Ultrasonic technique for measuring porosity of plasma-sprayed alumina coatings

Porosity is an important factor in plasma-sprayed coatings, especially ceramic coatings. Excessive poros-ity can adversely affect the performance of the coated component in various ways. An ultrasonic nonde-structive measurement technique has been developed to measure porosity in plasma-sprayed alum...

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Bibliographic Details
Published in:Journal of thermal spray technology 1997-12, Vol.6 (4), p.486-488
Main Authors: PARTHASARATHI, S, TITTMANN, B. R, ONESTO, E. J
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Calibration
Ceramic coatings
Coatings
Density
Exact sciences and technology
Fabrication
Metals. Metallurgy
Nonmetallic coatings
Porosity
Production techniques
Sprayers
Sprays
Surface treatment
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Summary:Porosity is an important factor in plasma-sprayed coatings, especially ceramic coatings. Excessive poros-ity can adversely affect the performance of the coated component in various ways. An ultrasonic nonde-structive measurement technique has been developed to measure porosity in plasma-sprayed alumina coatings. The technique is generic and can be extended to other ceramic coating systems. To test the tech-nique, freestanding alumina coatings with varying levels of porosity were fabricated via plasma spray. Samples with varying porosity, obtained through innovative fabrication techniques, were used to gener-ate a calibration curve. The ultrasonic velocity in the low-frequency range was found to be dependent on the density of freestanding coatings (measured via Archimedian techniques). This dependence is the basis of the development of a technique to measure the density of coatings.[PUBLICATION ABSTRACT]
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-997-0035-3