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 language | Italian |
|---|---|
| Volume | 100 |
| No. | 10 |
| Specialist publication | Metallurgia Italiana |
| Publication status | Published - Nov 2008 |
| Externally published | Yes |
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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 publication › Article
}
TY - GEN
T1 - Potenzialità della tecnica EIS per il rilievo del degrado delle barriere termiche sottoposte a prove di ossidazione ciclica
AU - Lapina, A.
AU - Bestetti, M.
AU - Rinaldi, C.
PY - 2008/11
Y1 - 2008/11
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.
AB - 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.
KW - Coatings
KW - Cyclic oxidation
KW - Deterioration
KW - Electrochemical impedance spectroscopy
KW - Thermal barrier coatings
UR - http://www.scopus.com/inward/record.url?scp=58849084246&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=58849084246&partnerID=8YFLogxK
M3 - Статья
VL - 100
JO - Metallurgia Italiana
JF - Metallurgia Italiana
SN - 0026-0843
ER -