Methods for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets

Abstract

The invention discloses a method for manufacturing cerium-rich anisotropy nano-crystalline rare-earth permanent magnets. The method includes (1), proportioning materials according to a chemical formula of (Ce<x>, RE<1-x>)Fe<100-a-b-c>BTM<c>; (2), melting the materials to obtain alloy ingots; (3), crushing the alloy ingots, and then rapidly quenching melt to obtain rapidly quenched magnetic powder; (4), carrying out hot-pressing on the rapidly quenched magnetic powder for 1-10 minutes at the temperatures ranging from 500 DEG C to 800 DEG C under the pressures ranging from 100MPa to 300MPa, and then enabling the rapidly quenched powder to thermally deform for 3-10 minutes at the temperatures ranging from 600 DEG C to 900 DEG C under the pressures ranging from 50MPa to 200MPa. The invention further provides a method for manufacturing the cerium-rich anisotropy nano-crystalline rare-earth permanent magnets according to chemical formulas of (Ce<x>, RE<1-x>)Fe<100-a-b-c>BTM<c> and NdFe<100-a-b-c>BTM<c>. The methods have the advantages that processes can be simplified, the cost can be reduced, and the obtained cerium-rich anisotropy nano-crystalline rare-earth permanent magnets are excellent in magnetic performance.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a preparation method of anisotropic nanocrystalline rare earth permanent magnets containing Ce. Background technique [0002] As the scale of the NdFeB industry continues to grow, the raw material neodymium metal and praseodymium-Nd alloy resources used in NdFeB magnets are becoming more and more scarce. Ce 2 Fe 14 B has magnetic properties at room temperature, and its saturation magnetic polarization is 1.17T, which provides a theoretical basis for using Ce to prepare magnets to replace part of neodymium metal and praseodymium neodymium alloy resources, and in natural rare earth resources, the reserves of Ce Plentiful and inexpensive. [0003] At present, the traditional sintering method is used to prepare anisotropic rare earth permanent magnets containing Ce. Although high-performance anisotropic magnets can be prepared, the process...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional sintering method is used to prepare anisotropic rare earth permanent magnets containing Ce. Although high-performance anisotropic magnets can be prepared, the process is complicated and requires hydrogen explosion, dehydrogenation, jet milling, mixing, and magnetic fields. Forming and sintering processes have long production cycle, low efficiency, long sintering time, high sintering temperature (1000℃~1100℃), and high energy consumption

In addition, due to the high activity of Ce, it is easily oxidized in the process of jet milling, mixing and magnetic field forming orientation, resulting in performance deterioration. Therefore, strict measures must be taken in the entire production process to control the entire process, which further leads to increased production costs.

The patent application with publication number CN102800454A discloses a "low-cost dual-main-phase Ce permanent magnet alloy and its preparation method". The dual-main-phase alloying method is used to prepare anisotropic sintered magnets, but the basic process flow is the same as the traditional process. Therefore, the process is complicated, the production cycle is long, and the efficiency is low. In addition, Ce is easily oxidized by contact with oxygen during hydrogen explosion, jet milling, mixing and molding processes, thereby affecting the magnetic properties of the product.

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