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Acoustic emission monitoring and damage mode discrimination of APS thermal barrier coatings under high temperature CMAS corrosion
Yang L; Yang TT; Zhou YC; Wei YG(魏悦广); Wu RT; Wang NG; Yang, L; Zhou, YC (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China.
Source PublicationSURFACE & COATINGS TECHNOLOGY
2016
Volume304Pages:272-282
ISSN0257-8972
AbstractMolten calcium-magnesium-alumino-silicate (CMAS) corrosion is the most dangerous failure mode for thermal barrier coatings (TBCs). The real-time monitoring and mode discrimination of the corrosion failure process are desirable to understand the corrosion failure mechanism of TBCs. In this paper, the failure mechanism of the TBCs subjected to molten CMAS attack is investigated with acoustic emission (AE). Based on the number and amplitude, and compared to the substrate and the TBCs without CMAS, more serious damage is found to occur in the TBCs attacked by the molten CMAS. Possible failure modes are discriminated by wavelet analysis, and the results indicate that there are four distinct frequency bands corresponding to surface vertical cracks, sliding interface cracks, opening interface cracks, and substrate deformation in the TBCs suffered high temperature molten CMAS corrosion. In fact, the frequency band of sliding interface crack is associated with two crack types, including the crack at the YSZ/BC interface and the parallel crack in the ceramic coating induced by the compressive stress. These two cracks dominate the whole failure process, and ultimately result in the spallation of coatings. (C) 2016 Elsevier B.V. All rights reserved.
KeywordThermal Barrier Coatings Acoustic Emission Wavelet Packet Transform Cmas Corrosion Damage Mode
DOI10.1016/j.surfcoat.2016.06.080
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000384775900032
WOS KeywordThermal barrier coatings ; Acoustic emission ; Wavelet packet transform ; CMAS corrosion ; Damage mode
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
Funding OrganizationThis work was supported by the National Natural Science Foundation of China (grant nos. 51590891, 11272275, 11472237, and 11432014).
DepartmentLNM新型材料及结构的多尺度力学
Classification二类
RankingFalse
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59708
Collection非线性力学国家重点实验室
Corresponding AuthorYang, L; Zhou, YC (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China.
Recommended Citation
GB/T 7714
Yang L,Yang TT,Zhou YC,et al. Acoustic emission monitoring and damage mode discrimination of APS thermal barrier coatings under high temperature CMAS corrosion[J]. SURFACE & COATINGS TECHNOLOGY,2016,304:272-282.
APA Yang L.,Yang TT.,Zhou YC.,魏悦广.,Wu RT.,...&Zhou, YC .(2016).Acoustic emission monitoring and damage mode discrimination of APS thermal barrier coatings under high temperature CMAS corrosion.SURFACE & COATINGS TECHNOLOGY,304,272-282.
MLA Yang L,et al."Acoustic emission monitoring and damage mode discrimination of APS thermal barrier coatings under high temperature CMAS corrosion".SURFACE & COATINGS TECHNOLOGY 304(2016):272-282.
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