Title :
Temperature stability of flexible RE magnet-foils
Author :
Rodewald, W. ; Wall, B. ; Fernengel, W. ; Katter, M.
Author_Institution :
Vacuumschmelze GmbH, Hanau, Germany
fDate :
9/1/1999 12:00:00 AM
Abstract :
Isotropic polymer-bonded RE magnet-foils with a width of approximately 30 cm were manufactured by the solvent casting technology. The thickness of the magnet-foils could be varied between 200 and 400 μm. The remanent polarizations amount to 0.27 T for isotropic magnet-foils based on Sm2(Co,Cu,Fe,Zr)17 alloy-powders and to 0.41 T for isotropic magnet-foils made of rapidly solidified Nd-Fe-B alloy-powders. Intrinsic coercivities of approximately 8 kA/cm were achieved. The maximum energy densities range between 13.6 kJ/m3 and 28.8 kJ/m3, respectively. For saturation of the magnet-foils magnetizing field strengths up to 40 kA/cm are required. The temperature coefficients are similar to those of sintered magnets. The long-term temperature stability is mainly determined by the thermal aftereffect. The maximum continuous operating temperatures amount to 100°C for Sm2(Co,Cu,Fe,Zr)17 magnet-foils and to about 80°C for Nd-Fe-B magnet-foils
Keywords :
casting; coercive force; ferromagnetic materials; foils; magnetic aftereffect; permanent magnets; powder metallurgy; rare earth alloys; remanence; thermal stability; 0.27 T; 0.41 T; 200 to 400 mum; 30 cm; 80 to 100 C; Nd-Fe-B; Sm2(Co,Cu,Fe,Zr)17 alloy-powders; Sm2(CoCuFeZr)17; flexible RE magnet-foils; intrinsic coercivities; isotropic polymer-bonded RE magnet-foils; long-term temperature stability; magnetizing field strengths; maximum energy densities; rapidly solidified Nd-Fe-B alloy-powders; remanent polarization; saturation; solvent casting; temperature coefficients; temperature stability; thermal aftereffect; thickness; Casting; Coercive force; Manufacturing; Polarization; Polymers; Samarium alloys; Saturation magnetization; Solvents; Stability; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
