Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: INNOMAG e.V. Diplom-/Master Prize 2019
MA 17.1: Vortrag
Dienstag, 2. April 2019, 11:30–11:50, H48
Annealing methods for rapidly quenched ribbons using exothermic self-heating — •Findan Block1, Jeffrey McCord1, and Mie Marsilius2 — 1CAU Kiel, Institute for Materials Science, Nanoscale Magnetic Materials-Magnetic Domains, Kaiserstr. 2, 24143 Kiel, Germany — 2Vacuumschmelze GmbH & Co. KG, Grüner Weg 37, 63450 Hanau, Germany
Since their development 30 years ago nanocrystalline ribbon wounded cores are used in electronic devices due to their superior soft magnetic properties. These are essentially influenced by parameters like the heating and cooling rate, during the transformation from an amorphous into a nanocrystalline material. Here, the development of a fast annealing process for ribbon wounded cores is introduced, which delivers comparable magnetic properties for the cores as for ribbons treated by the continuous annealing method. Cores out of Fe75.7Cu0.8Nb1.5B6.5Si15.5 are brought in contact to a sheathed thermocouple, so that the exothermic effect during the crystal formation is observable. This is irrelevant for normal ribbon annealing, but leads to a rise of over 100 ∘C in the larger cores. By exploiting this effect and using short times and high heating rates it was possible to achieve smaller coercivity and magnetostriction in comparison with ribbon samples annealed under similar conditions, what enables faster production and the usage of a broader spectrum of alloys. In addition the structure parameters grain size and crystalline volume fraction could be linked to the magnetic property gradients inside the core, which are neglectable for the best combination of annealing parameters.