Nondestructive measurement of porosity in thermal barrier coatings

Porosity is an integral part of thermal barrier coatings (TBC) and is required to provide thermal insulation and to accommodate operational thermal stresses. The effective use of TBC in hot-section components of aircraft engines requires nondestructive testing (NDT) methods to detect porosity variat...

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Bibliographic Details
Published in:Journal of thermal spray technology 2003-12, Vol.12 (4), p.530-535
Main Authors: ROGE, B, FAHR, A, GIGUERE, J. S. R, MCRAE, K. I
Format: Article
Language:English
Subjects:
Aircraft components
Capacitance
Coating
Cross-disciplinary physics: materials science
rheology
Eddy current testing
Exact sciences and technology
Materials science
Materials testing
Nondestructive testing
Nondestructive testing: electromagnetic testing, eddy-current testing
Physics
Porosity
Risk
Risk reduction
Thermal barrier coatings
Thermal insulation
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Summary:Porosity is an integral part of thermal barrier coatings (TBC) and is required to provide thermal insulation and to accommodate operational thermal stresses. The effective use of TBC in hot-section components of aircraft engines requires nondestructive testing (NDT) methods to detect porosity variations and measure thickness changes to reduce the risk of damage to the coating due to such variations. The eddy current method has been used to measure the thickness of a plasma-sprayed TBC coating and either ultrasonic or capacitance techniques have been applied to assess porosity content based on thickness values obtained using the eddy current tests. The porosity values estimated by the NDT methods have been confirmed by destructive testing, which included metallography and vacuum volumetric measurement using nitrogen absorption.[PUBLICATION ABSTRACT]
ISSN:1059-9630
1544-1016
DOI:10.1361/105996303772082279