Radiation magnetic field sintered rare-earth permanent magnetic tile and its magnetic processing method

Abstract

The present invention relates to one kind of radiative magnetic field sintered RE permanent magnetic tile and its magnetic treating process. The tile has sector cross section and concentric inner and outer arc, and radial magnetic field. The magnetic treating process of formation and magnetization inside magnetic field includes the following steps: adopting anisotropic permanent magnet powder of granularity of 2-6 microns; filling the powder into forming cavity; applying parallel magnetic field of magnetic induction 1.0-2.0 T to form radial magnetic field in the forming mold; applying pressure of 20-100 MPa in the direction perpendicular to the magnetic field and maintaining for 2-60 sec; forming the blank tile; and magnetizing the blank tile in radial magnetic field or parallel magnetic field to produce the RE permanent magnetic tile. The magnetically treated RE permanent magnetic tile has obviously higher magnetic energy utilization rate.

Description

technical field [0001] The invention relates to a permanent magnet tile and a magnetic treatment method thereof, in particular to a radiation magnetic field sintered rare earth permanent magnet tile and a magnetic treatment method thereof. Background technique [0002] At present, rare earth permanent magnet materials such as sintered NdFeB have high magnetic properties, and their permanent magnet materials are used in many fields. The tile-shaped permanent magnet material is mainly used in permanent magnet rotors or stators with rotating bodies such as motors and generators. The existing manufacturing method of sintered NdFeB rare earth permanent magnet tile is to first make a cuboid permanent magnet with parallel magnetic field by powder metallurgy, and then process it into a "magnetic tile" with a fan-shaped cross section by wire cutting and other methods, and then Magnetized under parallel magnetic field. Therefore, its disadvantage is that although the shape is tile-s...

AI Technical Summary

Problems solved by technology

Therefore, its disadvantage is that although the shape is tile-shaped, the magnetic domain arrangement is still parallel, and the magnetic field direction is still parallel after magnetization.

The radiator normal N and the magnetic field H often have an included angle θ (θ = 0 ~ 90°, cosθ = 1 ~ 0), so that the magnetic energy of the permanent magnet material can not get a higher utilization rate

Images