Measurements of thermal conductivities of alumina powders and Min-K in vacuum [AMTEC applications]

IECEC-97 Proceedings of the Thirty-Second Intersociety Energy Conversion Engineering Conference (Cat. No.97CH6203) Pub Date : 1997-12-31 DOI:10.1109/IECEC.1997.661937

Lianmin Huang, M. El-Genk, M. Schuller

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引用次数: 7

Abstract

Thermal conductivities of two types of alumina powders, having average particle sizes of 1.0 /spl mu/m and 0.1 /spl mu/m and effective porosities of 91.4% and 96.2%, respectively, and of Min-K AMTEC cell insulation materials were measured in vacuum. The thermal conductivities of all three materials increased with temperature, but at varying slopes. The developed thermal conductivity correlations were within /spl plusmn/10% and /spl plusmn/5% of the data of the alumina powders and the Min-K, respectively. The Min-K thermal conductivity was the lowest and least dependent on temperature, increasing from 0.03 to 0.042 W/mK as the temperature increased from 400 K to 800 K, respectively. Analysis showed that the thermal conductance of the Min-K could be an order of magnitude lower in the axial direction, but as much as 2 to 3 orders of magnitude higher that those of 60 and 240 Molybdenum foils insulation in the perpendicular direction, respectively.

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真空中氧化铝粉末和Min-K热导率的测量[AMTEC应用]

测定了平均粒径为1.0 /spl mu/m和0.1 /spl mu/m的两种氧化铝粉末和Min-K型AMTEC电池绝热材料的真空导热系数，分别为91.4%和96.2%。三种材料的导热系数随温度的升高而增加，但斜率不同。氧化铝粉和Min-K的热导率相关性分别在/spl plusmn/10%和/spl plusmn/5%以内。Min-K导热系数最低，对温度的依赖性最小，随温度从400 K增加到800 K，分别从0.03 W/mK增加到0.042 W/mK。分析表明，在轴向上，Min-K的热导率比60和240钼箔的热导率分别低一个数量级，而在垂直方向上，Min-K的热导率分别比60和240钼箔高2 ~ 3个数量级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IECEC-97 Proceedings of the Thirty-Second Intersociety Energy Conversion Engineering Conference (Cat. No.97CH6203)

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