Measurements of thermal conductivities of alumina powders and Min-K in vacuum
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Thermal conductivities of two types of alumina powders, having average particle sizes of 1.0 μm and 0.1 μm effective porosities of 91.4% and 96.2%, respectively, and of Min-K insulation materials were measured in vacuum. The thermal conductivities of all three increased with temperature, but at varying slopes. The developed thermal conductivity correlations were within ±10% and ±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's in the perpendicular direction, respectively.
Proceedings of the Intersociety Energy Conversion Engineering Conference
author list (cited authors)
Huang, L., El-Genk, M. S., & Schuller, M. J.
complete list of authors
Huang, L||El-Genk, MS||Schuller, MJ