一种热障涂层的形貌和相结构特征研究

Investigation of Morphology and Phase Structure Feature of TBC

研究了一种热障涂层的形貌和相结构组成。溅射NiCrAlY粘结层由γ-N_1相和β-NiAl相组成,是柱状结构,其晶粒度小,属于微晶,有利于形成α-Al_2O_3膜。溅射NiCrAlY粘结层经真空处理后,发生γ和γ′的转变,以及β-NiAl和脱溶。EB-PVD TBC具有开放性的柱状结构,并且存在大量的t′-ZrO_2相,使涂层性能大大优化。

The morphology and phase structure feature of a TBC was investigated. The sputtered NiCrAlYbond coat,which consisted of a two-phase mixture;r phase and p-NiAl phase,had columnar microstructure and very fine grain size,which favored the formation of A12O3 scale. EB-PVD YSZ also had a columnar microstructure, which imparted TBC a good adherence to bond coat. The ceramic coating consisted primarily of tetragonal phase with minor amounts of monoclini, and cubic phases. The t' phase was critical to excellent YSZ thermal barrier performance.