Title :
Enhancing Magnetic Properties of Bulk Nanograin Composite Nd-Fe-B/Fe-Co Magnets by Applying Powder Coating Technologies
Author :
Liu, S. ; Higgings, A. ; Shin, E. ; Bauser, S. ; Chen, C.H. ; Lee, D. ; Shen, Y. ; He, Y. ; Huang, M.
Author_Institution :
Univ. of Dayton, Dayton
Abstract :
The magnetic properties bulk nanograin composite Nd-Fe-B/Fe-Co magnets is enhanced reducing the size and improving the distribution of the soft phase throughout the magnet. This was achieved through various coating technologies applied to coat melt-spun micrometer-sized Nd-Fe-B powder particles with thin alpha-Fe or Fe-Co layers. These coating techniques include sputtering, pulsed laser deposition, electroless coating and electrolytic coating. The produced magnets showed significantly improved squareness of demagnetization curves, compared with composite magnets prepared by just blending powders. SEM, TEM and XRD were used to characterize the microstructure and grain alignment of the coated powder particles. Hysteresis graph was used to characterize the room temperature magnetic properties of the composite magnets.
Keywords :
X-ray diffraction; boron alloys; cobalt alloys; composite materials; crystal microstructure; demagnetisation; electrodeposits; ferromagnetic materials; interface magnetism; iron alloys; magnetic hysteresis; neodymium alloys; permanent magnets; pulsed laser deposition; scanning electron microscopy; soft magnetic materials; sputtered coatings; transmission electron microscopy; NdFeB-FeCo; SEM; TEM; XRD; bulk nanograin composite magnets; demagnetization curves; electroless coating; electrolytic coating; grain alignment; hysteresis graph; melt-spun micrometer-sized powder particles; microstructure; pulsed laser deposition; soft phase; sputtering; temperature 293 K to 298 K; Coatings; Demagnetization; Magnetic properties; Magnets; Microstructure; Optical pulses; Powders; Pulsed laser deposition; Sputtering; X-ray scattering;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.374942
