Measurements of thermal conductivities of alumina powders and Min-K in vacuum

Lianmin Huang, Mohamed S. El-Genk, Michael Schuller

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Abstract

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.

Original languageEnglish
Pages (from-to)1190-1195
Number of pages6
JournalProceedings of the Intersociety Energy Conversion Engineering Conference
Volume2
Publication statusPublished - 1997
Externally publishedYes

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ASJC Scopus subject areas

  • Fuel Technology
  • Electrical and Electronic Engineering

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