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Coating Stresses in Thermal Barrier Coating by an In Situ Curvature-Monitoring Technique

[+] Author Affiliations
Masayuki Arai

Central Research Institute of Electric Power Industry

Paper No. IMECE2005-79814, pp. 327-334; 8 pages
doi:10.1115/IMECE2005-79814
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Applied Mechanics
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-4212-6 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

In this paper, coating stresses in thermal barrier coating (TBC) changing with a cyclic heating - cooling are measured with a curvature measurement device developed in this study. Coating system chosen in this study is dual-layered structure, and it consists of a partially stabilized zirconia (PSZ) as ceramic coating layer and CoNiCrAlY as metal-bond coating layer. The specimen used here is a strip-plate shape with thin thickness (600μm) extracted chemically from a thermal spraying coated carbon steel. Cyclic heating-cooling test and cyclic heating-cooling test with a dwelling time at a maximum temperature are conducted for the strip-plate specimen. Deflection and coating stresses are measured continuously under these cyclic tests, and thermal deformation mechanisms generating the deflection and coating stresses will be discussed based on a primitive knowledge by an elementary beam theory.

Copyright © 2005 by ASME

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