Thermo-Physical Properties and Thermal Shock Resistance of Segmented La₂Ce₂O₇/YSZ Thermal Barrier Coatings

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• 作者：Hongbo Guo (1) guo.hongbo@buaa.edu.cn
  Yi Wang (1) wangyibh@mse.buaa.edu.cn
  Lu Wang (1)
  Shengkai Gong (1)
• 关键词：La2Ce2O7 (LCO) ; segmentation cracks ; thermal barrier coatings (TBCs) ; thermal shock ; thermo ; physical properties
• 刊名：Journal of Thermal Spray Technology
• 出版时间：December 2009
• 出版年：2009
• 期刊代码：26_1544-1016
• 类别：ch
• 卷：18
• 期：4
• 页码：665-671
• 数据来源：sp

摘要

La₂Ce₂O₇ (LCO)/yttria-stabilized zirconia (YSZ) thermal barrier coating (TBC) with segmentation crack structure was produced by atmospheric plasma spraying. Thermo-physical properties, such as thermal diffusivities and thermal conductivities, and thermal cycling performance of the segmented LCO/YSZ TBC were investigated. The thermal conductivity of the segmented coating was measured to be around 1.02 W/mK at 1200 掳C, relatively lower than that of the non-segmented coating, respectively. The segmented LCO/YSZ TBC exhibited a thermal cycling lifetime of around 2100 cycles, improving the durability by nearly 50%as compared to the non-segmented TBC. The failure of the segmented coating occurred by chipping spallation and delamination cracking within the coating.