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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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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cited_by cdi_FETCH-LOGICAL-c362t-f9248e2586cbc6ecfe13d609f9fdc258cb9df4b88e20b1d8b4a167dc7c6f24443
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description 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]
doi_str_mv 10.1007/s11666-997-0035-3
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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
title Ultrasonic technique for measuring porosity of plasma-sprayed alumina coatings
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