti3AlC2 Composites for High-Temperature Abradable Applications

by
Jingqi Huang
,
Wenbo Chen
,
Kaiyue Lü
,
Mingyi Xu
,
Longhui Deng
,
Jianing Jiang
,
Shujuan Dong
,
Meizhu Chen
* and
Xueqiang Cao
*
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
*
Authors to whom correspondence should be addressed.
Coatings 2024, 14(8), 938; https://doi.org/10.3390/coatings14080938
Submission received: 2 July 2024 / Revised: 21 July 2024 / Accepted: 24 July 2024 / Published: 26 July 2024
(This article belongs to the Special Issue Ceramic Materials and Coatings: Materials, Fabrication, and Applications)
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Abstract

Defects such as interconnected pores and cracks can improve the abradability of ceramic-based abradable sealing coatings (ASCs) but may reduce the lifetime. Self-healing can potentially close cracks and transform interconnected pores into isolated ones through filling and sintering effects. Ti3AlC2 (TAC) was incorporated into LaMgAl11O19 (LMA) as both the self-healing agent and sintering aid, and plasma-sprayed LMA-based composite coatings were annealed at 1200 °C to assess their self-healing capabilities and then subjected to oxidation in air and corrosion in steam at 1300 °C to study their long-term stability. Results indicated that increasing TAC content significantly enhances self-healing effectiveness, evidenced by the closure of cracks and the isolation of pores. Oxidation and corrosion at 1300 °C led to significant grain growth and the formation of equiaxed grains with an aspect ratio of approximately 3, which may impair the toughening mechanism. Meanwhile, due to the preferential volatilization of Al in a steam environment, LTA decomposed into α-La2/3TiO3 and La4Ti3O12 phases, and the accelerated mass transfer also resulted in grain coarsening. Interestingly, the L20T composite coating with a porosity of 32.17 ± 0.94% and a hardness of 74.88 ± 1.55 HR15Y showed great potential for abradable applications due to its stable phase composition and uniform pore distribution.
Keywords: LaMgAl11O19; Ti3AlC2; abradable sealing coatings; self-healing; sintering LaMgAl11O19; Ti3AlC2; abradable sealing coatings; self-healing; sintering

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MDPI and ACS Style

Huang, J.; Chen, W.; Lü, K.; Xu, M.; Deng, L.; Jiang, J.; Dong, S.; Chen, M.; Cao, X. Self-Healing and Thermal Stability of LaMgAl11O19-Ti3AlC2 Composites for High-Temperature Abradable Applications. Coatings 2024, 14, 938. https://doi.org/10.3390/coatings14080938

AMA Style

Huang J, Chen W, Lü K, Xu M, Deng L, Jiang J, Dong S, Chen M, Cao X. Self-Healing and Thermal Stability of LaMgAl11O19-Ti3AlC2 Composites for High-Temperature Abradable Applications. Coatings. 2024; 14(8):938. https://doi.org/10.3390/coatings14080938

Chicago/Turabian Style

Huang, Jingqi, Wenbo Chen, Kaiyue Lü, Mingyi Xu, Longhui Deng, Jianing Jiang, Shujuan Dong, Meizhu Chen, and Xueqiang Cao. 2024. "Self-Healing and Thermal Stability of LaMgAl11O19-Ti3AlC2 Composites for High-Temperature Abradable Applications" Coatings 14, no. 8: 938. https://doi.org/10.3390/coatings14080938

APA Style

Huang, J., Chen, W., Lü, K., Xu, M., Deng, L., Jiang, J., Dong, S., Chen, M., & Cao, X. (2024). Self-Healing and Thermal Stability of LaMgAl11O19-Ti3AlC2 Composites for High-Temperature Abradable Applications. Coatings, 14(8), 938. https://doi.org/10.3390/coatings14080938

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