Speaker
Description
Hard magnetic materials are essential for various applications, including green energy technologies such as renewable energy systems and electromobility. Additive manufacturing has emerged as a promising method for fabricating hard magnetic materials, offering design flexibility and scalability. While most research has concentrated on rare-earth-based NdFeB magnets, few studies have also investigated rare-earth-free magnetic materials, ranging from well-established ferrites and AlNiCo to more recent, emerging alternatives.
This study investigates the fabrication of the rare-earth-free magnetic α-MnBi phase via laser powder bed fusion using elemental Mn and Bi powder mixtures. The work focuses on optimizing laser powder bed fusion process parameters to enhance α-MnBi phase formation, refine the microstructure, and improve the magnetic performance of these rare-earth-free magnetic materials. The influence of process parameters on the resulting microstructure was analyzed using scanning electron microscopy and correlated with magnetic properties. Magnetic measurements, performed using a vibrating sample magnetometer at both room and elevated temperatures, revealed a unique positive temperature coefficient of coercivity in the MnBi samples with coercivity increasing at higher temperatures. Additionally, mechanical properties, particularly microhardness, were assessed to evaluate the effects of process optimization on overall material performance. By directly synthesizing the magnetic α-MnBi phase through additive manufacturing, this work establishes a novel pathway for processing rare-earth-free bulk magnetic materials.
| Speaker Country | Austria |
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| Would you like to publish your paper in the special issue of BHM "Berg- und Hüttenmännische Monatshefte" | No |