TITLE

Exchange-spring permanent magnet particles produced by spark-erosion

AUTHOR(S)
Hansen, M. F.; Vecchio, K. S.; Parker, F. T.; Spada, F. E.; Berkowitz, A. E.
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/10/2003, Vol. 82 Issue 10, p1574
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Exchange-spring permanent magnet particles of composition Pr[sub 6.93]Fe[sub 85.7]B[sub 5.95]Nb[sub 1.39] in at. % were prepared by spark-erosion in liquid argon. The best exchange-spring properties were achieved after vacuum annealing the as-sparked powders at 700 °C for ∼5 min, and did not change significantly for anneals up to 120 min. This behavior suggests that the equilibrium dimensions of the "hard" and "soft" phases were determined by the sizes of the spark-eroded particles in which they developed. The Pr[sub 2]Fe[sub 14]B phase developed as spheres, likely single crystals, in an α-Fe+Fe[sub 2]B matrix.
ACCESSION #
9214393

 

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