308 TGO内の残留応力に及ぼすボンドコート溶射方法の影響(OS3-2 薄膜・コーティング材の機械的特性と界面強度特性)

概要

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The purpose of this study was to understand the effect of spraying method of bond coat on residual stress in thermally grown oxide (TGO) of thermal barrier coating (TBC) systems. The TBC systems used as testing specimens consists of 8wt% yttria stabilized zirconia (ZrO_2-8wt%Y_2O_3) top coat by atmospheric plasma spraying and NiCoCrAlY alloy bond coat by vacuum plasma spraying (VPS) and high velocity oxy-fuel spraying (HVOF) on a nickel based superalloy (MarM247). The local stress distributions in the TGO layer were measured by photo-stimulated luminescence spectrum. Although the thickness of the TGO of VPS material is higher than that of HVOF material, their residual stresses in the TGO layer are not much different. Based on cracks in top coat and TGO morphology, the effect of spraying method of bond coat on residual stress in TGO is discussed.
2010-10-09