Title :
Auger electron spectroscopy (AES) study on fractured rapidly-quenched and sintered NdFeB magnets
Author :
Li, L. ; Graham, C.D., Jr.
Author_Institution :
Dept. of Mater. Sci. & Eng., Pennsylvania Univ., Philadelphia, PA, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
By using Auger electron spectroscopy (AES) to obtain chemical information from the fractured surfaces of rapidly quenched and sintered NdFeB magnets, it is found that the Nd-rich phases in the grain boundaries are different in these two kinds of magnets. In rapidly quenched NdFeB magnets, the Nd-rich phase is mainly Nd-Fe binary (Nd:Fe 2-3:1) without oxygen. In sintered NdFeB magnets, the Nd-rich phase is mainly Nd-Fe binary (Nd:Fe 2-3:1) without oxygen. In sintered NdFeB magnets, the Nd-rich phase is Nd-Fe-O (Nd:Fe:O 2-3:1:1). There are many Nd oxide particles (Nd:O about 1:1-1.5) of 1 μm in diameter in the sintered NdFeB, but not in the rapidly-quenched samples
Keywords :
Auger effect; boron alloys; ferromagnetic properties of substances; fracture; grain boundaries; iron alloys; neodymium alloys; permanent magnets; rapid solidification; sintering; 1 micron; AES; Auger electron spectroscopy; Nd oxide particles; Nd-rich phases; NdFeB; fractured surfaces; grain boundaries; rapidly quenched magnets; sintered NdFeB magnets; Annealing; Corrosion; Electrons; Grain boundaries; Magnets; Neodymium; Spectroscopy; Stability; Surface cracks; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
