Ti2AlC MAX phase for resistance against CMAS attack to thermal barrier coatings
Guo, Lei1,2; Yan, Zheng1; Wang, Xiaohui3; He, Quanjun1
Corresponding AuthorGuo, Lei(
AbstractTo protect thermal barrier coatings (TBCs) from calcium-magnesium-alumina-silicate (CMAS) attack, depositing a protective layer has been a promising approach. In this study, a MAX phase compound, Ti2AlC, is found to highly resist to CMAS attack, which could be a candidate material for the protective layer. The interaction between Ti2AlC pellets and molten CMAS at 1250 degrees C for 0.5 h, 2 h and 8 h was investigated. Exposed to CMAS melt for 0.5 h, a dense Al2O3 film formed on the surface, accompanied by Al and Ti migrating to the melt. The accumulation of Al and Ti in CMAS triggered its crystallization, forming anorthite and melilite phases. The Al2O3 film and the crystallization of the melt significantly suppressed the CMAS penetration. The film and crystals grew with the heat time. By comparison, some pre-oxidized Ti2AlC pellets were also exposed to CMAS attack at 1250 degrees C. The CMAS on the pre-oxidized pellets only precipitated CaAl2Si2O8 anorthite crystals, which exhibited much lower sizes than those in the non-oxidized samples. Also, the pre-oxidized pellets were highly resistant to CMAS penetration.
KeywordThermal barrier coatings (TBCs) Calcium-magnesium-alumina-silicate (CMAS) MAX phases Ti2AlC Protective layers
Funding OrganizationNational Natural Science Foundation of China ; Natural Science Foundation of Tianjin
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51501127] ; Natural Science Foundation of Tianjin[16JCQNJC02900] ; Natural Science Foundation of Tianjin[16JCYBJC18700]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Ceramics
WOS IDWOS:000460492200130
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGuo, Lei
Affiliation1.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
2.Minist Educ, Tianjin Key Lab Adv Joining Technol, Key Lab Adv Ceram & Machining Technol, Tianjin 300072, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
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GB/T 7714
Guo, Lei,Yan, Zheng,Wang, Xiaohui,et al. Ti2AlC MAX phase for resistance against CMAS attack to thermal barrier coatings[J]. CERAMICS INTERNATIONAL,2019,45(6):7627-7634.
APA Guo, Lei,Yan, Zheng,Wang, Xiaohui,&He, Quanjun.(2019).Ti2AlC MAX phase for resistance against CMAS attack to thermal barrier coatings.CERAMICS INTERNATIONAL,45(6),7627-7634.
MLA Guo, Lei,et al."Ti2AlC MAX phase for resistance against CMAS attack to thermal barrier coatings".CERAMICS INTERNATIONAL 45.6(2019):7627-7634.
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