Influence of creep and cyclic oxidation in thermal barrier coatings
Influence of creep and cyclic oxidation in thermal barrier coatings
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DOI：
10.3139/146.110629
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发表时间：
2012-01
影响因子：
0.8
通讯作者：
P. Seiler;M. Bäker;J. Rösler
中科院分区：
文献类型：
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作者：
P. Seiler;M. Bäker;J. Rösler
摘要热障涂层系统的寿命受到界面附近裂纹的限制，从而导致分层。为了研究失效机理，分析了一个简化的模型系统，该系统由粘结涂层块体材料、热生长的氧化物和氧化钇稳定的氧化锆面涂层组成。模型系统中的应力采用有限元模型进行计算，该模型涵盖了全热循环、各层蠕变和居住过程中各向异性氧化的模拟。氧化物和热障涂层中的蠕变随使用不同的蠕变参数设置而变化。采用快速蠕变铁合金和缓慢蠕变氧化物弥散强化MA956两种不同的粘结涂层材料，分析了蠕变对粘结层的影响。结果表明，粘结层中的蠕变影响涂层的使用寿命。此外，快速爬行的热生长氧化物有利于涂层系统的使用寿命。
Abstract The lifetime of thermal barrier coating systems is limited by cracks close to the interfaces, causing delamination. To study the failure mechanisms, a simplified model system is analysed which consists of a bond-coat bulk material, a thermally grown oxide, and an yttria-stabilised zirconia topcoat. The stresses in the model system are calculated using a finite element model which covers the simulation of full thermal cycles, creep in all layers, and the anisotropic oxidation during dwelling. Creep in the oxide and the thermal barrier coating is varied with the use of different creep parameter sets. The influence of creep in the bondcoat is analysed by using two different bond-coat materials: fast creeping Fecralloy and slow creeping oxide dispersion strengthened MA956. It is shown that creep in the bondcoat influences the lifetime of the coatings. Furthermore, a fast creeping thermally grown oxide benefits the lifetime of the coating system.