Abstract
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 LaFe11.4Si1.2Co0.4 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.
Highlights
Magnetocaloric materials and systems have attracted high interest in research due to their potential to provide a more efficient and environmental friendly alternative to conventional compressor-based cooling devices [1]
According to the results of the Energy-dispersive X-ray spectroscopy (EDX) analysis of the Laser Beam Melting (LBM) sample, a certain gray microstructure around the black grains consisting of a small amount of 1:13 phase was found
Samples of the composition LaFe11.4 Si1.2 Co0.4 were produced by Laser Beam Melting from gas atomized powder
Summary
Magnetocaloric materials and systems have attracted high interest in research due to their potential to provide a more efficient and environmental friendly alternative to conventional compressor-based cooling devices [1]. Many magnetocaloric materials have been discovered, which exhibit magnetic field dependence of the structural transition, which generally results in a giant magnetocaloric effect (MCE). The possible applications for this material are very limited due to the high cost and low availability of gadolinium and germanium. The compounds of LaFeSi and MnFePX (X = Ge, Si) as well as Ni-Mn-based Heusler alloys have proven to be promising for a broader application. La(FeSi)13 -based alloys came into focus during the last years, since they show high magnetocaloric effect in a broad temperature range and are at the same time composed of relatively cheap and abundant elements [3].
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