A cerium-containing high-coercivity rare earth permanent magnet and preparation method thereof

By adopting the dual alloy form in the preparation of rare earth permanent magnets, combining the use of cerium and cobalt elements, grain boundary reconstruction is carried out to form a new main phase and rare earth-rich phase, the utilization limitations of cerium elements in neodymium iron boron magnets are solved, and the coercivity of the permanent magnet and the utilization rate of cerium elements are improved.

CN119252590BActive Publication Date: 2025-03-25BAOTOU INST MAGNETIC NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202411793824.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-25
Estimated Expiration
2044-12-09

AI Technical Summary

Technical Problem

The existing cerium-based sintered NdFeB magnets have lower intrinsic magnetic properties than the Nd2Fe14B phase, and as the cerium content increases, the proportion of REFe2 phase in the magnet increases, resulting in deterioration of magnetic properties, limiting the widespread use of cerium elements in the preparation of NdFeB magnets.

Method used

Rare earth permanent magnets are prepared in the form of a dual alloy. By including cerium in the main phase alloy and cobalt in the auxiliary phase alloy, grain boundary reconstruction is carried out to form a new (REH, Ce)2(Fe, Co)14B main phase and rare earth-rich phase, thereby improving the intrinsic coercivity of the permanent magnet.

Benefits of technology

While maintaining the magnetic properties of permanent magnets, it is possible to improve the utilization rate of cerium elements, reduce the preparation cost, and effectively reduce the deterioration of magnetic properties caused by the soft magnetic properties of the CeFe2 phase and the RE'Fe2 phase.

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Abstract

The present invention discloses a cerium-containing high-coercivity rare earth permanent magnet and a preparation method thereof. The permanent magnet has a composition of RE in terms of mass percentage. a N b Fe 100‑a‑b‑c‑d Co c B d , RE is a combination of two or more of the rare earth elements lanthanum, cerium, praseodymium, and neodymium, and must contain cerium, the mass percentage of cerium is not less than 6%, N is one or more of aluminum, copper, gallium, and zirconium. The permanent magnet is prepared by forming a double alloy from two raw materials, a main phase alloy and an auxiliary phase alloy, the main phase alloy contains cerium, and the auxiliary phase alloy contains cobalt. The addition of cobalt can reduce the precipitation of CeFe2 phase, form a new main phase, increase the volume proportion of the main phase of the permanent magnet, avoid the problem of deterioration of magnetic properties due to the addition of cerium, and make the prepared cerium-containing rare earth permanent magnet have high coercive force.
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