LAUSR

Abstract Double ceramic layer thermal barrier coatings (DCL-TBCs) of LaMgAl11O19/YSZ (LMA/YSZ) were prepared by atmospheric plasma spraying (APS). Composition, microstructure and phase stability of coatings were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and differential scanning calorimetry (DSC). The amorphous phase content of LMA coating increased with increasing the plasma gun current from 350 A to 650 A. The DCL-TBCs of LMA/YSZ whose LMA coating was prepared with a plasma gun current of 600 A (600LMA/YSZ) had the lower amorphous phase content, an excellent thermal insulation performance and the longest thermal cycling lifetime, indicating that properties of LMA coating could be largely improved by adjusting the APS conditions.