Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Functional Materials II - Oxides and Alloys
MM 9.1: Vortrag
Montag, 31. März 2014, 11:45–12:00, IFW A
Magnetic characterization and 3D-imaging of epoxy-based magnetocaloric composites — •Bruno Weise1, Barbara Pulko2, Konstantin Skokov3, Jaka Tušek2, Oliver Gutfleisch3, Anja Waske1, and Jürgen Eckert1,4 — 1IFW Dresden, Institute for Complex Materials, Dresden, Germany — 2University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia — 3TU Darmstadt, Department of Materials Science, Darmstadt, Germany — 4Institute of Materials Science, Dresden University of Technology, Dresden, Germany
Epoxy-based magnetocaloric composites of La-Co-Fe-Si with different fractions of active material were produced and characterized. Their magnetic properties, as well as the temperature- and field-dependent specific heat capacity (cp) were determined. For comparison, a sintered La-Co-Fe-Si and a Gadolinium sample, which is a benchmark material for magnetocaloric materials, was measured. From the specific heat, entropy change Δ S and temperature change, Δ T was calculated and compared with magnetic measurements (Δ SM) and direct measurements (Δ Tdirect). Furthermore by using Computed Tomography (CT) exact volume fractions of the active magnetocaloric material, the epoxy and the porosity were studied. We will discuss the magnitude of the magnetocaloric effect with respect to the active magnetic material and the role of the porosity.