Preparation method for permanent-magnet material with high temperature resistance and high magnetic performance

Abstract

The invention discloses a preparation method for a permanent-magnet material with high temperature resistance and high magnetic performance. The preparation method comprises the steps of 1) uniformly stirring and mixing Nd2Fe14B magnetic powder and graphene oxide powder to prepare mixed magnetic powder, mixing and adding a titanate coupling agent and an organic solvent into the mixed magnetic powder, mixing the product with ferrocene magnetic powder, performing drying, and performing vacuum drying and granulation after the dried mixed magnetic power and bisphenol A epoxy resin are mixed; and 2) forming the mixed magnetic powder obtained in the step 1) for 10-30 minutes in a composite environment of a temperature field with a constant temperature being 20-200 DEG C and an orientation field with magnetic field intensity being 0.5-3T so as to prepare the permanent-magnet material with high temperature resistance and high magnetic performance, wherein the formation pressure range is (2-8)ton/cm<2>. According to the method, the magnetic performance of a magnet is greatly improved by the permanent-magnet material, the weight loss of the magnet can be effectively reduced, and the corrosion resistance of the magnet is improved.

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