Method of preparing anisotropic neodymium-iron-boron multi-pole magnetic ring

Abstract

A method of preparing an anisotropic neodymium-iron-boron multi-pole magnetic ring comprises the following steps: (a) taking a number of types of anisotropic neodymium-iron-boron magnetic powder withdifferent particle sizes, sub-packaging and marking the magnetic powder, and mixing the magnetic powder to form mixed magnetic powder; (b) modifying the surface of the mixed magnetic powder by a silane coupling agent; (c) adding a binder to the surface-modified magnetic powder for vacuum mixing, and mixing the magnetic powder with paraffin wax; (d) pre-pressing the magnetic powder after mixing toform a preformed blank; (e) performing pulse multi-pole magnetic field orientation multiple times on the preformed blank in an orientation molding pressing mold to form multiple poles of a magnetic ring, and pressing the poles to form a magnetic ring; (f) demagnetizing the formed magnetic ring in the mold and removing the magnetic ring from the mold to obtain an anisotropic neodymium-iron-boron multi-pole magnetic ring blank; and (g) curing the neodymium-iron-boron multi-pole magnetic ring blank under the protection of inert gas in a vacuum curing furnace, and immersing the neodymium-iron-boron multi-pole magnetic ring blank in oil to obtain a finished anisotropic neodymium-iron-boron multi-pole magnetic ring.

Description

【Technical field】 [0001] The invention relates to a method for preparing a magnet, in particular to a method for preparing an anisotropic NdFeB multipole magnetic ring. 【Background technique】 [0002] Anisotropic bonded NdFeB is a new type of permanent magnet material developed in recent years. Compared with sintered NdFeB materials, although its maximum magnetic energy product is 30-50% lower, it has a high material utilization rate. , High dimensional accuracy, short manufacturing cycle, easy processing and other advantages, so it has developed rapidly in recent years. However, the preparation of anisotropic bonded NdFeB magnets is far more difficult than that of isotropic bonded NdFeB magnets. The difficulty lies in the design of the orientation magnetic field and the compression molding under the magnetic field orientation. [0003] At present, the development and industrialization of anisotropic bonded NdFeB multi-pole magnets have complex molding process, many influen...

AI Technical Summary

Problems solved by technology

However, the preparation of anisotropic bonded NdFeB magnets is far more difficult than isotropic bonded NdFeB magnets. The difficulty lies in the design of the orientation magnetic field and the compression molding under the magnetic field orientation.

[0003] At present, the development and industrialization of anisotropic bonded NdFeB multi-pole magnets have complex molding process, many influencing factors, uneven density distribution of the prepared magnets, poor orientation, and long production cycles in the orientation compaction process and demagnetization process. , low efficiency and poor magnet appearance coating etc.