Phase evolution, magnetic properties, and coercivity mechanism of melt-spun Pr2Fe14(C,B)/alpha-Fe-type ribbons

摘要

High-performance Pr2Fe14(C, B)/alpha-Fe-type nanocomposites have been prepared by a melt spinning technique. The phase transformations, magnetic properties, and coercivity mechanism of Pr11-xDyFe72+xCo10C4B2 (x = 0-3) ribbons have been investigated. All ribbons are comprised of the 2:14:1, 2:17, alpha-Fe phases and a small amount of 1:2 paramagnetic rare-earth carbides. The volume fraction of the alpha-Fe phase increases with increasing x, which leads to a fast decrease of coercivity of the ribbons. Intergranular exchange coupling effect is pronounced at low x (x less than or equal to 2), and diminishes with further increase in x. Consequently, the B-r of the ribbons exhibits the same trend. A sample with the optimum values of B-r = 9.4 kG, H-i(c) = 10. 8 kOe and (BH)(max) = 16 MGOe, respectively, has been obtained in Pr10DyFe73Co10C4B2 (i.e. x = 1) ribbons. Moreover, it has been found that the magnetization reversal of Pr2Fe14(C, B)/alpha-Fe-type nanocomposites varies with the increase of x. (C) 2003 Elsevier B.V. All rights reserved. [References: 22]