Effects of Defects on the Thermal Fatigue Behavior of Detonation-Gun Sprayed Thermal Barrier Coatings
Jin Hong Kim, Moon Chul Kim, Chan Gyung Park
METALS AND MATERIALS International
Abstract
The effects of coating defects, such as pores and cracks, on the thermal fatigue behavior of zirconia based thermal barrier coatings (TBCs) have been investigated. Duplex TBCs, which are composed of an 8 wt.% Y2O3 stabilized ZrO2 (YSZ) layer on top of a NiCrAlY bond layer were produced by detonation gun spraying. Thermal fatigue tests were conducted on three different TBC specimens, the YSZ layers of which were varied in terms of porosity and crack morphology, and failure analyses were subsequen...Moretly carried out on the tested specimens. From these results, the roles of the defects on the thermal and mechanical degradation behavior of the TBCs were investigated.
keywords:Thermal barrier coatings; detonation gun spray technique; coating defects; Thermal fatigue
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