Relationship between the mechanical properties and structure of a suspension plasma-sprayed thermal barrier coating with columnar microstructure
Relationship between the mechanical properties and structure of a suspension plasma-sprayed thermal barrier coating with columnar microstructure
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DOI：
10.1016/j.surfcoat.2022.128430
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发表时间：
2022-04
影响因子：
5.4
通讯作者：
Y. Yamazaki;M. Morikawa;Tatsuya Hamaguchi;Y. Habu;Yuhei Ohide;Kai Takagi
中科院分区：
文献类型：
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作者：
Y. Yamazaki;M. Morikawa;Tatsuya Hamaguchi;Y. Habu;Yuhei Ohide;Kai Takagi
为了研究具有独特花菜状柱状结构的悬浮等离子喷涂（SPS）热障涂层（TBC）的力学性能，对其亚毫米大小的单柱进行了剪切和悬臂弯曲试验。在剪切试验中，单柱断裂主要发生在涂层/粘结层界面附近的多孔层。与具有片层结构的传统大气等离子喷涂（APS） TBC相比，悬臂弯曲试验表明，SPS TBC沿面外方向的杨氏模量显著降低，弹性模量具有较强的各向异性。单柱的抗剪强度和面外杨氏模量因热老化烧结而增大；抗剪强度的增加比杨氏模量的增加要大。实验和有限元分析结果表明，SPS TBC的力学性能及其随热老化的变化主要受烧结单柱内多孔层的力学性能影响。此外，实验结果表明，具有花椰菜状柱状结构的SPS tbc与APS tbc相比具有更好的热循环耐久性。
To investigate the mechanical properties of a suspension plasma-sprayed (SPS) thermal barrier coating (TBC) with a unique cauliflower-like columnar structure, shear and cantilever bending tests were conducted on its single submillimeter-sized columns. In the shear test, the fracture of the single columns occurred at the porous layer near the top-coating/bond-coating interface. Compared with conventional atmospheric plasma-sprayed (APS) TBCs having a lamellar microstructure, the cantilever bending test revealed a significantly low Young's modulus along the out-of-plane direction and strong anisotropy in the elastic modulus of the SPS TBC. The shear strength and out-of-plane Young's modulus of the single columns increased due to the sintering resulting from thermal aging; however, the increasing ratio of the shear strength was higher than that of the Young's modulus. Both experimental and finite element analysis results indicated that the mechanical properties of the SPS TBC, as well as their variation with thermal aging, are dominated by those of the porous layer within the single column undergoing sintering. Moreover, the experimental results suggested that SPS TBCs having a cauliflower-like columnar microstructure have superior durability to thermal cycles compared with APS TBCs.