Potenzialità della tecnica EIS per il rilievo del degrado delle barriere termiche sottoposte a prove di ossidazione ciclica

Translated title of the contribution: Potentiality of EIS technique in detecting thermal barriers degradation induced by cyclic oxidation

A. Lapina, M. Bestetti, C. Rinaldi

Research output: Contribution to specialist publicationArticle

Abstract

This work consists in the study of the evolution of the typical coatings of hot parts in gas turbines, consisting in a metallic layer and a ceramic layer (zirconia partially stabilized with ittria), working as thermal barrier. First of all are showed the results of an experimental campaign performed on samples thermally cycled at two different temperatures and then examined with metallographic analysis to find the deterioration mechanisms due to exposure at high temperatures and the action of repeated thermal cycles. Then is considered the possibility of application of a non destructive evaluation technique (the electrochemical impedance spectroscopy) to detect the increasing level of deterioration. The variation of the obtained impedance spectra confirmed that the technique is sensitive to the thickness of the ceramic layer, to its characteristics (porosity and microcracking) and to the formation of the oxide layer at the metal-ceramic interface. The obtained results are discussed in the light of quantitative metallographic analysis and information available in the literature. Some further development lines are suggested.

Original languageItalian
Volume100
No.10
Specialist publicationMetallurgia Italiana
Publication statusPublished - Nov 2008
Externally publishedYes

Fingerprint

Deterioration
degradation
Degradation
Oxidation
Microcracking
oxidation
Cermets
ceramics
Electrochemical impedance spectroscopy
deterioration
Zirconia
Oxides
Gas turbines
Porosity
impedance
Coatings
Temperature
gas turbines
zirconium oxides
quantitative analysis

Keywords

  • Coatings
  • Cyclic oxidation
  • Deterioration
  • Electrochemical impedance spectroscopy
  • Thermal barrier coatings

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Potenzialità della tecnica EIS per il rilievo del degrado delle barriere termiche sottoposte a prove di ossidazione ciclica. / Lapina, A.; Bestetti, M.; Rinaldi, C.

In: Metallurgia Italiana, Vol. 100, No. 10, 11.2008.

Research output: Contribution to specialist publicationArticle

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N2 - This work consists in the study of the evolution of the typical coatings of hot parts in gas turbines, consisting in a metallic layer and a ceramic layer (zirconia partially stabilized with ittria), working as thermal barrier. First of all are showed the results of an experimental campaign performed on samples thermally cycled at two different temperatures and then examined with metallographic analysis to find the deterioration mechanisms due to exposure at high temperatures and the action of repeated thermal cycles. Then is considered the possibility of application of a non destructive evaluation technique (the electrochemical impedance spectroscopy) to detect the increasing level of deterioration. The variation of the obtained impedance spectra confirmed that the technique is sensitive to the thickness of the ceramic layer, to its characteristics (porosity and microcracking) and to the formation of the oxide layer at the metal-ceramic interface. The obtained results are discussed in the light of quantitative metallographic analysis and information available in the literature. Some further development lines are suggested.

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