Permanent magnet material and preparation method therefor

Abstract

The invention provides a permanent magnet material and a preparation method therefor for improving the saturation magnetization strength and high coercivity of the permanent magnet material. The main ingredient of the permanent magnet material is Sm<x>Fe<(1-x-y)>M<y>, wherein M is selected from one or more of Ti, V, Mo and Co; x is in an amount of 40-50wt%; y is in an amount of 0-5wt%; the crystalline grains of the permanent magnet material are anisotropic flake-shaped crystalline grains; the dimension of each of the flake-shaped crystalline grains in the width direction is 20-80nm; and the dimension of each of the flake-shaped crystalline grains in the length direction is 50-300nm. The crystalline grains of the permanent magnet material are anisotropic flake-shaped crystalline grains, so that the saturation magnetization strength of the permanent magnet material is improved consequently; and meanwhile, the dimension of the flake-shaped crystalline grains in the width direction is 20-80nm; and the dimension of the flake-shaped crystalline grains in the length direction is 50-300nm, so that the coercivity of the permanent magnet material is improved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a permanent magnet material and a method for preparing the permanent magnet material. Background technique [0002] In recent years, permanent magnet materials represented by rare earth permanent magnet materials have developed very rapidly. Since the discovery of the first generation of rare earth permanent magnet materials in the 1960s, SmCo has been developed successively. 5 、Sm 2 co 17 and Nd 2 Fe 14 B and other third-generation rare earth permanent magnets, and the maximum energy product representing the performance of rare earth permanent magnets has been increased from 20MGOe to 59.6MGOe. The process of preparing rare earth permanent magnets generally includes the traditional powder metallurgy process for preparing sintered rare earth permanent magnets and the melt rapid quenching process for preparing bonded rare earth permanent magnets. Among the...

AI Technical Summary

Problems solved by technology

However, conventionally prepared Sm 5 Fe 17 The method of permanent magnetic materials can only prepare amorphous Sm by rapid quenching 5 Fe 17 Permanent magnetic powder, then the amorphous Sm 5 Fe 17 The permanent magnet powder is heat-treated (sintered) to prepare magnetic powder, and then bonded with a binder to prepare block-shaped Sm 5 Fe 17 permanent magnet material

[0005] However, since Sm 5 Fe 17 Fe content in permanent magnet materials is less, resulting in Sm 5 Fe 17 The saturation magnetization of permanent magnet materials is low

At the same time, Sm 5 Fe 17 The main crystal phase of the permanent magnet material is the metastable Sm 5 Fe 17 phase, the Sm 5 Fe 17 It is easy to decompose at high temperature, so it is difficult to prepare dense sintered magnets by traditional sintering process

However, the grains of the Sm5Fe17 permanent magnet material prepared by the traditional rapid quenching method are isotropic (that is, the grains have no orientation), so that the formed Sm 5 Fe 17 The magnetic moment orientation of the permanent magnet material is scattered, which eventually leads to Sm 5 Fe 17 The coercive force of permanent magnet materials is low

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