Title :
Modified Sm2Fe17Ny permanent magnets
Author :
Wendhausen, P.A.P. ; Hu, Bo-Ping ; Handstein, A. ; Eckert, D. ; Pitschke, W. ; Muller, K.-H.
Author_Institution :
Inst. fuer Festkorper- und Werkstofforschung Dresden, Germany
fDate :
11/1/1993 12:00:00 AM
Abstract :
The substitution of elements M (M=Nb, V, Ti, Co) for Fe in Sm2Fe17Ny is investigated regarding its structural and magnetic properties. Zn-bonding as well as milling of Sm 2(Fe1-xMx)17Ny is studied as a means of improving the properties of their corresponding permanent magnets. Co-substitution improves the temperature dependence of remanence while V-containing magnets show a better shape of the demagnetization curve. Additional milling of nitrides enhances the coercivity, due to pinning of domain walls or to single domain particle behavior. Zn bonding of very fine Sm2Fe17Ny powders, followed by heat treatment, e.g., 425 °C for 100 min, leads to an overall decrease of the permanent-magnet properties caused by the formation of α-Fe
Keywords :
cobalt alloys; coercive force; demagnetisation; ferromagnetic properties of substances; heat treatment; iron alloys; magnetic domain walls; magnetic properties of fine particles; niobium alloys; permanent magnets; precipitation; remanence; samarium alloys; titanium alloys; vanadium alloys; α-Fe; 100 mins; 425 degC; Sm2(FeCo)17Nx; Sm2(FeNb)17Nx; Sm2(FeTi)17Nx; Sm2(FeV)17Nx; Sm2Fe17Ny permanent magnets; Zn-bonding; coercivity; demagnetization curve; heat treatment; magnetic properties; milling; nitrides; permanent magnets; remanence; single domain particle behavior; temperature dependence; Coercive force; Demagnetization; Iron; Magnetic properties; Milling; Permanent magnets; Remanence; Shape; Temperature dependence; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
