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首页> 外文期刊>Journal of Materials Science >An experimental technique to evaluate the effective thermal conductivity of Y2O3 stabilized ZrO2 coatings
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An experimental technique to evaluate the effective thermal conductivity of Y2O3 stabilized ZrO2 coatings

机译:评估Y2O3稳定的ZrO2涂层有效导热系数的实验技术

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An experimental device was set up to determine thermal resistance and conductivity of 8% yttria-stabilized zirconia deposited by plasma spray method on cylindrical specimen. In this experimental setup, coated surface of the sample was exposed to a high temperature environment and inner metal surface was cooled by flowing air, simulating actual gas turbine applications. Overall heat resistance at the outside surface of thermal barrier coating was adopted to assess thermal advantage due to the thermal barrier coating deposited on air-cooled cylindrical specimen. 28% less heat was extracted at 1000 degrees C by applying 1.2 mm thick thermal barrier coating. Temperatures of the outside surface of the coated samples increased with increasing coating thickness with respect to the same furnace temperature since the sample with thicker coating was less thermally conductive and retarded heat transfer. The overall heat resistances of samples between the outside surface of sample and the flowing air inside the sample assembly were estimated. Then, the thermal conductivity of coating could be determined from the difference of overall thermal resistances of two selected samples with varying coating thickness. (c) 2006 Springer Science + Business Media, Inc.
机译:建立了一个实验装置,以测定等离子喷涂法在圆柱试样上沉积的8%氧化钇稳定的氧化锆的热阻和电导率。在该实验装置中,样品的涂层表面暴露于高温环境,金属内表面通过流动空气冷却,从而模拟了实际的燃气轮机应用。采用隔热涂层外表面的整体耐热性来评估由于隔热涂层沉积在风冷圆柱试样上而产生的热优势。通过施加1.2毫米厚的热障涂层,在1000摄氏度下可减少28%的热量。相对于相同的炉温,涂覆的样品的外表面的温度随着涂层厚度的增加而增加,这是因为具有较厚涂层的样品导热性较低并且传热受阻。估算了样品外表面与样品组件内部流动空气之间的样品总耐热性。然后,可以从两个选定的具有变化的涂层厚度的样品的总热阻之差确定涂层的导热率。 (c)2006年Springer Science + Business Media,Inc.

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