Naoyuki Ishigaki

Aligning Behavior of Magnetically Anisotropic Nd-Fe-B Powder under Compaction in Magnetic Field (2)

Aligning behavior of magnetically anisotropic Nd-Fe-B powder under compaction in magnetic field was studied in order to produce high energy bonded magnets composed of this powder and an epoxy resin binder. It was previously reported that applying a strong magnetic field to the powder before the compaction operation is very effective to make highly oriented bonded magnets. In this study, influence of applying a static magnetic field after charging the pulsed field was investigated with regard to the powder alignment. It was found that the degree of powder orientation is strongly dependent on the duration of the static magnetic field in the compaction process. The static field is thought to maintain the powder arrangement formed by the initial pulsed field.