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| Abstract No.: |
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Scheduled at:
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Thursday, May 05, 2022, Hall D 11:20 AM
Industrial Gas Turbines
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| Title: |
The pitfalls of thermal property evaluation of thermal barrier coatings – what can go wrong
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| Authors: |
Nicholas Curry* / Thermal Spray Innovations, Austria
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| Abstract: |
During the research and development of high temperature coatings, evaluation of thermal properties, such as thermal conductivity, are critical to their functional evaluation. Furthermore, tracking the change in thermal properties with thermal exposure is important for the understanding of their long-term performance.
Evaluation of coating thermal properties has been a part of research work since the inception of thermal barrier coatings in the 1980’s. While it has been published on in various forms over the years; often the specific technical and practical aspects of the test procedure and evaluation are not discussed. As such there are many traps or pitfalls for researchers to fall into.
The aim of this paper is to cover the main aspects of evaluating thermal properties of ceramic and metallic coatings utilised in high temperature coatings. Specifically: methods to measure specific heat capacity, density, thermal diffusivity, and the evaluation of thermal conductivity. The practical challenges of these methods will be discussed as well as the impact of long-term thermal exposure on these coatings.
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