Anisotropic bonded permanent magnet material and method for preparing same

Abstract

The invention provides an anisotropic bonded rare-earth permanent magnet material and a method for preparing the same. The method includes steps of 1), providing SmFeN rare-earth permanent magnet powder materials; 2), carrying out alloying treatment on SmFeN rare-earth permanent magnet powder by the aid of aluminum magnesium alloy; 3), carrying out surface treatment on the SmFeN rare-earth permanent magnet powder by the aid of isobutyltrimethoxysilane; 4), mixing the SmFeN rare-earth permanent magnet powder and composite resin binders with one another to obtain mixtures after the alloying treatment and the surface treatment are carried out on the SmFeN rare-earth permanent magnet powder, and then carrying out mixing on the mixtures in a mixing mill to obtain injection molding raw materials; 5), filling preheated molds with the injection molding raw materials and carrying out injection molding on the injection molding raw materials so as to obtain the anisotropic bonded rare-earth permanent magnet material. The composite resin binders comprise polyphenylene sulfide ketone, polybutylene terephthalate, styrene-ethyl acrylate copolymers and bentonite. The anisotropic bonded rare-earthpermanent magnet material and the method have the advantage that the anisotropic bonded rare-earth permanent magnet material prepared by the aid of the method is excellent in magnetic performance, mechanical performance, temperature resistance, corrosion resistance and recycling performance.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to an anisotropic adhesive rare earth permanent magnet material and a manufacturing method thereof. Background technique [0002] Rare earth permanent magnet materials refer to permanent magnet materials made of alloys formed of rare earth metals and transition metals through a certain process. Compared with traditional magnets, ferrite and other magnetic materials, rare earth permanent magnet materials have more excellent performance, and have been widely used in various fields such as machinery, electronics, instrumentation and medical treatment. [0003] Specifically, rare earth permanent magnet materials are alloys composed of rare earth metals such as samarium and neodymium and transition metals (such as cobalt, iron, etc.), which are formed by powder metallurgy, sintered or bonded, and then magnetized by a magnetic field. A magnetic material obta...

AI Technical Summary

Problems solved by technology

[0006] However, because the injection molding process requires high temperature heating, it is difficult to avoid the deterioration of oxidation resistance and corrosion resistance of rare earth permanent magnet powder caused by high temperature.

At the same time, although the commonly used thermoplastic resin binder endows the permanent magnet with excellent heat resistance, it is obviously insufficient in terms of mechanical strength, and in the face of increasingly harsh use environments and requirements, even the heat resistance needs to be further improved

In addition, in order to meet the requirements of injection molding for the flow properties of the mixed melt, it is necessary to increase the content of thermoplastic resin binder, which usually comes at the expense of the magnetic properties and mechanical strength of permanent magnet products, but if the thermoplastic resin bond is reduced If the content of the additive is low, it will lead to poor molding caused by defects such as microscopic cavities inside the bonded magnet, which will also cause problems such as reduced mechanical strength and reduced product quality.