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MA: Fachverband Magnetismus

MA 59: Posters Magnetism III

MA 59.50: Poster

Freitag, 20. März 2020, 09:00–12:00, P2/EG

Influence of the rapid cooling parameters in an adapted melt spinning process on microstructure and magnetic properties of Nd-Fe-B strip cast alloys — •Franziska Staab, Corinna Müller, Stefan Riegg, and Oliver Gutfleisch — TU Darmstadt, Materialwissenschaft, Alarich-Weiß-Str. 16, 64287, Darmstadt, Germany

High-performance Nd-Fe-B magnets are a main component of the power train in e-mobility. The production of the magnets is based on a powder metallurgical route, for which in the first step strip cast (SC) flakes are produced. The rapid cooling during the SC process results in a microstructure which essentially determines the quality of subsequent production steps such as hydrogen decrepitation, jet milling as well as sintering. A control of the microstructure evolution leads to enhanced magnetic properties of the final magnets. Since the minimum amount of material processed with SC is in the range of 20-50 kg and thus very costly, we investigate the influence of different cooling conditions and additional alloying elements on the microstructure with an own modified setup in a melt-spinner. A typical industrial relevant alloy composition of (Nd,Pr,Dy,Tb)14,6Fe77,9(Co,Cu,Al,Ga)1,7B5,8 was used to study the influence of the processing parameters before further elements were added. Scanning electron microscopy reveals a similar microstructure of the melt spun ribbons compared to the strip cast flakes. A detailed characterization and discussion of microstructure and magnetic properties are presented.