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Coating defect evaluation based on stimulated thermography
Author(s): Davide Palumbo; Rosanna Tamborrino; Umberto Galietti
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Paper Abstract

Thermal Barrier Coatings are used to protect the materials from severe temperature and chemical environments. In particular, these materials are used in the engineering fields where high temperatures, corrosive environments and high mechanical stress are required. Defects present between substrate material and coating, as detachments may cause the break of coating and the consequent possibility to exposure the substrate material to the environment conditions. The capability to detect the defect zones with non-destructive techniques could allow the maintenance of coated components with great advantages in terms of costs and prediction of fatigue life.

In this work, two different heat sources and two different thermographic techniques have been used to detect the adhesion defects among the base material and the coating. Moreover, an empirical thermographic method has been developed to evaluate the thickness of the thermal coating and to discriminate between an unevenness of the thickness and a defect zone. The study has been conducted on circular steel specimens with simulated adhesion defect and on specimens prepared with different thicknesses of thermal barrier coating.

Paper Details

Date Published: 5 May 2017
PDF: 15 pages
Proc. SPIE 10214, Thermosense: Thermal Infrared Applications XXXIX, 102140X (5 May 2017); doi: 10.1117/12.2267851
Show Author Affiliations
Davide Palumbo, Politecnico di Bari (Italy)
Rosanna Tamborrino, Politecnico di Bari (Italy)
Umberto Galietti, Politecnico di Bari (Italy)


Published in SPIE Proceedings Vol. 10214:
Thermosense: Thermal Infrared Applications XXXIX
Paolo Bison; Douglas Burleigh, Editor(s)

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