Phase Stability and Thermal Cycle Life of ZrO₂-Y₂O₃-La₂O₃ Coatings Produced by EB-PVD

Abstract

  Effect of La₂O₃ addition on phase stability and thermal cycle life of Y₂O₃ stabilized ZrO₂ (YSZ) coatings produced by EB-PVD was investigated. The developed coating showed low thermal conductivity even after high temperature exposure due to its high resistance to sintering. However, phase stability and thermal cycle life of the coating decreased as the amount of La₂O₃ was increased. Further experiments were necessary to optimize the amount of stabilizers (Y₂O₃, La₂O₃) in order to develop advanced thermal barrier coatings.