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MA: Magnetismus

MA 8: Hart- und Weichmagn. Materialien / Legierungen

MA 8.3: Vortrag

Dienstag, 12. März 2002, 14:15–14:30, H10

Progress in high T_c permanent magnets — •O. Gutfleisch¹, A. Yan¹, A. Bollero¹, K.-H. Müller¹, L. Schultz¹, D. Schobinger², and G. Martinek² — ¹IFW Dresden, Institut für Metallische Werkstoffe, Postfach 270116, D-01171 Dresden, Germany — ²Magnequench AG, Hübelacher Str. 15, 5242 Lupfig, Switzerland

This work is part of an European research programme (HITEMAG) and we report on the high temperature magnetic properties of Sm(Co_balFe_vCu_yZr_x)_z sintered magnets. The effects of iron, copper and zirconium in dependence on the z-value have been studied. At room temperature, both, a higher Zr and/or higher Cu content, increases the useful z-range with respect to coercivity. An increase in Sm content leads to the best coercivities at high temperatures (450-550^∘C: µ₀H_c =0.8-0.5 T). Higher zirconium content shifts the maximum coercivity to lower samarium levels. Long term stability of magnetic properties at 500^∘C will be discussed.