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A Load-Based Depth-Sensing Indentation Technique for Damage Assessment of Thermal Barrier Coatings

[+] Author Affiliations
B. S.-J. Kang, C. Feng, J. M. Tannenbaum

West Virginia University, Morgantown, WV

M. A. Alvin

US DOE National Energy Technology Laboratory, Philadelphia, PA

Paper No. GT2009-59985, pp. 873-883; 11 pages
doi:10.1115/GT2009-59985
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4885-2 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

In this paper, we present a load-based micro-indentation technique for evaluating material mechanical property as well as degradation evaluation and debonding/spallation detection of thermal barrier coating (TBC) materials. Comparing to the current prevailing nano/micro-indentation methods, which require precise measurements of the indentation depth and load, the proposed technique only measures indentation load and the overall indentation displacement (i.e. including load-induced displacement of the loading apparatus). Coupled with a multiple-partial unloading procedure during the indentation process, this technique results in a load-depth sensing indentation system capable of determining Young’s modulus of metals, superalloys, and single crystal matrices, and stiffness of coated material systems with flat, tubular, or curved architectures. This micro-indentation technique can be viewed as a viable non-destructive evaluation (NDE) technique for determining as-manufactured and process-exposed metal, superalloy, single crystal, and TBC-coated material properties. This technique also shows promise for the development of a portable instrument for on-line, in-situ NDE and mechanical properties measurement of structural components.

Copyright © 2009 by ASME

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