Heat Treatment and Formation of Magnetocaloric 1:13 Phase in LaFe 11.4 Si 1.2 Co 0.4 Processed by Laser Beam Melting

In recent years, magnetocaloric materials have been extensively studied as materials for use in alternative cooling systems. Shaping the magnetocaloric material to thin-walled heat exchanger structures is an important step to achieve efficient magnetocaloric cooling systems. In the present work, exp...

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Bibliographic Details
Published inMaterials Vol. 13; no. 3
Main Authors Kagathara, Jwalant, Wieland, Sandra, Gärtner, Eric, Uhlenwinkel, Volker, Steinbacher, Matthias
Format Journal Article
LanguageEnglish
Published Switzerland 07.02.2020
Subjects
laser beam melting
magnetocaloric properties
LaFeSiCoalloys
magnetocaloric materials
heat treatment
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Summary:In recent years, magnetocaloric materials have been extensively studied as materials for use in alternative cooling systems. Shaping the magnetocaloric material to thin-walled heat exchanger structures is an important step to achieve efficient magnetocaloric cooling systems. In the present work, experimental investigations were carried out on the heat treatment of LaFe Si Co alloy processed by Laser Beam Melting (LBM) technology. Due to the rapid solidification after melting, LBM results in a refined micro structure, which requires much shorter heat treatment to achieve a high percentage of magnetocaloric 1:13 phase compared to conventional cast material. The influence of the heat treatment parameters (temperature, time, and cooling rate) on the resulting microstructure has been extensively studied. In addition to the conventional heat treatment process, induction technology was investigated and the results were very promising in terms of achieving good magnetocaloric properties after short-time annealing. After only 15 min holding time at 1373 K, the magnetic entropy change (∆S) of -7.9 J/kg/K (0-2 T) was achieved.
ISSN:1996-1944
1996-1944