The analysis showed that it was a pseudo-diffusion interface between the film and the substrate.
界面分析认为，薄膜与基体的界面为伪扩散界面。
2
Diffusion of oxygen in the bonding coating and substrate is mainly grain-boundary diffusion. Grain-boundary diffusion coefficient is far greater than intragrain diffusion.
氧在粘结底层和基体中的扩散是以晶界扩散为主，晶界扩散系数远远大于晶内的扩散系数。
3
However, cracks initialized in the diffusion layer between substrate and bond coat when TBCs were tested with low cycle fatigue at high temperature.