Accurate thickness evaluation of thermal barrier coatings using microwave resonator sensor

Thermal barrier coatings (TBC) are frequently employed in aircraft engines and turbine blades for protection against high temperatures. Constant exposure to in-service stresses, however, leads to a variety of anomalies in TBC that could prove to be potentially catastrophic for the assemblies they pr...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2024-10, Vol.147, p.103195, Article 103195
Main Authors: Rahman, Mohammed Saif ur, Mustapha, Ademola A., Abou-Khousa, Mohamed A.
Format: Article
Language:English
Subjects:
Microwaves
Non-destructive testing
Planar probe
Resonant sensor
Thermal barrier coatings
Thickness evaluation
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Summary:Thermal barrier coatings (TBC) are frequently employed in aircraft engines and turbine blades for protection against high temperatures. Constant exposure to in-service stresses, however, leads to a variety of anomalies in TBC that could prove to be potentially catastrophic for the assemblies they protect. This raises the need for inspection using non-destructive techniques (NDT) to ensure the reliability and structural integrity of the coated assemblies. Thickness evaluation of the topcoat of the TBC is paramount to determining structural integrity of the TBC. Microwaves are particularly suited for such applications since they readily penetrate low loss TBC. However, the performance of previous microwave-based TBC thickness evaluation techniques was limited in accuracy to 15 μm. In this paper, accurate thickness evaluation of thermal barrier coating (TBC) is performed using a microwave resonator sensor operating at a relatively low frequency (
ISSN:0963-8695
DOI:10.1016/j.ndteint.2024.103195