ZrO2/莫来石热障涂层热冲击性能计算机模拟

Computer simulation of thermal-shocking property for ZrO2/mullite thermal barrier coatings

为确定ZrO2/莫来石热障涂层的单层最佳厚度,采用有限元技术研究单层厚度对ZrO2/莫来石热障涂层热冲击应力的影响。结果表明,莫来石层厚度为0.25 mm时,涂层表面及ZrO2/莫来石界面处具有最大热应力,而其他厚度时涂层内部热应力受莫来石层厚度影响不明显。当ZrO2层厚度为0.3 mm时,ZrO2/莫来石涂层中的热应力在整个横向距离范围内保持稳定,而其他情况下涂层中的热应力则与ZrO2层厚度成正比。涂层表面处的径向热应力大于ZrO2/莫来石界面处的对应值。

In order to select the appropriate thickness of single layer for ZrO 2-mullite thermal barrier coatings,the influence of thickness of single-layer on thermal-shocking property for ZrO 2/mullite thermal barrier coatings was studied by finite-element technology.Results exhibit that there is the most thermal-stress in coatings when the thickness of mullite-layer is about 0.25 mm,and thermal stress in ZrO 2/mullite thermal barrier coatings is not affected by mullite-layer thickness for other cases.The thermal-stress remains stable in the scope of entire radial-distance when ZrO 2-thickness is about 0.3 mm,and thermal stress is proportional to the thickness of ZrO 2-layer for other ZrO 2-layer thickness.The thermal stresses on surface-layer are greater than those of ZrO 2/mullite interface.