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Rare-earth permanent magnet and production method thereof

A rare earth permanent magnet and magnet technology, applied in the field of material manufacturing, can solve the problems of magnet remanence and reduction of coercivity, and achieve the effects of high coercivity, large magnetic energy product and cost reduction

Active Publication Date: 2015-04-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However Ce 2 Fe 14 The saturation magnetization and anisotropy field of B are higher than those of Nd 2 Fe 14 When B is low, the remanence and coercive force of the magnet will decrease after the addition of Ce

Method used

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  • Rare-earth permanent magnet and production method thereof
  • Rare-earth permanent magnet and production method thereof
  • Rare-earth permanent magnet and production method thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing the above-mentioned rare earth permanent magnet, comprising the following steps:

[0033] (1) Configure raw materials: according to MM a-b HRE b Fe e B d tm c The mass ratio of a certain amount of metal or alloy raw materials containing corresponding elements is configured, where MM stands for (LRE 1-x Ce x ), and x and 1-x are mass ratios, LRE is one or both of Pr and Nd, and HRE is one or two of La, Y, Gd, Tb, Dy, Ho, Er, Yb, Tm Several, TM is one or more of Al, Cu, Mn, Ga, Nb, Zr, and 0.24≤x≤0.6, 27≤a≤36, 0≤b≤10, 0≤c≤3, 0.8 ≤d≤1.5, e=100-a-d-c-d. Preferably, the raw material of the rare earth element is a mixed rare earth alloy. For example, an alloy containing at least two elements in the three elements of Ce, Pr, and Nd can be used, so that the separation process of the rare earth element is reduced, thereby avoiding energy loss in the separation process. consumption and environmental pollution.

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Embodiment 1

[0057] A kind of rare earth permanent magnet, mass ratio chemical formula is [(Pr 0.2 Nd 0.8 ) 76 Ce 24 ] 27.5 Dy 3 Fe 68.3 al 0.1 Cu 0.1 B 1 , it can be known from the chemical formula that 24wt.% of Pr / Nd is replaced by Ce. The rare earth permanent magnet was prepared according to the preparation method of Comparative Example 2.

[0058] Image 6 It is the microstructure diagram of the rare earth permanent magnet of embodiment 1, as can be seen from the figure, the rare earth permanent magnet includes 2-14-1 phase, CeFe 2 phase and rare earth-rich phase, among which, CeFe 2 The phase is mainly distributed at the triangular grain boundary in the rare earth permanent magnet.

Embodiment 2

[0060] A kind of rare earth permanent magnet, mass ratio chemical formula is [(Pr 0.2 Nd 0.8 ) 68 Ce 32 ] 27.5 Dy 3 Fe 68.3 al 0.1 Cu 0.1 B 1 , it can be known from the chemical formula that 32wt.% of Pr / Nd is replaced by Ce. The rare earth permanent magnet was prepared according to the preparation method of Comparative Example 2.

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Abstract

The present invention provides a rare-earth permanent magnet and a preparing method thereof. A general molecular formula of a mass ratio of the rare-earth permanent magnet is MMa-bHREbFeeBdTMc, MM representing (LRE1-xCex), and x and 1-x are both mass ratios; LRE being one or two of Pr and Nd; HRE being one or several of La, Y, Gd, Tb, Dy, Ho, Er, Yb, and Tm; Tm being one or several of Al, Cu, Mn, Ga, Nb, and Zr; and 0.24≤x≤0.6, 27≤a≤36, 0≤b≤10, 0≤c≤3, 0.8≤d≤1.5, and e=100-a-d-c-d. A principal phase of the rare-earth permanent magnet being a 2-14-1 phase; in addition, there are also a rich rare earth phase and a CeFe2 phase. According to the rare-earth permanent magnet and the preparing method thereof in the present invention, a part of cerium is used to replace praseodymium or neodymium, so that the cost of the rare-earth permanent magnet is reduced significantly, and high coercivity is maintained.

Description

technical field [0001] The invention relates to the field of material manufacturing, in particular to a rare earth permanent magnet and a preparation method thereof. Background technique [0002] As the third generation of rare earth permanent magnet materials, with neodymium iron boron (Nd 2 Fe 14 B) Rare earth permanent magnet materials with phase structure and similar structures are rapidly applied in computer hard disks, nuclear magnetic resonance imaging, hybrid vehicles, wind power generation and other fields due to their excellent performance. At present, my country's NdFeB production accounts for more than 80% of the world's total, which is mainly due to the strong demand in fields such as hybrid vehicles and wind power generation. For example, on average, each hybrid vehicle needs 2-3kg NdFeB-based permanent magnet materials, and each megawatt wind turbine needs 0.5-1t NdFeB-based permanent magnets. [0003] Although NdFeB-based permanent magnets have a wide rang...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F1/053H01F1/08H01F41/02B22F3/16
CPCC22C38/002C22C38/005C22C38/06C22C38/16H01F1/0577H01F41/0273
Inventor 严长江闫阿儒郭帅陈仁杰李东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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