Temperature Estimation and Al Content Prediction Focusing on Microstructural Change in a Thermal Barrier Coating
Temperature Estimation and Al Content Prediction Focusing on Microstructural Change in a Thermal Barrier Coating
复制标题
关注热障涂层微观结构变化的温度估算和铝含量预测
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Kitamura
中科院分区：
文献类型：
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作者：
M. Okada;T. Hisamatsu;T. Kitamura
将一种具有模拟燃气轮机叶片的热障涂层(TBC)的高温合金暴露在高温环境中，以开发一种预测粘结层(BC)中局部温度和Al含量的方法。Al含量随着测试时间的延长而降低，这是由于BC的氧化和BC与衬底之间的互扩散引起的Al的迁移。这在BC和顶层之间的边界处产生了减铝层(ADL)。ADL的厚度与测试时间的平方根成正比，生长速率的温度依赖于Arrhenius类型的行为。根据这一关系，在运行时间已知的情况下，可以通过测量叶片的ADL厚度来估计在役叶片的局部温度。Al含量与ADL厚度成正比。并给出了基于该关系的铝含量预测方法。
A superalloy with a thermal barrier coating (TBC) simulating a gas turbine blade is exposed to a high-temperature environment to develop a method for predicting the local temperature and Al content in a bond coat (BC). The Al content decreases with an increase in the test time due to the Al transport induced by the oxidation of the BC and the interdiffusion between the BC and the substrate. This brings about Al-decreased layer (ADL) at the boundary between the BC and the top coat. The thickness of the ADL increases in proportion to the square root of the test time, and the temperature dependence of the growth rate shows an Arrhenius-type behavior. Based on this relation, the local temperature of an in-service blade can be estimated by measuring the ADL thickness when the operation time is known. The Al content decreases in proportion to the ADL thickness. The prediction method of the Al content based on the relation is also presented.