Thermal barrier coatings (TBCs) are used to reduce the actual working temperature of the high pressure turbine blade metal surface. Knowing the temperature of the surface of the TBC and at the interface between the bondcoat and the thermally grown oxide (TGO) under realistic conditions is highly desirable. As the major life-controlling factors for TBC systems are thermally activated, therefore linked with temperature, this would provide useful data for a better understanding of these phenomena and to assess the remaining lifetime of the TBC. This knowledge could also enable the design of advanced cooling strategies in the most efficient way using minimum amount of air. The integration of an on-line temperature detection system would enable the full potential of TBCs to be realized due to improved precision in temperature measurement and early warning of degradation. This, in turn, will increase fuel efficiency and reduce emissions. The concept of a thermal-sensing TBC was first introduced by Choy, Feist, and Heyes (1998, “Thermal Barrier Coating With Thermoluminescent Indicator Material Embedded Therein,” U.S. Patent U.S. 6974641 (B1)). The TBC is locally modified so it acts as a thermographic phosphor. Phosphors are an innovative way of remotely measuring temperatures and also other physical properties at different depths in the coating using photo stimulated phosphorescence (Allison and Gillies, 1997, “Remote Thermometry With Thermographic Phosphors: Instrumentation and Applications,” Rev. Sci. Instrum., 68(7), pp. 2615–2650). In this study the temperature dependence of several rare earth doped EB-PVD coatings will be compared. Details of the measurements, the influence of aging, the composition, and the fabrication of the sensing TBC will be discussed in this paper. The coatings proved to be stable and have shown excellent luminescence properties. Temperature detection at ultrahigh temperatures above is presented using new types of EB-PVD TBC ceramic compositions. Multilayer sensing TBCs will be presented, which enable the detection of temperatures below and on the surface of the TBC simultaneously.
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e-mail: r.steenbakker.2003@cranfield.ac.uk
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July 2009
Research Papers
Sensor Thermal Barrier Coatings: Remote In Situ Condition Monitoring of EB-PVD Coatings at Elevated Temperatures
Rémy J. L. Steenbakker,
Rémy J. L. Steenbakker
National High Temperature Surface Engineering Centre,
e-mail: r.steenbakker.2003@cranfield.ac.uk
Cranfield University
, Bedfordshire MK43 0AL, UK
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Jörg P. Feist,
Jörg P. Feist
Southside Thermal Sciences (STS) Ltd., c/o Imperial Innovations, Level 12, Electrical Engineering,
e-mail: j.feist@stscience.com
Imperial College London
, London SW7 2AZ, UK
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Richard G. Wellman,
Richard G. Wellman
National High Temperature Surface Engineering Centre,
Cranfield University
, Bedfordshire MK43 0AL, UK
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John R. Nicholls
John R. Nicholls
National High Temperature Surface Engineering Centre,
Cranfield University
, Bedfordshire MK43 0AL, UK
Search for other works by this author on:
Rémy J. L. Steenbakker
National High Temperature Surface Engineering Centre,
Cranfield University
, Bedfordshire MK43 0AL, UKe-mail: r.steenbakker.2003@cranfield.ac.uk
Jörg P. Feist
Southside Thermal Sciences (STS) Ltd., c/o Imperial Innovations, Level 12, Electrical Engineering,
Imperial College London
, London SW7 2AZ, UKe-mail: j.feist@stscience.com
Richard G. Wellman
National High Temperature Surface Engineering Centre,
Cranfield University
, Bedfordshire MK43 0AL, UK
John R. Nicholls
National High Temperature Surface Engineering Centre,
Cranfield University
, Bedfordshire MK43 0AL, UK
J. Eng. Gas Turbines Power. Jul 2009, 131(4): 041301 (9 pages)
Published Online: April 10, 2009
Article history
Revised:
April 9, 2008
Received:
April 9, 2008
Published:
April 10, 2009
Citation
Steenbakker, R. J. L., Feist, J. P., Wellman, R. G., and Nicholls, J. R. (April 10, 2009). "Sensor Thermal Barrier Coatings: Remote In Situ Condition Monitoring of EB-PVD Coatings at Elevated Temperatures." ASME. J. Eng. Gas Turbines Power. July 2009; 131(4): 041301. https://doi.org/10.1115/1.3077662
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