Quantative microstructural analysis of thermal barrier coatings produced by electron beam physical vapor deposition

Matthew Kelly, Jogender Singh, Judith Todd, Steven Copley, Douglas Wolfe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationAdvanced Ceramic Coatings and Interfaces II - A Collection of Papers Presented at the 31st International Conference on Advanced Ceramics and Composites
Pages71-80
Number of pages10
Edition3
StatePublished - 2008
Event31st International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: Jan 21 2007Jan 26 2007

Publication series

NameCeramic Engineering and Science Proceedings
Number3
Volume28
ISSN (Print)0196-6219

Other

Other31st International Conference on Advanced Ceramics and Composites
CountryUnited States
CityDaytona Beach, FL
Period1/21/071/26/07

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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