Texture and microstructure of ZrO2-4mol% Y2O3 layers obliquely deposited by EB-PVD

Observing texture and microstructure growth in coating layers during oblique deposition provides the most fundamental information to optimize the process parameters of the deposition process. In this study, the columnar structure of 4 mol% Y2O3 partially stabilized ZrO2 (YSZ) coating layers produced...

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Bibliographic Details
Published in:Surface & coatings technology 2006-01, Vol.200 (8), p.2725-2730
Main Authors: Wada, Kunihiko, Yoshiya, Masato, Yamaguchi, Norio, Matsubara, Hideaki
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Electron beam evaporation
Exact sciences and technology
Materials science
Metals. Metallurgy
Monte Carlo simulation
Nonmetallic coatings
Other topics in materials science
Physics
Production techniques
Scanning electron microscopy (SEM)
Surface treatment
Thermal barrier coatings
X-ray diffraction
Zirconium oxide
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Summary:Observing texture and microstructure growth in coating layers during oblique deposition provides the most fundamental information to optimize the process parameters of the deposition process. In this study, the columnar structure of 4 mol% Y2O3 partially stabilized ZrO2 (YSZ) coating layers produced by electron beam physical vapor deposition (EB-PVD) process was experimentally investigated. Most results could be summarized as a function of vapor incident angle (VIA), α. While a mixture of and textured columns was observed in the samples deposited at a low α less than 30°, single textured columns were observed at a high α (>30°). Therefore, the was the preferential crystallographic growth direction under oblique deposition. However, the direction of did not accord with the geometric growth direction of the columns, which is approximately predicted based on so-called the tangent rule. It is likely that the mismatch between these directions results in the formation of feather-like structure, which has been commonly reported. In addition to crystallographic observation, the porosities in the coating layers were investigated. The tendency of the porosity with the change of VIA qualitatively agreed with the previously reported prediction based on the Monte Carlo simulation method.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2005.02.121