热障涂层残余应力的拉曼光谱测量及数值分析

Abstract

Abstract: Residual stress of thermal barrier coatings (TBCs) is investigated by experiment and numerical method. Thermal barrier coatings, which consist of CoCrAlY bond coating (BC) and ZrO₂ thermat ceramic coating (TCC) are fabricated on the GH99 superalloy by air plasma spray (APS). Meanwhile, residual stress in TBCs during the cooling process is measured by 100-3 500 cm^-1 Raman spectroscopy and simulated using finite element method (FEM). The distributions of vertical stresses are analyzed; meanwhile, the results of Raman shift and numerical simulation are compared. The results show that in the vertical direction, there appears compressive stress in TCC, and to the interface of TCC/BC there shows the maximum compressive stress, 14.8 MPa. There appears tensile stress in BC. The results of the simulation are consistent with experimental measurements obtained with micro-Raman spectroscopy.

Key words: thermal barrier coatings, Raman spectroscopy, Raman shift, finite elment method, residual stress

CLC Number:

HAN Zhiyong, ZHANG Hua, WANG Zhiping. Study of Residual Stress of Thermal Barrier Coatings by Raman Spectroscopy and Numerical Analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(2): 369.

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Study of Residual Stress of Thermal Barrier Coatings by Raman Spectroscopy and Numerical Analysis

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