Nanostructured thermal barrier coatings (TBCs) often exhibit bimodal structure comprised of both nanozones and lamellar zones, and therefore, their sintering behaviour can be different from that of conventional coatings. In this study, changes in the microstructure and properties of nanostructured TBCs were investigated. The results show that their microstructural evolution is highly time-sensitive during long thermal exposure at 1150 °C. In stage I (0–20 h), changes in mechanical properties were significant. The dominant microstructural change was faster healing of flat pores, whereas the macroscopic structure seemed less affected. In stage II (20–500 h), the changes in properties were much slighter and some large macroscopic voids appeared. In brief, the microscopic healing of pores in lamellar zones leads to a significant change in mechanical properties in stage I, whereas sintering of the nanozones leads to macroscopic voids in stage II.

纳米结构热障涂层（TBC）通常表现出由纳米区域和层状区域组成的双峰结构，因此，它们的烧结行为可能与常规涂层不同。在这项研究中，研究了纳米结构TBCs的微观结构和性能的变化。结果表明，在1150°C的长时间热暴露期间，它们的微观结构演变对时间高度敏感。在第一阶段（0-20小时），机械性能发生了显着变化。显着的微观结构变化是扁平孔的愈合更快，而宏观结构似乎受到的影响较小。在第二阶段（20-500小时），性质的变化要小得多，并且会出现一些较大的宏观空隙。简单来说，