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MA: Magnetismus

MA 22: Internal Symposium “50 Years AG Magnetism”

MA 22.3: Hauptvortrag

Mittwoch, 29. März 2006, 16:15–16:45, HSZ 03

Industrial Rare-Earth Permanent Magnets and their Applications — •Matthias Katter — Vacuumschmelze GmbH Co. KG, Grüner Weg 37, 63450 Hanau

The production route and the main applications of high end sintered permanent magnets based on Nd-Fe-B and Sm-Co are reviewed. For Nd-Fe-B, the influence of the grain size on the magnetic properties and the corrosion resistance is reported. Commercial Nd-Fe-B magnets meanwhile reach energy densities of up 53 MGOe, whereas for lab magnets about 58 MGOe are obtained which is close to the theoretical limit of 64 MGOe. The magnetization behaviour of Sm2(Co,Fe,Cu,Zr)17 magnets, which is determined by pinning of domain walls, is discussed. Industrial magnet grades of this type can be applied up to 350 - 550^∘C. The main applications for Nd-Fe-B magnets are in hard disc drives and in any kind of motors. A large increase is expected in the next years for automotive applications like steering by wire and hybrid electric vehicles. From the scientific side, there are challenging demands for very homogenous magnets for beam guiding systems like wigglers and undulators.