Effect of real TGO interface topography on interface stress of thermal barrier coatings

doi:10.13251/j.issn.0254-6051.2021.11.041

Abstract

Abstract: Effect of real thermally growth oxide (TGO) interface topography on interface stress of thermal barrier coatings on the surface of first-stage blade of a heavy-duty gas turbine was studied by using finite element analysis software MSC.MARC. The results show that in the top coat (TC) layer at the TC/TGO interface, the tensile stress in normal stress σ₂₂ is located in the trough area, and the compressive stress is located in the peak area; while in the bond coat (BC) layer at the BC/TGO interface, the σ₂₂ stress distribution is opposite to that of the TC layer. The σ₁₂ stress distribution of the BC layer is the same as that of the TC layer, the distribution of shear stress σ₁₂ in the TC layer is that the stress direction on the left side of the trough is negative, and that on the right side is positive. The normal stress σ₂₂ at the peak and trough in the TGO increases with the thickness increase of the TGO; and when the thickness of TGO is constant, with the increase of the amplitude of the BC/TGO interface, the σ₂₂ stress in TGO and BC increases.

Key words: thermal barrier coatings, interface stress, thermally growth oxide (TGO), finite element analysis

CLC Number:

TG174.44

Guo Huimin, Li Bo, Zhang Liqun, Tao Jinglei, Huang Wei, Pei Xiuyuan, Xiao Junfeng, Nan Qing. Effect of real TGO interface topography on interface stress of thermal barrier coatings[J]. Heat Treatment of Metals, 2021, 46(11): 232-235.

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