Magnetic Properties and Crystal Orientation of Extruded Nd-Fe-B Magnets

Kojima, Kazuki; Ibata, A.; Kojima, Satoshi

doi:10.1109/tjmj.1989.4564224

Cited by 6 publications

(1 citation statement)

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“…Initially, disk-shaped die-upsetting magnets were only fabricated for basic research purposes. In 1988, Kojima et al reported the first ring-shaped hot-deformed magnet designed to be mounted on motors [22]. They used backward extrusion to fabricate the ringshaped magnet and forward extrusion to fabricate the column-shaped magnet.…”

Section: Efforts For Manufacturing Commercial Productsmentioning

confidence: 99%

Development of High-Performance Hot-Deformed Neodymium–Iron–Boron Magnets without Heavy Rare-Earth Elements

Hioki

2023

Materials

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Neodymium–iron–boron magnet is an essential material for the traction motors of green vehicles because it exhibits the highest maximum energy product, (BH)max, out of all permanent-magnet materials. However, heavy rare-earth elements such as dysprosium and terbium, which are scarce resources, are added to these magnets to improve their heat resistance. To address this resource problem, considerable efforts have been made to reduce the composition of heavy rare-earth elements in these magnets without causing a significant reduction in coercivity. Hot-deformed Nd-Fe-B magnets are a category of Nd-Fe-B magnets where precious materials such as heavy rare-earth elements can be eliminated or reduced to maintain high coercivity owing to their fine microstructure. Although they are not often used for the fabrication of high-performance magnets due to their complicated production process and the difficulty in controlling their fine microstructure, after the rare-earth crisis in 2020, these magnets have begun to attract attention as a material that could increase coercivity when controlling their microstructures. This paper provides an overview of hot-deformed magnets and the efforts made to improve their properties by controlling their microstructures.

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Section: Efforts For Manufacturing Commercial Productsmentioning

confidence: 99%