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Novel approach for thermal diffusivity measurements in inert atmosphere using the flash method

 
: Pohlmann, C.; Hutsch, T.; Röntzsch, L.; Weißgärber, T.; Kieback, B.

:

Journal of thermal analysis and calorimetry 114 (2013), Nr.2, S.629-634
ISSN: 1418-2874
ISSN: 1388-6150
Englisch
Zeitschriftenaufsatz
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

Abstract
Determining the thermal conductivity is crucial whenever heat transfer issues are considered which play a major role in many technological applications. However, various materials are sensitive to oxygen or moisture and, therefore, cannot be examined with commonly used equipment under ambient conditions. Here, we present a novel approach which combines the inert requirements of ambient-sensitive specimens with the flash method in which the apparatus, a Netzsch LFA 447 NanoFlash®, is placed under ambient conditions. A new measuring cell with flash-transparent windows was constructed which resembles a gas-tight specimen chamber. This device can be easily adapted to other apparatuses based on the flash method. The thermal conductivities of reference materials in inert and ambient conditions were examined in a temperature range from 25 to 275 °C. In general an excellent agreement was found. Further, the usability of this special sample cell is demonstrated for the investiga tion of the thermal conductivities of two complex hydride systems which are important for solid-state hydrogen storage applications.

: http://publica.fraunhofer.de/dokumente/N-255017.html