SAMARIUM-COBALT MAGNET AND METHOD FOR MAKING THE SAME

DE112022007392T5Pending Publication Date: 2025-03-27HANGZHOU PERMANENT MAGNET GRP
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Patent Information

Application Number
DE112022007392
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-09-30
Filing Date
2022-12-02
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

The hydrogen destruction efficiency of samarium cobalt magnets is low, which makes it difficult to popularize the preparation process of hydrogenation and jet milling for rapid solidification cast flakes, and existing improved methods have safety hazards or problems with reduced magnetic properties.

Method used

A combination of SmCoFeCuZr base alloy cast flakes and Re-M alloy diffusion layer is used. The Re-M alloy is coated on the surface of the SmCoFeCuZr base alloy cast flakes and diffuses inside. Through diffusion heat treatment, tempering treatment and hydrogen destruction treatment, samarium cobalt magnetic powder is formed. , and press molding, sintering and solution treatment under a magnetic field to obtain samarium cobalt magnets.

Benefits of technology

It improves the hydrogen breaking rate and magnetic properties of samarium cobalt magnets, reduces hydrogen absorption pressure and time, reduces safety risks, and improves production efficiency and the comprehensive performance of the magnets.

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Abstract

The invention relates to a samarium-cobalt magnet and a method for its production. The samarium-cobalt magnet comprises a casting made of an SmCoFeCuZr base alloy and a diffusion layer of a Re-M alloy. The Re-M alloy diffusion layer coats the surface of the SmCoFeCuZr base alloy casting and diffuses into the interior of the SmCoFeCuZr base alloy casting. The Re element is at least one element selected from the group consisting of Pr, Nd, Ce, and La, and the M element is at least one element selected from the group consisting of Cu, Al, and Ga. Since the SmCoFeCuZr base alloy casting is relatively thin, the Re-M alloy coats its surface and diffuses uniformly to the entire crystal boundary of the casting.This significantly reduces defects at the crystal boundary while simultaneously increasing the integrity and orientation of the grains, so that the samarium-cobalt magnet obtainable through the application has good magnetic properties.
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