Anti-impact ferrous rare earth permanent magnet and its manufacturing method

Abstract

The invention provides a shock resistance iron base rare-earth permanent-magnet material and a preparation method of the same. The chemical composition are that Nd18-25, Re0.5-1.5, TM65-73, M0.1-1 and B5-6, wherein, Re is the lanthanon chosen from Dy and Tb, TM is the transition element chosen from Fe and Co, and M is the microadd element chosen from Nb, Cu and Ti. The preparation method is to increase the proportion of Nd with low hardness and high plasticity in the magnet to improve the ultimate strain energy rate so as to improve the obdurability and shock resistance of magnet. Relative to the machinable magnet of FeCrCo, the invention prepares the magnet with stronger magnetism and machinable property as well as shock resistance, thereby lowering the processing cost of magnet.

Description

technical field [0001] The invention belongs to the field of manufacturing rare earth permanent magnet materials, and is particularly suitable for the preparation of impact-resistant iron-based rare earth permanent magnet materials. Background technique [0002] As an important metal functional material, rare earth permanent magnet materials are widely used in many fields such as aerospace and navigation, information electronics, energy, transportation, communication, and medical care. In fact, the industry has not stopped improving Nd-Fe-B permanent magnet materials. For example, Chinese patent application 92100958.5 (application date 1992.01.31) discloses a "rare earth-iron-boron anisotropic magnet" , is an R-Fe-B coefficient body with excellent magnetic anisotropy and a small temperature coefficient of coercive force. It is made of hydrogen-treated R-Fe-B permanent magnet powder, and its components are: R: 10-20%, B: 3-20%, Ti, V, Nb, Ta, Al and One or two or more eleme...

AI Technical Summary

Problems solved by technology

This makes rare earth permanent magnet materials difficult to process, increases the processing cost of the material, and reduces the processing accuracy of the material; at the same time, the poor impact resistance also makes the material easy to drop edges and corners during production, processing, transportation, assembly, etc. Even broken; low shock and vibration resistance, affecting the stability and safety of the material during use

[0005] In short, poor toughness not only increases the production cost of rare earth permanent magnet materials, but also seriously restricts the further expansion of the application range of materials.

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