Sintered Nd-Fe-B permanent-magnet material and preparation method thereof

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problem of reducing the magnetic moment of iron atoms, the decrease of the magnetic flux remanence Br of NdFeB permanent magnet materials, and the increase of NdFeB Problems such as the cost of permanent magnet materials, to achieve high coercive force, no reduction in remanence, and cost reduction

Inactive Publication Date: 2011-03-02
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, since heavy rare earth elements are expensive, increasing the coercive force of NdFeB permanent magnet materials by adding heavy rare earth elements will significantly increase the cost of NdFeB permanent magnet materials
In addition, due to the antiferromagnetic coupling between heavy rare earth elements and iron, the magnetic moment of iron atoms will be reduced, which will lead to a decrease in the magnetic flux Bs and remanence Br of NdFeB permanent magnet materials.

Method used

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  • Sintered Nd-Fe-B permanent-magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, the molecular formula of the sintered NdFeB permanent magnet material is:

[0031] Nd 18..5％ PR 10％ Fe 66.3％ B 1％ Dy 2.5％ Cu 0.1％ al 0.4％ Zr 0.2％ co 1％ , its preparation method comprises the following steps:

[0032] Step 1: Add Nd, Pr, Fe, B, Dy, Cu, Al, Zr and Co elements according to the compositional formula Nd 18..5％ PR 10％ Fe 66.3％ B 1％ Dy 2.5％ Cu 0.1％ al 0.4％ Zr 0.2％ co 1％ The indicated mass percentage content is used to prepare raw materials, and the prepared raw materials are put into the quick-setting furnace, and the vacuum degree is 2×10 -2 Heating the oven under a vacuum of Pa, then filling it with Ar gas for smelting, pouring the smelting liquid onto a copper roll with a roll speed of 1m / s after smelting, and throwing it into a quick-setting thin strip with an average thickness of 0.33mm;

[0033] Step 2: Put the quick-setting thin strip obtained in step 1 into the hydrogenation furnace to carry out the hydrogenation p...

Embodiment 2

[0036] In this embodiment, the molecular formula of the sintered NdFeB permanent magnet material is:

[0037] Nd 18..5％ PR 10％ Fe 66.3％ B 1％ Dy 2.5％ Cu 0.1％ al 0.4％ Zr 0.2％ co 1％ , its preparation method comprises the following steps:

[0038] Step 1: Add Nd, Pr, Fe, B, Dy, Cu, Al, Zr and Co elements according to the compositional formula Nd 18..5％ PR 10％ Fe 66.3％ B 1％ Dy 2.5％ Cu 0.1％ al 0.4％ Zr 0.2％ co 1％ The indicated mass percentage content is used to prepare raw materials, and the prepared raw materials are put into the quick-setting furnace, and the vacuum degree is 2×10 -2 Heating the oven under a vacuum of Pa, then filling it with Ar gas for smelting, pouring the smelting liquid onto a copper roll with a roll speed of 1m / s after smelting, and throwing it into a quick-setting thin strip with an average thickness of 0.37mm;

[0039] Step 2: Put the quick-setting thin strip obtained in step 1 into the hydrogenation furnace to carry out the hydrogenation p...

Embodiment 3

[0042] In this embodiment, the molecular formula of the sintered NdFeB permanent magnet material is:

[0043] Nd 16..5％ PR 12％ Fe 66.3％ B 1％ Dy 2.5％ Cu 0.1％ al 0.4％ Zr 0.2％ co1％ , its preparation method comprises the following steps:

[0044] Step 1: Add Nd, Pr, Fe, B, Dy, Cu, Al, Zr and Co elements according to the compositional formula Nd 16..5％ PR 12％ Fe 66.3％ B 1％ Dy 2.5％ Cu 0.1％ Al 0.4％ Zr 0.2％ co 1％ The indicated mass percentage content is used to prepare raw materials, and the prepared raw materials are put into the quick-setting furnace, and the vacuum degree is 2×10 -2 Heating the oven under a vacuum of Pa, then filling it with Ar gas for smelting, pouring the smelting liquid onto a copper roll with a roll speed of 1m / s after smelting, and throwing it into a quick-setting thin strip with an average thickness of 0.33mm;

[0045] Step 2: Put the quick-setting thin strip obtained in step 1 into the hydrogenation furnace to carry out the hydrogenation pro...

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Abstract

The invention discloses a sintered Nd-Fe-B permanent-magnet material and a preparation method thereof. The molecular formula of the sintered Nd-Fe-B permanent-magnet material is (NdPr)aFe[100%-a-b-c]BbMc, wherein M is one or a plurality of Dy, Ho, Nb, Zr, Co, Ga, Al and Cu; a, b and c represent the mass percentages of the corresponding elements; a is greater than or equal to 20% and smaller than or equal to 32%, b is greater than or equal to 0.9% and smaller than or equal to 1.2%, and c is greater than or equal to 0% and smaller than or equal to 6%; and the mass of the element Pr accounts for 20-49% of the mass of PrNd alloy. Compared with the prior art, the sintered Nd-Fe-B permanent-magnet material has the following advantage: the content of the element Pr in the Nd-Fe-B permanent-magnet material is increased by adjusting the composition and content of the Nd-Fe-B permanent-magnet material, so that the mass percentage of the element Pr in the light rare earth Nd is increased to 20-49%. Compared with the prior Nd-Fe-B permanent-magnet material, the Nd-Fe-B permanent-magnet material obtained by the invention has the advantages that the high coercive force can be maintained and simultaneously the cost is greatly lowered without reducing the remanence.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a sintered NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] At present, permanent magnet materials are widely used in many fields such as electronics, automobiles, computers, energy, machinery and medical equipment. Among them, the rare earth NdFeB permanent magnet material is the most important permanent magnet material now and for a long time in the future. Its appearance has opened up a new beginning for rare earth permanent magnet materials. [0003] At present, nearly 50% of NdFeB permanent magnet materials are used in the motor industry. The development of permanent magnet motors is closely related to the development of permanent magnet materials. The sintered NdFeB permanent magnet materials used in motors generally require high coercive force, generally around 20kOe. The coercive force is related to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16
Inventor 刘兴民陈必成闫阿儒刘壮郭帅李东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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