Title :
Microstructure control in HDDR process for higher anisotropic Nd-Fe-B magnet powders
Author :
Kuwano, N. ; Itakura, M. ; Tomokiyo, Y. ; Nakayama, K. ; Morimoto, K.
Author_Institution :
Kyushu Univ., Fukuoka, Japan
Abstract :
Homogenized Nd-Fe-Co-B-Zr(-Ga) alloys are treated by hydrogenation (HD-process) and dehydrogenation (DR-process) with various treatment conditions, followed by quenching in argon gas flow. After the HDDR process, the specimens are crashed into powders. The magnetic properties of the powder and bonded magnets are measured with a vibrating sample magnetometer and a B-H tracer. The microstructural changes are also analyzed by electron microscopy (FE-SEM and TEM) and discussed with special reference to the behavior of boron.
Keywords :
boron alloys; cobalt alloys; coercive force; gallium alloys; grain size; hydrogenation; iron alloys; magnetic particles; magnetometers; neodymium alloys; permanent magnets; quenching (thermal); remanence; scanning electron microscopy; transmission electron microscopy; zirconium alloys; B-H tracer; HDDR process; NdFeCoBZrGa; anisotropic magnet powders; argon gas flow; dehydrogenation; electron microscopy; homogenized alloys; hydrogenation; microstructural changes; microstructure control; quenching; vibrating sample magnetometer; Anisotropic magnetoresistance; Argon; Computer crashes; Fluid flow; Magnetic anisotropy; Magnetic properties; Microstructure; Perpendicular magnetic anisotropy; Powders; Process control;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463600
