Funct. Mater. 2013; 20 (2): 203-207.

Hard-magnetic melt-spun R–Fe–B alloys on the base of light rare-earth metals (R=La, Nd)

O.M.Bovda[1], V.O.Bovda[1], L.V.Onischenko[1], O.S.Tortika[1], O.O.Kostin[1], A.G.Ravlik[2], B.A.Avramenko[2], A.S.Aseev[2], V.M.Baumer[3]

[1]National Scientific Centre "Kharkiv Institute of Physics and Technology", 1 Akademicheskay Str., 61108 Kharkiv, Ukraine
[2]NTU "KhPI", 21 Frunze Str., 61002 Kharkiv, Ukraine
[3]SSI ISC, 60 Lenin Ave., 61178 Kharkiv, Ukraine


Effects of La addition on microstructure and magnetic properties of LaxNd33–xFe65.9B1.1 (wt. %) melt-spun ribbons and isotropic bonded magnets were systematically studied. X-ray diffraction and DSC data revealed that addition of La led to the formation of highly refined and inhomogeneous La-rich phase. It was shown that the average grain size and volume fraction of the main magnetic (La,Nd)2Fe14B phase depend on La concentration. For better LaxNd33–xFe65.9B1.1x = 2.5 and 5 wt. % bonded samples, the room-temperature magnetic properties of Hci = 1343 kA/m and 1300 kA/m, and Br= 0.61 T and 0.614 T were obtained. Magnetic flux aging loss for alloys with appropriate La content (x = 5–10 wt. %) did not exceed 5 % in the range of 100–125°C, which is typical for conventional ternary Nd–Fe–B melt-spun magnets.


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