Study on insulation and stresses of TBCs on a turbine vane under ununiform temperature field

Abstract

Abstract. The paper focuses on insulation and stress of TBCs on a multilayer-coated blade considering ununiform temperature field. First the ununiform temperature field of TBCs was conducted by thermal-flow couple method. Then the thermal cycle residual stresses were modeled by holding the uniform temperature in the dwell step. It is found that the blade benefited more in substrate average temperature than the maximum temperature with top coating (TC) thickening, but the thickness of TC can only slightly affect the temperature fluctuation on TBCs surface. However, thickening TC produced higher normal stresses near the interface around the blade. It suggests that TBCs may suffers delamination near the interface due to residual stresses with TC thickening.