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Determination of thermal conductivity of powders in different atmospheres by differential scanning calorimetry

We have developed a new method to measure the thermal conductivity of powders by differential scanning calorimetry (DSC) that works with masses in amounts as low as tens of mg. The method is based on that used by Camirand to determine the thermal conductivity of materials in the form of thin sheets but introducing a hemispherical pan to contain powders in such a way that the issue of heat transfer is reduced to a one-dimensional problem. The modification of the method was successfully validated on obtaining identical results in determining the thermal conductivity of a commercial silicone with both Camirand"s method and the modified method. We have also tested our method with materials that, in bulk, cover a wide range of thermal conductivities and have performed the experiments with several atmospheres and reference metals. The results are consistent with already published general trends in that they confirm that thermal conductivity of powders is mainly governed by thermal conduction through the surrounding gas

This work was partially funded by the Spanish Programa Nacional de Materiales through projects MAT2011-28874-C02-02 and by the Generalitat de Catalunya contract No. 2009SGR-185

© Journal of Thermal Analysis and Calorimetry, 2015, vol. 121, núm. 1, p. 469-473

Springer Verlag

Autor: Sánchez-Rodríguez, Daniel
López-Olmedo, Joan Pere
Farjas Silva, Jordi
Roura Grabulosa, Pere
Data: 2015
Resum: We have developed a new method to measure the thermal conductivity of powders by differential scanning calorimetry (DSC) that works with masses in amounts as low as tens of mg. The method is based on that used by Camirand to determine the thermal conductivity of materials in the form of thin sheets but introducing a hemispherical pan to contain powders in such a way that the issue of heat transfer is reduced to a one-dimensional problem. The modification of the method was successfully validated on obtaining identical results in determining the thermal conductivity of a commercial silicone with both Camirand"s method and the modified method. We have also tested our method with materials that, in bulk, cover a wide range of thermal conductivities and have performed the experiments with several atmospheres and reference metals. The results are consistent with already published general trends in that they confirm that thermal conductivity of powders is mainly governed by thermal conduction through the surrounding gas
This work was partially funded by the Spanish Programa Nacional de Materiales through projects MAT2011-28874-C02-02 and by the Generalitat de Catalunya contract No. 2009SGR-185
Format: application/pdf
ISSN: 1388-6150 (versió paper)
1588-2926 (versió electrònica)
Accés al document: http://hdl.handle.net/10256/10587
Llenguatge: eng
Editor: Springer Verlag
Col·lecció: MICINN/PN 2012-2014/MAT2011-28874-C02-02
AGAUR/2009-2013/2009 SGR-185
Versió postprint del document publicat a: http://dx.doi.org/10.1007/s10973-015-4429-z
Articles publicats (D-F)
És part de: © Journal of Thermal Analysis and Calorimetry, 2015, vol. 121, núm. 1, p. 469-473
Drets: Tots els drets reservats
Matèria: Calorimetria
Calorimetry
Calorimetría
Títol: Determination of thermal conductivity of powders in different atmospheres by differential scanning calorimetry
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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