TY - GEN
T1 - Quantative microstructural analysis of thermal barrier coatings produced by electron beam physical vapor deposition
AU - Kelly, Matthew
AU - Singh, Jogender
AU - Todd, Judith
AU - Copley, Steven
AU - Wolfe, Douglas
PY - 2008
Y1 - 2008
N2 - Thermal Barrier Coatings (TBC) produced by Electron Beam Physical Vapor Deposition (EB-PVD) are used primarily for system critical components of power turbines. The performance of coatings is highly dependant on micro and nano structural features. This paper proposes and demonstrates quantitative microstructural analysis of TBC produced by the EB-PVD. Metallographic techniques were applied to surfaces parallel and perpendicular to the columnar growth direction. Multiple levels perpendicular to the columnar growth direction were prepared to identify descriptive statistical values for coating microstructure throughout coating thickness. Metallographic surfaces were imaged with Scanning Electron Microscopy (SEM) and evaluated with commercial image analysis software. Samples produced with different vapor incidence angles were evaluated by the proposed method and show distinct quantitative differences of column grain size, inter-columnar porosity, and levels of re-nucleation. Microstructural results will be presented as a function of coating thickness and vapor incidence angle.
AB - Thermal Barrier Coatings (TBC) produced by Electron Beam Physical Vapor Deposition (EB-PVD) are used primarily for system critical components of power turbines. The performance of coatings is highly dependant on micro and nano structural features. This paper proposes and demonstrates quantitative microstructural analysis of TBC produced by the EB-PVD. Metallographic techniques were applied to surfaces parallel and perpendicular to the columnar growth direction. Multiple levels perpendicular to the columnar growth direction were prepared to identify descriptive statistical values for coating microstructure throughout coating thickness. Metallographic surfaces were imaged with Scanning Electron Microscopy (SEM) and evaluated with commercial image analysis software. Samples produced with different vapor incidence angles were evaluated by the proposed method and show distinct quantitative differences of column grain size, inter-columnar porosity, and levels of re-nucleation. Microstructural results will be presented as a function of coating thickness and vapor incidence angle.
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M3 - Conference contribution
AN - SCOPUS:49549098581
SN - 9780470196342
T3 - Ceramic Engineering and Science Proceedings
SP - 71
EP - 80
BT - Advanced Ceramic Coatings and Interfaces II - A Collection of Papers Presented at the 31st International Conference on Advanced Ceramics and Composites
T2 - 31st International Conference on Advanced Ceramics and Composites
Y2 - 21 January 2007 through 26 January 2007
ER -