A kind of preparation method of fine spherical sm-fe-n series permanent magnetic powder

Abstract

The invention provides a preparation method of micro spherical Sm-Fe-N series permanent magnetic powder, and belongs to the technical field of powder preparation. The preparation method is characterized in that refined Sm-Fe series alloy liquid is atomized and crushed into a plurality of fine liquid drops by high-pressure argon through nozzles of diversion pipes; in a rapid condensation process of the liquid drops, high-pressure nitrogen is applied rapidly, so that nitridation is conducted on the liquid drops so as to generate the micro spherical Sm-Fe-N series permanent magnetic powder. The average particle size of the micro spherical Sm-Fe-N series permanent magnetic powder prepared in the method ranges from 10 microns to 80 microns, and the micro spherical Sm-Fe-N series permanent magnetic powder has the advantages of being smooth in surface, high in sphericity, good in flowability, low in oxygen content, high in cooling speed and the like, and is suitable for injection molding bonded permanent magnets. Nitridation is achieved in a powder preparation process, and the preparation technological process of the micro spherical Sm-Fe-N series permanent magnetic powder is shortened. According to the preparation method, equipment is relatively simple and easy to operate.

Description

technical field [0001] The invention relates to a preparation method of fine spherical Sm-Fe-N permanent magnet powder, which belongs to the technical field of powder preparation. Background technique [0002] SmFeN rare earth permanent magnet materials are one of the research hotspots in the field of permanent magnet materials today. Among them, the Sm2Fe17Nx rare earth permanent magnet material has excellent intrinsic magnetic properties, and its saturation magnetization reaches 1.54T, which is comparable to that of Nd-Fe-B at 1.6T; its anisotropy field is higher than that of Nd-Fe-B The anisotropy field is twice as large; its Curie temperature is 476°C, which is 160°C higher than that of Nd-Fe-B; and its corrosion resistance, thermal stability, and oxidation resistance are also better than Nd-Fe-B permanent magnet material. [0003] However, the binary Sm2Fe17 compound has an easy basal plane and a low anisotropy field, so it cannot be made into a practical permanent ma...

AI Technical Summary

Problems solved by technology

Among them, the mechanical alloying method does not require large-scale equipment and is a simple method of manufacturing magnetic powder. However, due to long-term ball milling, the mechanical alloying method is very easy to cause powder oxidation, coupled with the disadvantages of long cycle, which limits its use in production. Promoted Apps in

The Sm2Fe17 compound prepared by the melt rapid quenching method has uniform structure and composition, fine grains, but the powder is lamellar and has poor fluidity

The reduction diffusion method uses a reducing agent to reduce rare earth oxides to make them into rare earth metals, and then directly obtains rare earth permanent magnet powders through the interdiffusion of rare earth metals and transition metals. The advantage of this method for preparing Sm2Fe17Nx compound powders is that the cost of raw materials is low. more difficult to implement

The HDDR process has the characteristics of simple equipment, good uniformity, low oxygen content, high yield, and can prepare not only isotropic but also anisotropic magnets, etc., but the process involves many reactions, and the process and mechanism are complex.

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