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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.19: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Adiabatic T-change and thermal relaxation of magnetocaloric core-shell wires — •Alexander Funk¹, Tino Gottschall², Lukas Beyer¹, Anja Waske³, and Maria Krautz¹ — ¹IFW Dresden, Germany — ²HZDR Dresden, Germany — ³BAM Berlin, Germany

Conventional magnetocaloric materials (MCMs) generate or release heat when magnetized or demagnetized. This effect can be utilized in a cooling device. Although materials and prototypes have been investigated deeply for the last two decades [1], the shaping of the MCMs into complex heat exchanger geometries (HEG) is still challenging.

One possibility to overcome shaping difficulties is to combine MCMs to composites with a 2nd binder phase, e.g. polymers or ductile metals [2]. The composite’s shape is commonly limited to plates, however recently magnetocaloric core-shell wires, based on a La(Fe,Co,Si)₁₃-core and a steel-shell, were presented [3]. Such wires are versatile semi-finished products, which can be assembled to different HEG [4].

In this work, the adiabatic T-change of the core and the shell were assessed by pulse-field measurements in 2T, 5T and 10T. By monitoring the temperature change on both components simultaneously, the thermal transfer between core and shell is investigated. The thermal relaxation of the wire was also investigated via optical infrared microscopy and FEM-simulation.

[1] Franco et al., Progress in Materials Science 93, 2018. [2] Radulov et al., Acta Materialia, 2017. [3] Funk et al., Materials Today Energy 9, 2018. [4] Trevizoli et al., Applied Energy 187, 2017.