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Journal of Advanced Ceramics 2022, 11(6): 945-960 https://doi.org/10.1007/s40145-022-0588-0
Research Article | Open Access | Issue | Published: 11 May 2022

Effects of pellet surface roughness and pre-oxidation temperature on CMAS corrosion behavior of Ti2AlC

Show Author's Information Lei GUOa,b( ),  Guang LIa,  Jing WUc,  Xiaohui WANGd
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Tianjin Key Laboratory of Advanced Joining Technology, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin 300072, China
School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Keywords:
surface roughness, thermal cycling, thermal barrier coatings (TBCs), Ti2AlC, pre-oxidation temperature, calcium-magnesium-alumina-silicate (CMAS) corrosion
Cite this article:
GUO L, LI G, WU J, et al. Effects of pellet surface roughness and pre-oxidation temperature on CMAS corrosion behavior of Ti2AlC. Journal of Advanced Ceramics, 2022, 11(6): 945-960. https://doi.org/10.1007/s40145-022-0588-0
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Abstract Full text About this article

Calcium-magnesium-alumina-silicate (CMAS) corrosion is a serious threat to thermal barrier coatings (TBCs). Ti2AlC has been proven to be a potential protection layer material for TBCs to resist CMAS corrosion. In this study, the effects of the pellet surface roughness and temperature on the microstructure of the pre-oxidation layer and CMAS corrosion behavior of Ti2AlC were investigated. The results revealed that pre-oxidation produced inner Al2O3 layer and outer TiO2 clusters on the pellet surfaces. The content of TiO2 decreased with decreasing pellet surface roughness and increased along with the pre-oxidation temperature. The thickness of Al2O3 layer is also positively related to the pre-oxidation temperature. The Ti2AlC pellets pre-oxidized at 1050 ℃ could effectively resist CMAS corrosion by promoting the crystallization of anorthite (CaAl2Si2O8) from the CMAS melt rapidly, and the resistance effectiveness increased with the pellet surface roughness. Additionally, the CMAS layer mainly spalled off at the interface of CaAl2Si2O8/Al2O3 layer after thermal cycling tests coupled with CMAS corrosion. The Al2O3 layer grown on the rough interface could combine with the pellets tightly during thermal cycling tests, which was attributed to obstruction of the rough interface to crack propagation.


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About this article

Effects of pellet surface roughness and pre-oxidation temperature on CMAS corrosion behavior of Ti2AlC

Show Author's information Lei GUOa,b( ), Guang LIa, Jing WUc, Xiaohui WANGd
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Tianjin Key Laboratory of Advanced Joining Technology, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin 300072, China
School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract

Calcium-magnesium-alumina-silicate (CMAS) corrosion is a serious threat to thermal barrier coatings (TBCs). Ti2AlC has been proven to be a potential protection layer material for TBCs to resist CMAS corrosion. In this study, the effects of the pellet surface roughness and temperature on the microstructure of the pre-oxidation layer and CMAS corrosion behavior of Ti2AlC were investigated. The results revealed that pre-oxidation produced inner Al2O3 layer and outer TiO2 clusters on the pellet surfaces. The content of TiO2 decreased with decreasing pellet surface roughness and increased along with the pre-oxidation temperature. The thickness of Al2O3 layer is also positively related to the pre-oxidation temperature. The Ti2AlC pellets pre-oxidized at 1050 ℃ could effectively resist CMAS corrosion by promoting the crystallization of anorthite (CaAl2Si2O8) from the CMAS melt rapidly, and the resistance effectiveness increased with the pellet surface roughness. Additionally, the CMAS layer mainly spalled off at the interface of CaAl2Si2O8/Al2O3 layer after thermal cycling tests coupled with CMAS corrosion. The Al2O3 layer grown on the rough interface could combine with the pellets tightly during thermal cycling tests, which was attributed to obstruction of the rough interface to crack propagation.

Keywords: surface roughness, thermal cycling, thermal barrier coatings (TBCs), Ti2AlC, pre-oxidation temperature, calcium-magnesium-alumina-silicate (CMAS) corrosion

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Publication history

Received: 07 December 2021
Revised: 03 March 2022
Accepted: 20 March 2022
Published: 11 May 2022
Issue date: June 2022

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© The Author(s) 2022.

Acknowledgements

This research is sponsored by the National Natural Science Foundation of China (Grant No. 51971156).

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