Title :
The source of free iron in zinc-bonded permanent magnets based on Sm2Fe17Nx
Author :
Reinsch, B. ; Stadelmaier, H.H. ; Petzow, G.
Author_Institution :
Max-Planck-Inst. fuer Metallforschung, Inst. fuer Werkstoffwissenschaft, Stuttgart
fDate :
11/1/1993 12:00:00 AM
Abstract :
The principal phase resulting from the reaction of Sm2Fe17 with zinc is a solution of Sm in Γ-Fe-Zn. At the maximum Sm content, this cubic phase with α=0.8984 nm has an approximate composition of (at.%) 5 Sm, 42 Fe, 53 Zn, and has no permanent magnetic moment between 4.2 and 600 K. The phase equilibria of the low-Sm alloys in Sm-Fe-Zn show that isostructural Sm2Fe17 and Sm2Zn17 are not miscible and that, because of the pervasiveness of equilibria with α-Fe, it will be difficult to eliminate α-Fe completely from Zn bonded magnets
Keywords :
ferromagnetic properties of substances; iron alloys; permanent magnets; phase equilibrium; precipitation; samarium alloys; zinc alloys; Γ-Fe-Zn; α-Fe; 4.2 to 600 K; Sm2Fe17; Sm2Fe17Nx; Sm2Fe17Nx-Zn; Zn bonded magnets; Zn reaction; cubic phase; low-Sm alloys; phase equilibria; zinc-bonded permanent magnets; Diffraction; Iron; Isothermal processes; Magnetic analysis; Magnetic moments; Permanent magnets; Reflection; Samarium; Temperature; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
