Title :
Correlation between microstructure and magnetic properties of Nd-Fe-Cr-B magnets
Author_Institution :
Inst. for Mater. Sci. & Eng., Warsaw Univ. of Technol., Poland
fDate :
9/1/1990 12:00:00 AM
Abstract :
Sintered magnets of (Nd16Fe76B8) 1-xCrx and (Nd18Fe74B8 )1-xCrx have been prepared by blending Cr powders of different particle sizes with the master magnet powder before sintering. Cr addition is shown to produce changes in the coercive field strength depending on the amount and particle sizes of the Cr powder. The coercivity increase is caused by pinning of domain walls at small inclusions in the intermediate phase and by improved isolation of the hard magnetic grains. Deterioration of coercivity results from a decrease in the intrinsic properties of Nd2(Fe, Cr)14 B phase and nucleation of domain walls at large FeCr inclusion
Keywords :
boron alloys; chromium alloys; coercive force; crystal microstructure; ferromagnetic properties of substances; iron alloys; magnetic domain walls; neodymium alloys; permanent magnets; (Nd16Fe76B8)1-xCr x; (Nd18Fe74B8)1-xCr x; Nd-Fe-Cr-B; coercive field strength; domain wall pinning; hard magnetic grains; intermediate phase; intrinsic properties; magnetic properties; microstructure; nucleation; particle sizes; sintered magnets; small inclusions; Chromium; Coercive force; Iron; Magnetic domain walls; Magnetic domains; Magnetic properties; Magnets; Microstructure; Neodymium; Powders;
Journal_Title :
Magnetics, IEEE Transactions on
