Novel sintered ndfeb permanent magnet and preparation method thereof

A technology of NdFeB and permanent magnets, which is applied in the fields of magnetic objects, inductors/transformers/magnets, magnetic materials, etc. It can solve the problems of high production cost of sintered NdFeB permanent magnets, unbalanced use of rare earth resources, and high equipment performance requirements , to achieve the effect of improving the particle size distribution of magnetic powder, reducing material costs, and reducing production costs

Inactive Publication Date: 2015-02-11
浙江鑫盛永磁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The rapid growth of NdFeB permanent magnet materials and the large demand for rare earth metal Nd have favorably promoted the development of the rare earth raw material industry, but it has also caused an imbalance in the utilization of rare earth resources. In addition, the high price of raw material neodymium has led to the sintering of NdFeB. The production cost of boron permanent magnets is high, and the production process requires high sintering temperature, high energy consumption, and high requirements for equipment performance. Therefore, it is necessary to develop a sintered NdFeB permanent magnet with low production cost

Method used

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  • Novel sintered ndfeb permanent magnet and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A novel sintered NdFeB permanent magnet, the composition expression of the sintered NdFeB permanent magnet is: (Ce 0.05 ,Nd 0.95 ) 0.4 -Co 0.2 -Gd 0.3 -Fe 99.1 B 0.95 .

[0029] The preparation method of the above-mentioned sintered NdFeB permanent magnet is carried out as follows:

[0030] (1) Melt the prepared NdFeB materials, cerium, gadolinium iron and cobalt under argon protection at a temperature of 1400-1450°C using a vacuum induction quick-setting furnace, and cast the molten steel into a rotating cooling copper On the stick, prepare a NdFeB alloy sheet with a thickness of 0.2-0.4mm, the purity of the cerium used is 99.5%, and the mass fraction of gadolinium in the gadolinium iron used is 71%;

[0031] (2) Use hydrogen to break the furnace, absorb hydrogen under the hydrogen pressure of 0.1Mpa, dehydrogenate at 550°C, and crush the NdFeB alloy flakes into 100-150μm NdFeB alloy powder;

[0032] (3) The powder obtained in step (2) is further crushed into 2...

Embodiment 2

[0036] A novel sintered NdFeB permanent magnet, the composition expression of the sintered NdFeB permanent magnet is: (Ce 0.1 ,Nd 0.9 ) 0.9 -Cu 1.0 -Gd 2.0 -Zr 2.0 -Fe 94.1 B 1.05 .

[0037] The preparation method of the above-mentioned sintered NdFeB permanent magnet is carried out as follows:

[0038] (1) Melt the prepared NdFeB material, cerium, gadolinium iron, copper and zirconium under the protection of argon at a temperature of 1550-1600°C using a vacuum induction quick-setting furnace, and cast the molten steel into a rotating On the cooling copper rod, a NdFeB alloy sheet with a thickness of 0.6-0.8mm is prepared, the purity of the cerium used is 99.5%, and the mass fraction of gadolinium in the gadolinium iron used is 72%;

[0039] (2) Using hydrogen breaking furnace, absorb hydrogen under 0.1Mpa hydrogen pressure, dehydrogenate at 550°C, and crush NdFeB alloy flakes into 180-200μm NdFeB alloy powder;

[0040] (3) The powder obtained in step (2) is further c...

Embodiment 3

[0044] A novel sintered NdFeB permanent magnet, the composition expression of the sintered NdFeB permanent magnet is: (Ce 0.075 ,Nd 0.925 ) 0.5 -Gd 0.5 -Al 2.0 -Fe 97 B 1.0 .

[0045] The preparation method of the above-mentioned sintered NdFeB permanent magnet is carried out as follows:

[0046](1) Melt the prepared NdFeB materials, cerium and gadolinium iron under the protection of argon at a temperature of 1500-1550°C using a vacuum induction quick-setting furnace, and cast the molten steel onto a rotating cooling copper rod , the NdFeB alloy flakes with a thickness of 0.4-0.6mm are prepared, the purity of the cerium used is 99.5%, and the mass fraction of gadolinium in the gadolinium iron used is 71%;

[0047] (2) Utilize the hydrogen breaking furnace, absorb hydrogen under the hydrogen pressure of 0.1Mpa, dehydrogenate at 550°C, and crush the NdFeB alloy flakes into 120-160μm NdFeB alloy powder;

[0048] (3) The powder obtained in step (2) is further crushed into...

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Abstract

The invention relates to a novel sintered ndfeb permanent magnet and a preparation method thereof. The composition expression of the sintered ndfeb permanent magnet is (Cex, Nd1-x)y-Mz-Fe100-y-zB0.9-1.05, wherein x is greater than or equal to 0.05 and smaller than or equal to 0.1, y is greater than or equal to 0.4 and smaller than or equal to 0.9, z is greater than or equal to 0.5 and smaller than or equal to 5, and M is one or several of Gd, Co, Al, Cu and Zr. After the composition of the sintered ndfeb permanent magnet is designed and the production technology is improved, the material cost of the product is reduced, the integrated performance is improved, the cost performance is increased comprehensively, and the magnetic property and the anti-demagnetization performance are improved; moreover, the manufacturing cost of the product is reduced effectively, and based on the current unit price of raw materials, the cost can be reduced by 16.5 yuan / kilo, and the power consumption can be reduced by 1 kwh / kilo.

Description

technical field [0001] The invention relates to a novel sintered NdFeB permanent magnet and a preparation method thereof. Background technique [0002] NdFeB (chemical name Nd-Fe-B) rare earth permanent magnet material is the third generation of rare earth permanent magnet. , automobiles, machinery, energy and medical equipment and other fields. Sintered Nd-Fe-B permanent magnet materials occupy an important position in Nd-Fe-B permanent magnet materials. [0003] The rapid growth of NdFeB permanent magnet materials and the large demand for rare earth metal Nd have favorably promoted the development of the rare earth raw material industry, but it has also caused an imbalance in the utilization of rare earth resources. In addition, the high price of raw material neodymium has led to the sintering of NdFeB. The production cost of boron permanent magnets is high, and the production process requires high sintering temperature, high energy consumption, and high requirements for...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/16
Inventor 鲍金胜晏小兵张高敏
Owner 浙江鑫盛永磁科技有限公司
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