Effect of Substrate Conditions on Residual Stress of Plasma-Spraying Sm₂Zr₂O₇ Thermal Barrier Coatings

Abstract:

Effect of substrate conditions, including material type, thickness and radius of substrate, on residual thermal stresses of plasma spraying Sm₂Zr₂O₇ TBCs was analyzed though finite element method in this paper. The radial and shear stresses of Sm₂Zr₂O₇ decrease with increasing of distance from the center to edge along radius of specimen, and they decrease abruptly at the edge of the specimen, while the axial residal stress increase abruptly at the edge of substrate. All residual stresses increase with increasing of thermal expansion coefficient of substrate. The thickness of substrate has slight effect on the radial residual stress, and axial residual stress and shear stress are almost uneffected by thickness of substrate. The optimum thickness of substrate is 10mm. Radius of substrate have no effect on radial stress when it is greater than 28mm, and radius of substrate has no effect on axial stress and shear stress of Sm₂Zr₂O₇ TBCs.

• Periodical: Applied Mechanics and Materials (Volumes 84-85)
• Pages: 548-551
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.84-85.548
• Online since: August 2011
• Authors: Ren Xi Hu, Su Ran Liao, Hong Song Zhang, Yuan Wei
• Keywords: Condition of Substrate, Finite Element Method (FEM), Thermal Barrier Coating (TBC)

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