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Low-cost rare earth iron-boron permanent magnet and preparation method therefor

A rare-earth permanent magnet and rare-earth permanent magnet technology, which is applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of being unable to be used as sintered magnets, low coercive force and magnetic energy product, and achieve crystallization performance improvement. , Simple preparation process, reduced raw material cost and production cost

Active Publication Date: 2016-11-16
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coercive force and magnetic energy product of sintered Ce-Fe-B magnets (bulk materials) are very low, and there is almost no magnetism.
Literature [IEEE Transactions on Magnetics,2014,50:2104604] reports that the prepared sintered Ce 30.5 Fe bal. B 1 The magnet has an intrinsic coercive force of 0.1kOe and a magnetic energy product of 0.07MGOe, which cannot be used as a practical sintered magnet

Method used

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  • Low-cost rare earth iron-boron permanent magnet and preparation method therefor
  • Low-cost rare earth iron-boron permanent magnet and preparation method therefor
  • Low-cost rare earth iron-boron permanent magnet and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: According to the design composition Ce 40 Fe bal B 1.5 TM 12 (TM = Al, Co, Mn, Ni) (wt.%) The raw materials are prepared, and the rare earth elements in the magnet alloy all use reserves, abundant and cheap Ce.

[0032] Step 2: Melt the prepared raw materials to prepare a quick-setting belt. First put the raw materials into the crucible of the quick-setting furnace, and conduct vacuum induction melting under the protection of argon. After the raw materials are fully melted to form an alloy, keep the temperature of 1300~1400℃, and pour the alloy liquid to a linear velocity of 1.0~3.0 m / s On the water-cooled copper roller of, prepare quick-setting sheet with an average thickness of 0.28~0.30mm.

[0033] Step 3: Crushing and milling: Ce prepared in the step 2 40 Fe bal B 1.5 TM 12 (TM = Al, Co, Mn, Ni) (wt.%) quick-setting flakes are charged into a hydrogen breaker, undergo hydrogen crushing, absorb hydrogen at a pressure of 0.1~0.2MPa at room temperature, and then un...

Embodiment 2

[0043] Step 1: According to the design composition (Ce 0.95 RE 0.05 ) 38 Fe bal B 1.4 TM 8 (RE = Gd, Y, Er; TM = Al, Co, Cu, Nb, Ni) (wt.%) Preparation of raw materials, of which: Ce content accounts for 95% of the total rare earth.

[0044] Step 2: Melt the prepared raw materials to prepare a quick-setting belt. First put the raw materials into the crucible of the quick-setting furnace, and conduct vacuum induction melting under the protection of argon. After the raw materials are fully melted to form an alloy, keep the temperature of 1300~1400℃, and pour the alloy liquid to a linear velocity of 1.0~3.0 m / s On the water-cooled copper roller of, prepare quick-setting sheet with an average thickness of 0.28~0.30mm.

[0045] Step 3: Crushing and pulverizing: the (Ce 0.95 RE 0.05 ) 38 Fe bal B 1.4 TM 8 (RE = Gd, Y, Er; TM = Al, Co, Cu, Nb, Ni) (wt.%) The quick-setting flakes are charged into a hydrogen crushing furnace for hydrogen crushing, and hydrogen is absorbed at a pressure of...

Embodiment 3

[0053] Step 1: According to the design composition (Ce 0.9 RE 0.10 ) 36 Fe bal B 1.35 TM 5 (RE = Gd, Y, Er; TM = Al, Co, Cu, Nb, Ni) (wt.%) Preparation of raw materials, of which: Ce content accounts for 90% of the total rare earth.

[0054] Step 2: Melt the prepared raw materials to prepare a quick-setting belt. First put the raw materials into the crucible of the quick-setting furnace, and conduct vacuum induction melting under the protection of argon. After the raw materials are fully melted to form an alloy, keep the temperature of 1300~1400℃, and pour the alloy liquid to a linear velocity of 1.0~3.0 m / s On the water-cooled copper rolls, prepare quick-setting sheets with an average thickness of 0.25 to 0.35 mm.

[0055] Step 3: Crushing and pulverizing: the (Ce 0.9 RE 0.10 ) 36 Fe bal B 1.35 TM 5 (RE = Gd, Y, Er; TM = Al, Co, Cu, Nb, Ni) (wt.%) The quick-setting flakes are charged into a hydrogen crushing furnace for hydrogen crushing, and hydrogen is absorbed at a pressure o...

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Abstract

The invention belongs to the technical field of a rare earth permanent magnet material, and relates to a high-Ce-content and low-cost rare earth iron-boron permanent magnet and a preparation method therefor. The chemical formula of the permanent magnet is as follows based on mass percentage: (Ce<1-x>RE<x>)(Fe, TM)<100-a-b>B, wherein x is greater than or equal to 0 and less than or equal to 0.20; a is greater than or equal to 28 and less than or equal to 40; b is greater than or equal to 1.21 and less than or equal to 1.50; RE is selected from one or several kinds of rare earth elements of Pr, Nd, Ho, Gd, Y, La or Er; and TM is selected from one or several kinds of Ga, Co, Al, Si, Cu, Nb, Zr, Ti, Mn, Ni, Ag or Su. The preparation method for the rare earth permanent magnet material comprises the steps of preparing raw materials, preparing a strip-casting flake, and carrying out hydrogen crushing, orientation shaping and pressing, sintering and thermal treatment. According to the low-cost rare earth iron-boron permanent magnet, the efficient utilization of the low-cost Ce element can be realized; particularly, the content of Ce accounts for 80-100% of the total rare earth content; a sintered magnet with relatively high coercivity and comprehensive magnetic performance still can be obtained; and in addition, the maximum magnetic energy product (BH)max of the permanent magnet is greater than or equal to 10MGOe, so that the low-cost rare earth iron-boron permanent magnet has the remarkable cost and price advantages.

Description

Technical field [0001] The invention relates to a novel rare earth permanent magnet material, in particular to a low cost rare earth iron boron permanent magnet with high Ce content and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnet material has the characteristics of high remanence and high magnetic energy product. It is widely used in the fields of electronics, information, energy, power, transportation and cutting-edge technology. It is one of the basic materials of modern industry. In recent years, with the rapid development of new energy vehicles, wind power generation and high-efficiency energy-saving home appliances, the demand for rare earth permanent magnet materials has increased day by day. [0003] Since sintered NdFeB permanent magnet materials mainly use Pr and Nd as raw materials, the coercive force and temperature stability are further improved by adding heavy rare earths Dy and Tb, while the relatively high reserves of l...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F1/0577H01F41/0293
Inventor 李卫李安华冯海波朱明刚赵扬张月明
Owner CENT IRON & STEEL RES INST
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