Microstructures and Properties of Plasma-Sprayed Segmented Thermal Barrier Coatings
Microstructures and Properties of Plasma-Sprayed Segmented Thermal Barrier Coatings
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DOI：
10.1111/j.1551-2916.2005.00912.x
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发表时间：
2006-04
影响因子：
3.9
通讯作者：
Hongbo Guo;S. Kuroda;H. Murakami
中科院分区：
文献类型：
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作者：
Hongbo Guo;S. Kuroda;H. Murakami
通过喷涂两种类型的 ZrO2-8Y2O3 粉末制备了具有不同分段裂纹密度水平的热障涂层（TBC）。熔融粉碎粉末比空心球 (HOSP) 粉末具有更强的形成分段涂层的能力。与传统喷涂涂层相比，高度分段涂层的孔隙率要低得多，从而损害了热障涂层的隔热性能。 HOSP涂层的微观结构和导热系数对喷涂条件的变化更加敏感。分段裂纹对涂层杨氏模量的降低有很大影响。 1250°C 50 小时热处理对高度分段涂层的机械性能影响很小。
Thermal barrier coatings (TBCs) with different levels of segmentation crack density were produced by spraying two types of ZrO2–8Y2O3 powders. The fused and crushed powder has a greater capability of forming segmented coatings than the hollow sphere (HOSP) one. The highly segmented coatings reveal much lower porosity compared with traditionally sprayed coatings, thereby compromising the property of thermal insulation of TBCs. Microstructure and thermal conductivity of the HOSP coatings are more sensitive to the changes in spray conditions. Segmentation cracks had a strong influence in decreasing Young's modulus of coatings. Fifty hours heat treatment at 1250°C had little effect on the mechanical property of the highly segmented coatings.