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Magnetic properties of Pr‐Fe‐Co‐V‐W‐Si‐B system exchange spring magnets
Author(s) -
Yamamoto Hiroshi,
Nakanishi Takashi
Publication year - 2006
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20211
Subject(s) - materials science , alloy , analytical chemistry (journal) , quenching (fluorescence) , metallurgy , chemistry , physics , quantum mechanics , chromatography , fluorescence
Abstract The melt‐spun ribbons of Pr‐Fe‐Co‐V‐W‐Si‐B system alloys were prepared by single roller rapid‐quenching method. The effects of composition, surface velocity, and heat treatment on the magnetic properties were investigated. The P 9 sFe 71 Co 8 V 0.5 W 0.5 Si 0.5 B 10.5 alloy ribbons prepared at a surface velocity of 12.5 m/s were crystallized by heat treatment, and the optimum heat‐treatment condition was found to be at 575°C for 3 min, for which the magnetic properties were ( BH ) max = 136.1 kJ/m 3 , J r = 0.93 T, H cJ = 652.2 kA/m, and H cB = 528.3 kA/m. The temperature coefficients of J r and H cJ for the ribbons crystallized from melt‐spun ribbons of Pr 9 Fe 71 Co 8 V 0.5 W 0.5 Si 0.5 B 10.5 alloy were α( J r ) ave = −0.057%/°C and α( H cJ ) = −0.450%/°C. The value of ( B ) max for the compression molding Pr 9 Fe 71 Co 8 V 0.5 W 0.5 Si 0.5 B 10.5 isotropic bonded magnet prepared by using the ribbons annealed at 575°C for 3 min is 80.0 kJ/m 3 , and the density is 6.24 Mg/m 3 . © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(3): 10–16, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20211 Copyright © 2006 Wiley Periodicals, Inc.