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Epoxy-bonded La–Fe–Co–Si magnetocaloric plates

Pulko, Barbara and Tušek, Jaka and Moore, James D. and Weise, Bruno and Skokov, Konstantin and Mityashkin, Oleg and Kitanovski, Andrej and Favero, Chiara and Fajfar, Peter and Gutfleisch, Oliver and Waske, Anja and Poredoš, Alojz (2015):
Epoxy-bonded La–Fe–Co–Si magnetocaloric plates.
In: Journal of Magnetism and Magnetic Materials, Elsevier Science Publishing, pp. 65-73, 375, ISSN 03048853, [Online-Edition: http://dx.doi.org/10.1016/j.jmmm.2014.08.074],
[Article]

Abstract

We report the processing, analysis and testing of magnetocaloric composite materials consisting of La–Fe–Co–Si particles of various size fractions and a polymer matrix. All of the composites have working temperatures close to room temperature. The composites were pressed into thin plates, a geometry favorable for testing the composites in an active magnetic regenerator (AMR). In order to investigate the influence of particle size and binder type (epoxy), eight different epoxy-bonded La–Fe–Co–Si plates were made and analyzed. We found that the higher filling factor that can be achieved by using a mixture of several particle size fractions has beneficial influence on the thermal conductivity. Tests in the AMR revealed that a maximum temperature span of approximately ΔT=10 K under magnetic field change of μ0H=1.15 T can be obtained at no cooling load conditions. The stability of the measured ΔT values and the mechanical integrity of sample after cyclic application of a magnetic field have been monitored for 90,000 cycles and showed no significant changes. We therefore conclude that epoxy-bonded La–Fe–Co–Si magnetocaloric composites have good magnetocaloric properties at low material-processing costs and hence represent a competitive way to produce magnetocaloric materials to be used in AMR.

Item Type: Article
Erschienen: 2015
Creators: Pulko, Barbara and Tušek, Jaka and Moore, James D. and Weise, Bruno and Skokov, Konstantin and Mityashkin, Oleg and Kitanovski, Andrej and Favero, Chiara and Fajfar, Peter and Gutfleisch, Oliver and Waske, Anja and Poredoš, Alojz
Title: Epoxy-bonded La–Fe–Co–Si magnetocaloric plates
Language: English
Abstract:

We report the processing, analysis and testing of magnetocaloric composite materials consisting of La–Fe–Co–Si particles of various size fractions and a polymer matrix. All of the composites have working temperatures close to room temperature. The composites were pressed into thin plates, a geometry favorable for testing the composites in an active magnetic regenerator (AMR). In order to investigate the influence of particle size and binder type (epoxy), eight different epoxy-bonded La–Fe–Co–Si plates were made and analyzed. We found that the higher filling factor that can be achieved by using a mixture of several particle size fractions has beneficial influence on the thermal conductivity. Tests in the AMR revealed that a maximum temperature span of approximately ΔT=10 K under magnetic field change of μ0H=1.15 T can be obtained at no cooling load conditions. The stability of the measured ΔT values and the mechanical integrity of sample after cyclic application of a magnetic field have been monitored for 90,000 cycles and showed no significant changes. We therefore conclude that epoxy-bonded La–Fe–Co–Si magnetocaloric composites have good magnetocaloric properties at low material-processing costs and hence represent a competitive way to produce magnetocaloric materials to be used in AMR.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 375
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Magnetocaloric effect, Magnetic refrigeration, La–Fe–Co–Si, Active magnetic regenerator, Epoxy
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: 17 Nov 2014 09:49
Official URL: http://dx.doi.org/10.1016/j.jmmm.2014.08.074
Identification Number: doi:10.1016/j.jmmm.2014.08.074
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