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Adiabatic temperature change of micro- and nanocrystalline Y2Fe17 heat-exchangers for magnetic cooling

Karpenkov, D. Yu. and Skokov, K. P. and Liu, J. and Karpenkov, A. Yu. and Semenova, E. M. and Airiyan, E. L. and Pastushenkov, Yu. G. and Gutfleisch, O. (2016):
Adiabatic temperature change of micro- and nanocrystalline Y2Fe17 heat-exchangers for magnetic cooling.
In: Journal of Alloys and Compounds, ELSEVIER SCIENCE SA, pp. 40-45, 668, ISSN 09258388, [Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2016.01.209],
[Article]

Abstract

Magnetic refrigerants are used as heat exchangers to provide rapid heat transfer between magnetocaloric materials and heat-transfer liquid. An important question is how to turn bulk magnetocaloric materials into porous structures with superior heat transfer properties and cooling performance. We discuss two methods for assembling Y2Fe17 rapidly quenched ribbons into heat exchangers of desired geometry stacked 100 mm thick plates with 100 mm gaps: the first method consists in gluing rapidly quenched ribbons using thermoconductive epoxy; the second is sintering stacked ribbons at a temperature of 30 K below the melting point of the Y2Fe17 phase. These approaches are promising with regards to making near-net shaped magnetic refrigerants. We report on adiabatic temperature change Delta T-ad, magnetic entropy change Delta S-m and thermal conductivity lambda of rapidly quenched Y2Fe17 ribbons, obtained at different quenching rates. A direct correlation between the lattice parameters of the Y2Fe17, Delta T-ad and Delta S-m in rapidly quenched samples is observed. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2016
Creators: Karpenkov, D. Yu. and Skokov, K. P. and Liu, J. and Karpenkov, A. Yu. and Semenova, E. M. and Airiyan, E. L. and Pastushenkov, Yu. G. and Gutfleisch, O.
Title: Adiabatic temperature change of micro- and nanocrystalline Y2Fe17 heat-exchangers for magnetic cooling
Language: English
Abstract:

Magnetic refrigerants are used as heat exchangers to provide rapid heat transfer between magnetocaloric materials and heat-transfer liquid. An important question is how to turn bulk magnetocaloric materials into porous structures with superior heat transfer properties and cooling performance. We discuss two methods for assembling Y2Fe17 rapidly quenched ribbons into heat exchangers of desired geometry stacked 100 mm thick plates with 100 mm gaps: the first method consists in gluing rapidly quenched ribbons using thermoconductive epoxy; the second is sintering stacked ribbons at a temperature of 30 K below the melting point of the Y2Fe17 phase. These approaches are promising with regards to making near-net shaped magnetic refrigerants. We report on adiabatic temperature change Delta T-ad, magnetic entropy change Delta S-m and thermal conductivity lambda of rapidly quenched Y2Fe17 ribbons, obtained at different quenching rates. A direct correlation between the lattice parameters of the Y2Fe17, Delta T-ad and Delta S-m in rapidly quenched samples is observed. (C) 2016 Elsevier B.V. All rights reserved.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 668
Publisher: ELSEVIER SCIENCE SA
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 11 May 2016 12:47
Official URL: http://dx.doi.org/10.1016/j.jallcom.2016.01.209
Identification Number: doi:10.1016/j.jallcom.2016.01.209
Funders: This work was supported by Russian Scientific Foundation Grant No. 15-12-10008., D. Karpenkov gratefully acknowledge the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST "MISiS" (No K4-2015-013)., D. Karpenkov gratefully acknowledge the financial support of the President of the Russian Federation No 14.Z56.15.3775-MK, RFBR 15-32-70002., K. P. Skokov is grateful to the European Community 7th Framework Program under the grant agreement No. 310748 (DRREAM)., O. Gutfleisch thanks the DFG (SPP1599)., Y. Pastushenkov thanks grant of Ministry of Education and Science of the Russian Federation No 1598.
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