Preparation method of high-coercivity diffusion samarium-cobalt composite permanent magnet

Abstract

The invention discloses a preparation method of a high-coercivity diffusion samarium-cobalt composite permanent magnet. The preparation method comprises the following steps: mixing soft magnetic phasenanoscale Fe or Co powder with an organic solvent to form a diffusion source mixed solution; mixing (Sm, Re) 1 (Co, Fe, Ni, Cu) 5 alloy components, carrying out smelting, hot pressing and heat treatment, and preparing samarium-cobalt master alloy; perforating the surface of the samarium-cobalt permanent magnet by using femtosecond to nano laser pulses to form a coal ball-shaped magnet; immersingthe coal ball-shaped magnet into the diffusion source mixed solution, taking out the magnet, and presintering at low temperature under the protection of nitrogen to obtain a magnet with a diffusion source coating inside and on the surface of the magnet; and carrying out heat treatment on the obtained magnet under argon protection and a strong magnetic field to obtain the samarium-cobalt compositepermanent magnet. Through the laser perforation grain boundary diffusion technology, the soft magnetic phase and the doping elements can effectively enter the grain boundary of the samarium-cobalt magnet, the coupling effect and pinning effect of the soft magnetic phase and the hard magnetic phase are improved, the coercive force and the maximum magnetic energy product are improved, in addition, the method does not need nanometer compounding of the soft magnetic phase and the hard magnetic phase , the adopted experimental method is simple. Few impure phases are introduced, and the magnetic performance of the hard magnetic phase can be kept to the maximum extent.

Description

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AI Technical Summary

Benefits of technology

This new technology uses special materials called compound permanent magnets that have strong ferromagnetism for better performance compared to traditional methods like iron powder or rare earth metal alloy. By adding these materials into the permanent magnet's surface layer during manufacturing process, it becomes stronger without losing their original functioning due to weakening them over time. Additionally, there are no complicated steps needed after production, making the final product more reliable than previous designs.

Problems solved by technology

This patents discusses how science works with small particles called nanoplasms made from specific metals like iron or cobalt in order to make them stronger by adding extra material at different points along their length. These tiny particles help create strong yet uniform structures throughout the entire body of these atoms. By combining this type of structure onto an ingot containing nickel hydroxide solution, they were found to have improved properties compared to pure metal alloys used alone.

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