Investigation about Thermal Shock Property of Plasma-Spraying Sm2Zr2O7 Thermal Barrier Coatings with Different Substrate Condictions

Hong Song Zhang; Hong Chan Sun

doi:10.4028/www.scientific.net/AMR.354-355.145

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 354-355Investigation about Thermal Shock Property of...

Investigation about Thermal Shock Property of Plasma-Spraying Sm₂Zr₂O₇ Thermal Barrier Coatings with Different Substrate Condictions

Abstract:

Effect of substrate conditions, including material type, thickness and radius of substrate, on thermal-shocking stresses of plasma spraying Sm₂Zr₂O₇/ NiCrCoAlY TBCs was analyzed through finite element method. Results show that radial stresses decrease with time increasing, and they decrease with the increasing of distance from center to edge along radius. However, axial residual stresses increse abruptly at the edge of specimen. All residual stresses increse with incresing of thermal expansion coefficient of substrate. Radial stresses increase with substrate thickness increasing, however, they are not effectd by substrate thickness if it is great than 20mm.and axial residual stresses and shear stresses are not effected by the substrate thickness. The maximum values of axial stresses and shear stresses were not effected by sustrate radius. and values of radial stresses remian invariable when substrate radius is over 18mm.