Effect of vacuum heat treatment on thermal cycling life of APS-NiCoCrAlY+APS-YSZ thermal barrier coating

doi:10.13251/j.issn.0254-6051.2020.12.009

Abstract

Abstract: NiCoCrAlY+YSZ Coatings were deposited on HA188 alloy by using air plasma spray technique, some of which were subsequently heat treated at 1080 ℃ under low and high vacuum respectively. The 1100 ℃ thermal cycling tests were carried out on as-sprayed and heat-treated specimens, the microstructure and composition of specimens were studied before and after thermal cycling test by using SEM with EDS. The results show that after the vacuum heat treatment, the thermal cycling life is significantly improved, which thanks to continuous TGO layer growth between APS-NiCoCrAlY/APS-YSZ interface inhibited during thermal cycling, therefore, the cracking tensile stress induced by TGO is reduced. In addition, more oxides are found in vacuum heat treated APS-NiCoCrAlY after thermal cycling test, to some extent, which reduces the thermal expansion coefficient of APS-NiCoCrAlY, leading to reduction of cracking strain originated from thermal expansion mismatch. The failure cracks in low vacuum heat treated specimens don't continuously propagate as that in high vacuum heat treatment.

Key words: vacuum heat treatment, thermal barrier coating, thermal cycling life

CLC Number:

TG174.44

Xue Wenli, Lu Tao, Huang Jiahua, Guo Deliang. Effect of vacuum heat treatment on thermal cycling life of APS-NiCoCrAlY+APS-YSZ thermal barrier coating[J]. Heat Treatment of Metals, 2020, 45(12): 47-52.

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