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Oxidation and phase structure of the bond coat in EB-PVD thermal barrier coatings during thermal cycling
Li, MH; Sun, XF; Zhang, ZY; Gong, SK; Hu, WY; Guan, HR; Hu, ZQ
Corresponding AuthorLi, MH()
2002-01-18
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume38Issue:1Pages:79-83
AbstractAfter depositing Ni-30Cr-12Al-0.3Y (mass fraction, %) bond coat on a Ni base single crystal superalloy by magnetron sputtering, a ceramic top coat (7%Y2O3-ZrO2) was deposited by electron beam-physical vapor deposition (EB-PVD). During thermal cycles, the Y2O3 content in non-equilibrium phases t(')-ZrO2 decreased gradually and the t(')-ZrO2 decomposed gradually to equilibrium t-ZrO2 (transforming to monoclinic phase after cooling) and cubic ZrO2 phase. After 200 thermal cycles, the thermally grown oxides (TGO) layer with 3 mum thickness consists of Al2O3 exclusively, indicating that the sputtered Ni-Cr-Al-Y coating is suitable as bond coat for EB-PVD thermal barrier coatings. With increasing thermal cycles, a small amount of monoclinic m-ZrO2 formed from t-ZrO2. Al was depleted, and NiO and Ni(Al, Cr)(2)O-4 formed near the interface between TGO and bond coat. Stress concentration due to oxide growth and phase transformation between t-m ZrO2 would weaken the combination between top and bond coats, and then cause thermal barrier coating to spall from the substrate.
Keywordthermal barrier coating bond coat oxidation phase transformation thermal cyclic
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000173742700015
PublisherSCIENCE CHINA PRESS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/113790
Collection中国科学院金属研究所
Corresponding AuthorLi, MH
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Beijing Univ Aeronaut & Astronaut, Coll Mat Sci & Engn, Beijing 100083, Peoples R China
3.Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China
Recommended Citation
GB/T 7714
Li, MH,Sun, XF,Zhang, ZY,et al. Oxidation and phase structure of the bond coat in EB-PVD thermal barrier coatings during thermal cycling[J]. ACTA METALLURGICA SINICA,2002,38(1):79-83.
APA Li, MH.,Sun, XF.,Zhang, ZY.,Gong, SK.,Hu, WY.,...&Hu, ZQ.(2002).Oxidation and phase structure of the bond coat in EB-PVD thermal barrier coatings during thermal cycling.ACTA METALLURGICA SINICA,38(1),79-83.
MLA Li, MH,et al."Oxidation and phase structure of the bond coat in EB-PVD thermal barrier coatings during thermal cycling".ACTA METALLURGICA SINICA 38.1(2002):79-83.
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