Service lifetime and thermal insulation performance are both crucial for the application of thermal barrier coatings (TBCs). In this study, layered structure design under equivalent thermal insulation conception is introduced to lower the cracking driving force in TBCs, and with the goal of prolonging TBCs lifetime. Three groups of layered LZO/YSZ TBCs were designed with same thermal insulation of 500 μm YSZ, the LZO layers were deliberately designed with different initial elastic modulus. Virtual crack closure technique (VCCT) calculation result showed that the energy release rates at the crack tips are 28.2, 22, and 18.8 N/m corresponding to the initial elastic modulus of 70, 60, and 50 GPa. After gradient thermal cyclic tests with surface temperature of 1300 °C, TBCs with lowest initial elastic modulus showed the longest lifetime, and more than double of pure YSZ TBCs. This study provides a new option for the improvement of TBCs lifetime.

使用寿命和隔热性能对于隔热涂层（TBC）的应用都是至关重要的。在这项研究中，引入了等效保温概念下的分层结构设计，以降低TBC的破裂驱动力，并以延长TBC的寿命为目标。设计了三组分层的LZO / YSZ TBC，它们具有相同的500μmYSZ绝热，故意设计了具有不同初始弹性模量的LZO层。虚拟裂纹闭合技术（VCCT）的计算结果表明，裂纹尖端的能量释放速率分别为28.2、22和18.8 N / m，对应于初始弹性模量70、60和50 GPa。经过表面温度为1300°C的梯度热循环试验，初始弹性模量最低的TBC的寿命最长，是纯YSZ TBC的两倍以上。该研究为改善TBC的寿命提供了新的选择。