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Heat exchangers made of polymer-bonded La(Fe,Si)13

Skokov, K. P. and Karpenkov, D. Yu. and Kuz'min, M. D. and Radulov, I. A. and Gottschall, T. and Kaeswurm, B. and Fries, M. and Gutfleisch, O. (2014):
Heat exchangers made of polymer-bonded La(Fe,Si)13.
In: Journal of Applied Physics, AIP Publishing LLC, pp. 17A941, 115, (17), ISSN 0021-8979,
[Online-Edition: http://dx.doi.org/10.1063/1.4868707],
[Article]

Abstract

We report on magnetocaloric properties of polymer-bonded La(Fe,Si)13 heat exchangers with respect to the grain size of the powder used and the pressure applied for compaction of plates. Quite remarkably, it was found that the values of the adiabatic temperature change of polymer-bonded plates are 10% higher than in the initial bulk material. A critical value of the pressure applied during the compaction was found. Exceeding this value leads to a drastic reduction of the magnetocaloric effect due to cracking and comminution of the initial 50–100 μm grains down to 1–10 μm fragments. Compacting the LaFe11.6Si1.4 powder with 5 wt. % of silver epoxy under an optimal pressure of 0.1 GPa resulted in the production of 0.6 mm-thick plates. These plates were subsequently stacked and glued together into a simple porous heat exchanger with straight 0.6 mm-width channels.

Item Type: Article
Erschienen: 2014
Creators: Skokov, K. P. and Karpenkov, D. Yu. and Kuz'min, M. D. and Radulov, I. A. and Gottschall, T. and Kaeswurm, B. and Fries, M. and Gutfleisch, O.
Title: Heat exchangers made of polymer-bonded La(Fe,Si)13
Language: English
Abstract:

We report on magnetocaloric properties of polymer-bonded La(Fe,Si)13 heat exchangers with respect to the grain size of the powder used and the pressure applied for compaction of plates. Quite remarkably, it was found that the values of the adiabatic temperature change of polymer-bonded plates are 10% higher than in the initial bulk material. A critical value of the pressure applied during the compaction was found. Exceeding this value leads to a drastic reduction of the magnetocaloric effect due to cracking and comminution of the initial 50–100 μm grains down to 1–10 μm fragments. Compacting the LaFe11.6Si1.4 powder with 5 wt. % of silver epoxy under an optimal pressure of 0.1 GPa resulted in the production of 0.6 mm-thick plates. These plates were subsequently stacked and glued together into a simple porous heat exchanger with straight 0.6 mm-width channels.

Journal or Publication Title: Journal of Applied Physics
Volume: 115
Number: 17
Publisher: AIP Publishing LLC
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 31 Mar 2014 07:37
Official URL: http://dx.doi.org/10.1063/1.4868707
Identification Number: doi:10.1063/1.4868707
Funders: The research leading to these results has been partially funded by from the European Community's 7th Framework Program under the grant agreement No. 310748 (DRREAM). , We also gratefully acknowledge financial support from the German Federal Ministry of Education and Research under the VIP Project No. 03V0540 (MagKal).
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