Preparation method of high-toughness and high-performance samarium-cobalt magnet

Abstract

The invention relates to the technical field of samarium-cobalt magnets and particularly relates to a preparation method of a high-toughness and high-performance samarium-cobalt magnet, which comprises the following steps S1, preparing a cladding material; S2, the nanocrystalline powder alloy obtained in the step S1 being mixed with iron-based self-fluxing alloy nanopowder according to the proportion; S3, removing an oxidation film on the surface of the samarium-cobalt magnet; S4, uniformly coating the pasty nano cladding solution obtained in the step S2 on a surface of the samarium-cobalt magnet obtained in the step S3; S5, the magnet with the preset cladding layer in the S4 being subjected to laser heating layer-by-layer cladding treatment to obtain a laser cladding layer; and S6, carrying out nitriding heat treatment on the body with the laser cladding layer in the step S5 in a high-intensity magnetic field, uniformly mixing nanocrystalline powder alloy, iron-based self-fluxing alloy powder, rare earth powder and an acetone solution mixed with nitrocellulose, coating a surface of the samarium-cobalt magnet with the mixture, and laser being subjected to nitriding heat treatment in a high-intensity magnetic field to be compounded with the samarium-cobalt magnet so that the samarium-cobalt magnet is higher in toughness and stability.

Description

technical field [0001] The invention relates to the technical field of samarium-cobalt magnets, in particular to a preparation method of a strong and tough high-performance samarium-cobalt magnet. Background technique [0002] The development of rare earth permanent magnet materials is represented by the three generations of permanent magnets of Sm-Co system and Nd-Fe-B system, among which the Nd-Fe-B system permanent magnet is named "magnet king" for its excellent permanent magnetic properties. However, the shortcomings of Nd-Fe-B rare earth permanent magnet materials are also obvious in the application process, such as: low Curie temperature (Tc) (~312°C), poor corrosion resistance, poor temperature stability, etc. With the continuous development of science and technology, there is an urgent need for permanent magnetic materials that can still maintain high permanent magnetic properties in extreme environments. Therefore, Sm-Co series rare earth permanent magnets have bee...

AI Technical Summary

Problems solved by technology

However, Sm-Co-based rare earth permanent magnets have poor toughness due to their intermetallic compound structure, that is, the structure is complex and there are few slip systems.

For example, the traditional 2:17 sintered samarium cobalt alloy has a flexural strength of only 80-140MPa and a fracture toughness of 1.5-2.5MPa, which is comparable to the fracture toughness value of ceramic materials, and it is difficult to meet the safety requirements of samarium-cobalt magnets in special vibration environments. service

[0003] Samarium-cobalt magnet is also a kind of rare earth magnet. It is a permanent magnet made of samarium, cobalt and other metal materials. It was successfully developed in 1970. Its main features are relatively high magnetic properties and good temperature resistance. Samarium Cobalt magnets have a higher magnetic energy product and higher coercivity. Compared with NdFeB, SmCo is more suitable for working in high temperature environments. SmCo has good corrosion resistance, so generally speaking, no coating is required , but due to the special molecular structure of samarium cobalt, it is relatively fragile and easy to crack. Therefore, a preparation method of strong toughness and high performance samarium cobalt magnet is proposed