High-temperature thermal fatigue causes the failure of thermal barrier coating (TBC) systems. This paper addresses the development of thick TBCs, focusing on the microstructure and the porosity of the yttria partially stabilized zirconia (YPSZ) coating, regarding its resistance to thermal fatigue. Thick TBCs, with different porosity levels, were produced by means of a CoNiCrAlY bond coat and YPSZ top coat, both had been sprayed by air plasma spray. The thermal fatigue resistance of new TBC systems and the evolution of the coatings before and after thermal cycling was then evaluated. The limit of thermal fatigue resistance increases depending on the amount of porosity in the top coat. Raman analysis shows that the compressive in-plane stress increases in the TBC systems after thermal cycling, nevertheless the increasing rate has a trend which is contrary to the porosity level of top coat.

Thermal Fatigue Behavior of Thick and Porous Thermal Barrier Coatings Systems / A. Scrivani; G. Rizzi; U. Bardi; C. Giolli; M. Muniz-Miranda; S. Ciattini; A. Fossati; F. Borgioli. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - STAMPA. - 16:(2007), pp. 816-821. [10.1007/s11666-007-9128-2]

Thermal Fatigue Behavior of Thick and Porous Thermal Barrier Coatings Systems

BARDI, UGO;MUNIZ-MIRANDA, MAURIZIO;CIATTINI, SAMUELE;BORGIOLI, FRANCESCA
2007

Abstract

High-temperature thermal fatigue causes the failure of thermal barrier coating (TBC) systems. This paper addresses the development of thick TBCs, focusing on the microstructure and the porosity of the yttria partially stabilized zirconia (YPSZ) coating, regarding its resistance to thermal fatigue. Thick TBCs, with different porosity levels, were produced by means of a CoNiCrAlY bond coat and YPSZ top coat, both had been sprayed by air plasma spray. The thermal fatigue resistance of new TBC systems and the evolution of the coatings before and after thermal cycling was then evaluated. The limit of thermal fatigue resistance increases depending on the amount of porosity in the top coat. Raman analysis shows that the compressive in-plane stress increases in the TBC systems after thermal cycling, nevertheless the increasing rate has a trend which is contrary to the porosity level of top coat.
2007
16
816
821
A. Scrivani; G. Rizzi; U. Bardi; C. Giolli; M. Muniz-Miranda; S. Ciattini; A. Fossati; F. Borgioli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/316320
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