A kind of preparation method of thin sheet type rare earth permanent magnet material

Abstract

The invention improves a preparation method of a thin sheet type rare earth permanent magnet material, and relates to the technical field of magnetic materials. A method for preparing a thin sheet-type rare earth permanent magnet material, comprising the following steps: (1) Preparation of a main phase alloy, mixing materials containing neodymium, dysprosium, iron, and boron respectively to prepare a main phase alloy, and then pulverizing , grinding, and sieving to obtain the main phase alloy powder; (2) preparation of the grain boundary phase alloy, mixing materials containing neodymium, Co, Mo, boron, and iron respectively, and then performing rapid solidification, and the quenching rate is 27-35m / s, prepare a grain boundary alloy, and then pulverize it to obtain a grain boundary phase alloy powder; (3) Mix the main phase alloy powder, grain boundary phase alloy powder, magnesium oxide, and zinc oxide evenly, then perform molding, press into a sheet-shaped green embryo, and then Sintering, cooling after tempering to obtain thin sheet type rare earth permanent magnet material. According to the preparation method of the thin sheet type rare earth permanent magnet material of the present invention, the prepared rare earth permanent magnet material has excellent magnetic properties, high bending strength and strong corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of a thin sheet type rare earth permanent magnet material. Background technique [0002] Permanent magnet materials are also called "hard magnetic materials". A material that maintains a constant magnetic field once magnetized. It has wide hysteresis loop, high coercive force and high remanence. In practice, permanent magnet materials work in the second quadrant demagnetization part of the hysteresis loop after deep magnetic saturation and magnetization. Commonly used permanent magnet materials are divided into AlNiCo permanent magnet alloys, FeCrCo permanent magnet alloys, permanent ferrites, rare earth permanent magnet materials and composite permanent magnet materials. [0003] Permanent magnet materials include ferrite permanent magnets, rare earth permanent magnets (rare earth cobalt, neodymium iron boron, etc.), alnico, iron chromium cobal...

AI Technical Summary

Problems solved by technology

Among them, although metal alloy magnets and ferrite magnetic materials have the advantages of low cost and abundant raw materials, their maximum magnetic energy product (BH)max is generally less than 10MGOe, and their magnetic properties are poor, so they are gradually replaced by rare earth permanent magnet materials.

[0007] The permanent magnet materials in the prior art have low bending strength, poor wear resistance, and limited corrosion resistance. When used for a long time, the grain boundaries will be easily corroded, and the magnetism will be destroyed during long-term use, shortening the service life.

Images