A kind of preparation method of permanent magnet material with high temperature resistance and high magnetic performance

Abstract

The invention discloses a method for preparing a permanent magnet material with high temperature resistance and high magnetic performance. The specific preparation steps are as follows: 1) stirring and mixing Nd2Fe14B magnetic powder and graphene oxide powder to form a mixed magnetic powder; then adding a titanate coupling agent After being mixed with an organic solvent, it is added to the mixed magnetic powder, then mixed with ferrocene magnetic powder, dried, and finally the dried mixed magnetic powder is mixed with bisphenol A epoxy resin, then vacuum-dried and granulated; 2) the obtained The mixed magnetic powder is molded for 10-30 minutes in a composite environment with a constant temperature of 20-200°C temperature field and an orientation field with a magnetic field strength of 0.5-3T. energy permanent magnet material. The permanent magnet material obtained by the method of the invention greatly improves the magnetic properties of the magnet at high temperature, can effectively reduce the weight loss of the magnet, and improve the corrosion resistance of the magnet.

Description

technical field [0001] The invention relates to a technology in the field of rare earth permanent magnet materials, in particular to a preparation method of a high temperature resistant and high magnetic performance permanent magnet material. Background technique [0002] The advantages of NdFeB magnets are high cost performance and good mechanical properties; the disadvantages are that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to be pulverized and corroded. It must be adjusted by adjusting its chemical composition and adopting surface treatment methods. Improvement can meet the requirements of practical application. [0003] NdFeB magnets are divided into sintered type and bonded type according to different production methods. Compared with sintered permanent magnets, bonded magnets have many advantages such as high cost performance, convenient forming of special-shaped magnets, high processing precision, good toughness, s...

AI Technical Summary

Problems solved by technology

[0002] The advantages of NdFeB magnets are high cost performance and good mechanical properties; the disadvantages are that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to be pulverized and corroded. It must be adjusted by adjusting its chemical composition and adopting surface treatment methods. To improve, in order to meet the requirements of practical application

[0004] In the existing technology, the Chinese invention patent CN101740193B, the title of the invention is: a high-performance high-resistivity rare earth permanent magnet and its preparation method. Started with technology, without adding insulating additives, studied the surface coupling process of magnetic powder, the mixing process of special resin and coupled magnetic powder, the orientation molding process of magnet temperature and pressure, etc., solved the problem of weak bonding between magnetic powder and special resin, special resin on the surface of magnetic powder There are a series of problems such as incomplete coating, easy agglomeration of special resin during processing, and limited improvement in magnetic properties of magnets after molding. From the results, it can be seen that the electrical insulation performance has indeed been significantly improved, but the high temperature resistance is not ideal. How? The development of high temperature resistant permanent magnet materials has become a development trend