Highly durable thermal barrier coatings made by the solution precursor plasma spray process
Highly durable thermal barrier coatings made by the solution precursor plasma spray process
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DOI：
10.1016/j.surfcoat.2003.06.023
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发表时间：
2004-01
影响因子：
5.4
通讯作者：
M. Gell;L. Xie;Xinqing Ma;E. Jordan;N. Padture
中科院分区：
文献类型：
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作者：
M. Gell;L. Xie;Xinqing Ma;E. Jordan;N. Padture
溶液前驱体等离子喷涂（SPPS）工艺为制备高耐久性、低热导率的热障涂层（TBCs）提供了前景。在这项研究中，田口设计的实验，以优化SPPS过程。结果表明，在优化工艺条件下，在MCrAlY粘结涂层镍基高温合金基体上制备的SPPS热障涂层的寿命是相同基体和粘结涂层的常规等离子喷涂热障涂层的2.5倍以上。SPPS热障涂层的上级耐久性与其新颖的微观结构有关，这些微观结构包括：（i）含有微米和纳米孔隙率的陶瓷基体，（ii）存在非常细的飞溅（直径为0.5至5 μm），（iii）贯穿厚度的裂纹，以及（iv）改善的陶瓷与粘结涂层的粘附力。SPPS热障涂层的失效发生在陶瓷顶涂层内，靠近陶瓷/粘结涂层界面。屈曲散斑是所有受试样本观察到的失效模式。还证明了SPPS工艺能够沉积厚（>2 mm）且耐用的TBC。
The solution precursor plasma spray (SPPS) process offers the prospect of depositing highly durable thermal barrier coatings (TBCs) of low thermal conductivity. In this study, a Taguchi design of experiments was employed to optimize the SPPS process. The spallation life of SPPS TBCs on a MCrAlY bond coated Ni-base superalloy substrate deposited under the optimized processing conditions was demonstrated to be more than 2.5 times of that of a conventional plasma sprayed TBC with the same substrate and bond coat. The superior durability of SPPS TBCs is associated with their novel microstructures, which include: (i) a ceramic matrix containing micrometer and nanometer porosity, (ii) the presence of very fine splats (0.5 to 5-μm diameters), (iii) through-thickness cracks, and (iv) improved ceramic to bond coat adhesion. The failure of SPPS TBCs occurs within the ceramic top coat, near the ceramic/bond coat interface. Buckling spallation is the failure mode observed for all tested samples. It was also demonstrated that the SPPS process is capable of depositing thick (>2 mm) and durable TBCs.