Internal Stress Distribution in Suspension Plasma Sprayed Thermal Barrier Coating Subjected to in-plane Tensile Loading
Internal Stress Distribution in Suspension Plasma Sprayed Thermal Barrier Coating Subjected to in-plane Tensile Loading
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面内拉伸载荷下悬浮液等离子喷涂热障涂层的内应力分布
DOI：
10.11330/jtss.60.3
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
中村 唯我
中科院分区：
文献类型：
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作者：
山崎 泰広;篠宮 啓介;奥村 忠晴;鈴木 賢治;菖蒲 敬久;中村 唯我
热障涂层（TBC）对于高效燃气轮机联合循环的涡轮叶片至关重要。典型的TBC系统由高温合金基体上具有耐高温腐蚀性的金属结合层（BC）和采用空气等离子喷涂（APS）工艺的陶瓷面涂层（TC）组成。最近，悬浮等离子喷涂 (SPS) 工艺通过使用亚微米尺寸的精细喷涂颗粒和溶剂作为悬浮液，实现了比 APS 更精细的微观结构控制。据报道，采用SPS方法喷涂的柱状结构TBC具有优异的抗热疲劳性能。然而，关于SPS-TBC中内应力分布的信息很少。在这项研究中，通过高能同步加速器X射线和低能X射线衍射分析评估了柱状结构SPS-TBC在拉伸载荷作用下的内应力分布。实验结果表明，由于SPS-TBC柱状结构的应力松弛机制，SPS-TBC的内应力低于传统的APS-TBC。 SPS-TBC 在面外方向表现出周期性残余应力减小。还使用柱结构模型进行了有限元分析。通过实验与分析结果的对比，讨论了微观结构对SPS-TBC内应力分布的影响。
Thermal barrier coatings (TBCs) are essential for the turbine blades of high-efficiency gas turbine combined cycles. A typical TBC system consists of a metal bond coat (BC) with high-temperature corrosion resistance on a superalloy substrate and a ceramic top coat (TC) using the air plasma spraying (APS) process. Recently, the suspension plasma spraying (SPS) process enabled finer microstructural control than the APS one by using fine spray particles of sub-micron size with a solvent as a suspension. It has been reported that the TBC with a columnar structure sprayed by using the SPS method has superior thermal fatigue resistance. However, there is little information about internal stress distribution in the SPS-TBC. In this study, the internal stress distribution of the SPS-TBC with a columnar structure subjected to tensile loading was evaluated by the high-energy synchrotron X-ray and the low-energy X-ray diffraction analysis. Experimental results revealed that the internal stress in the SPS-TBC was lower than the conventional APS-TBC due to the stress relaxation mechanism of the SPS-TBC's columnar structure. The SPS-TBC exhibited a periodic residual stress reduction in the out-of-plane direction. The finite elemental analysis was also conducted using the column structure models. Based on the comparison between the experimental and analysis results, the effect of microstructure on the internal stress distribution of the SPS-TBC was discussed.