Ultrasonic technique for measuring porosity of plasma-sprayed alumina coatings

S. Parthasarathi, Bernhard R. Tittmann, E. J. Onesto

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Porosity is an important factor in plasma-sprayed coatings, especially ceramic coatings. Excessive porosity can adversely affect the performance of the coated component in various ways. An ultrasonic nondestructive 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 technique, 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 generate 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.

Original languageEnglish (US)
Pages (from-to)486-488
Number of pages3
JournalJournal of Thermal Spray Technology
Volume6
Issue number4
DOIs
StatePublished - Jan 1 1997

Fingerprint

Aluminum Oxide
Alumina
aluminum oxides
Porosity
ultrasonics
Ultrasonics
porosity
Plasmas
coatings
Coatings
ceramic coatings
Ceramic coatings
Ultrasonic velocity
sprayed coatings
Sprayed coatings
sprayers
frequency ranges
Calibration
low frequencies
Fabrication

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Parthasarathi, S. ; Tittmann, Bernhard R. ; Onesto, E. J. / Ultrasonic technique for measuring porosity of plasma-sprayed alumina coatings. In: Journal of Thermal Spray Technology. 1997 ; Vol. 6, No. 4. pp. 486-488.
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Ultrasonic technique for measuring porosity of plasma-sprayed alumina coatings. / Parthasarathi, S.; Tittmann, Bernhard R.; Onesto, E. J.

In: Journal of Thermal Spray Technology, Vol. 6, No. 4, 01.01.1997, p. 486-488.

Research output: Contribution to journalArticle

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