Erosion Performance of Gadolinium Zirconate-Based Thermal Barrier Coatings Processed by Suspension Plasma Spray
Erosion Performance of Gadolinium Zirconate-Based Thermal Barrier Coatings Processed by Suspension Plasma Spray
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DOI：
10.1007/s11666-016-0479-4
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发表时间：
2017-01-01
影响因子：
3.1
通讯作者：
Vassen, Robert
中科院分区：
文献类型：
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作者：
Mahade, Satyapal;Curry, Nicholas;Vassen, Robert
7-8重量百分比氧化钇稳定的氧化锆（YSZ）是燃气轮机行业使用的标准热障涂层（TBC）材料，因为其具有高达1200 A ℃的优异热性能和热机械性能。提高燃气涡轮机效率的需要导致了涡轮机入口气体温度的增加。然而，高于1200 A摄氏度，YSZ具有诸如差的耐烧结性、差的相稳定性和对钙镁铝硅酸盐（CMAS）降解的敏感性的问题。锆酸钆（GZ）由于其低导热性、良好的抗烧结性和抗CMAS侵蚀性而被认为是在高温（> 1200 A ° C）下用于TBC应用的有希望的顶涂层候选物之一。采用悬浮等离子喷涂（SPS）工艺制备了单层8 YSZ、双层GZ/YSZ和三层GZdense/GZ/YSZ热障涂层。通过扫描电子显微镜（SEM）进行微观结构分析。在单层、双层和三层热障涂层中观察到柱状组织。使用XRD（x射线衍射）进行喷涂态TBC的相分析，其中观察到单层YSZ TBC中的氧化锆的四元相和双层和三层TBC中的GZ的立方缺陷萤石相。采用水侵入法和图像分析法对喷涂热障涂层的孔隙率进行了测量。在室温下对喷涂态GZ基多层热障涂层进行了冲蚀磨损试验，并与单层8 YSZ的冲蚀磨损性能进行了比较。结果表明，8 YSZ单层TBC的抗冲蚀性能高于GZ基多层TBC。在多层热障涂层中，三层热障涂层的抗冲蚀性能略优于双层热障涂层。对腐蚀后的热障涂层进行冷镶嵌，并进行扫描电镜分析。
7-8 wt.% Yttria-stabilized zirconia (YSZ) is the standard thermal barrier coating (TBC) material used by the gas turbines industry due to its excellent thermal and thermo-mechanical properties up to 1200 A degrees C. The need for improvement in gas turbine efficiency has led to an increase in the turbine inlet gas temperature. However, above 1200 A degrees C, YSZ has issues such as poor sintering resistance, poor phase stability and susceptibility to calcium magnesium alumino silicates (CMAS) degradation. Gadolinium zirconate (GZ) is considered as one of the promising top coat candidates for TBC applications at high temperatures (> 1200 A degrees C) due to its low thermal conductivity, good sintering resistance and CMAS attack resistance. Single-layer 8YSZ, double-layer GZ/YSZ and triple-layer GZdense/GZ/YSZ TBCs were deposited by suspension plasma spray (SPS) process. Microstructural analysis was carried out by scanning electron microscopy (SEM). A columnar microstructure was observed in the single-, double- and triple-layer TBCs. Phase analysis of the as-sprayed TBCs was carried out using XRD (x-ray diffraction) where a tetragonal prime phase of zirconia in the single-layer YSZ TBC and a cubic defect fluorite phase of GZ in the double and triple-layer TBCs was observed. Porosity measurements of the as-sprayed TBCs were made by water intrusion method and image analysis method. The as-sprayed GZ-based multi-layered TBCs were subjected to erosion test at room temperature, and their erosion resistance was compared with single-layer 8YSZ. It was shown that the erosion resistance of 8YSZ single-layer TBC was higher than GZ-based multi-layered TBCs. Among the multi-layered TBCs, triple-layer TBC was slightly better than double layer in terms of erosion resistance. The eroded TBCs were cold-mounted and analyzed by SEM.