Thermophysical Behavior of Thermal Sprayed Yttria Stabilized Zirconia Based Composite Coatings
Thermophysical Behavior of Thermal Sprayed Yttria Stabilized Zirconia Based Composite Coatings
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DOI：
10.1016/j.ceramint.2017.05.170
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发表时间：
2017-10
影响因子：
5.2
通讯作者：
Subhasisa Nath;I. Manna;A. Jha;S. C. Sharma;S. K. Pratihar;J. Majumdar
中科院分区：
文献类型：
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作者：
Subhasisa Nath;I. Manna;A. Jha;S. C. Sharma;S. K. Pratihar;J. Majumdar
复合涂层的有效导热率取决于组成相的固有导热率、其特性（尺寸、形状）和孔隙体积分数。本研究主要研究CoNiCrAlY和Al2O3含量对采用热喷涂沉积技术开发的YSZ（YSZ-CoNiCrAlY和YSZ-Al2O3）基复合涂层的热膨胀系数和导热系数的影响。复合涂层的热膨胀系数和导热系数分别通过推杆膨胀计和激光闪光技术在室温至 1000 °C 范围内进行测量。在YSZ-CoNiCrAlY和YSZ-Al2O3复合材料中分别添加不同体积分数的CoNiCrAlY和Al2O3粉末，观察到复合涂层密度、孔隙率、热膨胀系数和导热系数的变化。理论热导率与实验热导率的比较表明，YSZ-CoNiCrAlY 复合涂层的失配范围为 4% 至 58%，YSZ-Al2O3 复合涂层的失配范围为 58% 至 80%。基于模型的分析用于了解复合涂层导热系数降低的机制。结论是，孔隙的形态随成分的变化而变化。
The effective thermal conductivity of a composite coating depends on intrinsic thermal conductivity of the constituent phases, its characteristics (size, shape) and volume fraction of porosities. The present study concerns studying the effect of CoNiCrAlY and Al2O3content on the coefficient of thermal expansion and thermal conductivity of the YSZ (YSZ-CoNiCrAlY and YSZ-Al2O3) based composite coatings developed by thermal spray deposition technique. The coefficient of thermal expansion and thermal conductivity of the composite coatings were measured by push rod dilatometer and laser flash techniques, respectively, from room temperature to 1000 °C. Variation in density, porosity, coefficient of thermal expansion, and thermal conductivity was observed in the composite coatings with the addition of different volume fraction of CoNiCrAlY and Al2O3powders in YSZ-CoNiCrAlY and YSZ-Al2O3composites, respectively. Comparison between the theoretical and experimental thermal conductivities showed a mismatch varying from 4% to 58% for YSZ-CoNiCrAlY composite coatings and from 58% to 80% for YSZ-Al2O3composite coatings. Model based analyses were used to understand the mechanism of thermal conductivity reduction in the composite coatings. It was concluded that the morphology of porosities varied with composition.