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Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof

A mixed rare earth, NdFeB technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the negative impact of NdFeB magnets' remanence and coercivity, and the magnetic properties are difficult to meet the application. requirements and other issues, to achieve the effect of being conducive to comprehensive utilization, promoting comprehensive utilization, and reducing industrial costs

Inactive Publication Date: 2020-03-20
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using traditional alloying methods to add mixed rare earth alloys often has a relatively large negative impact on the remanence and coercive force of NdFeB magnets, and the magnetic properties are difficult to meet the application requirements.

Method used

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  • Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof
  • Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof

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preparation example Construction

[0026] The preparation method of mixed rare earth sintered NdFeB permanent magnet, the specific steps are as follows:

[0027] Step 1: Follow High H A Re-Fe-B alloy and low H A The components of the mixed rare earth alloys are dosed separately, and the quick-setting strips of the two alloys with a thickness of 0.2-0.5mm are respectively obtained by using the quick-setting strip technology, and the quick-setting strips of the two alloys are hydrogen crushed and jet milled Make magnetic powder with an average particle size of 2-5 μm;

[0028] Step 2: Mix the two kinds of magnetic powders according to the ratio under the protection of nitrogen, mix them in the mixing tank for 1-3 hours, and after mixing evenly, they are oriented and formed under a magnetic field of 1.5T-2T, and then cold isostatic pressed at 200MPa to produce Blank;

[0029] Step 3: Put the green body in a vacuum sintering furnace for sintering, the sintering temperature is 1000-1150°C, and keep it warm for 1-...

Embodiment 1

[0042] The mass percentage is (MM 0.625 Re 0.375 ) 30 Fe bal B 1 Cu 0.1 al 0.2 and (PrNd) 30 Fe bal B 1 Cu 0.1 al 0.5 Zr 0.1 The main phase alloys are separately batched, and the process flow of rapid solidification, hydrogen crushing and jet milling is used to prepare powders with an average particle size of less than 3.5 μm. (MM) at a mass ratio of 3:7 30 Fe bal B 1 Cu 0.1 al 0.2 and (PrNd) 30 Fe bal B 1 Cu 0.1 al 0.5 Zr 0.1 After adding lubricant and anti-oxidant to the magnetic powder and mixing them evenly, the magnetic powder is oriented and shaped under a 2T magnetic field under the protection of nitrogen, and is made into a green body by 200MPa cold isostatic pressing. Put the green body into a vacuum sintering furnace, sinter and hold at 1060°C for 4 hours; then temper at 900°C for 3 hours, then perform a low-temperature tempering treatment at 540°C for 2 hours, and perform a secondary low-temperature tempering at 500°C Processing 2h. The magne...

Embodiment 2

[0048] The mass percentage is (MM) 30 Fe bal B 1 Cu 0.1 al 0.2 and (PrNd) 30 Fe bal B 1 Cu 0.1 al 0.5 Zr 0.1 The main phase alloys are separately batched, and the process flow of rapid solidification, hydrogen crushing and jet milling is used to prepare powders with an average particle size of less than 3.5 μm. (MM) at a mass ratio of 3:13 30 Fe bal B 1 Cu 0.1 al 0.2 and (PrNd) 30 Fe bal B 1 Cu 0.1 al 0.5 Zr 0.1 After adding lubricant and anti-oxidant to the magnetic powder and mixing them evenly, the magnetic powder is oriented and shaped under a 2T magnetic field under the protection of nitrogen, and is made into a green body by 200MPa cold isostatic pressing. Put the green body into a vacuum sintering furnace, sinter and hold at 1060°C for 4 hours; then temper at 900°C for 3 hours, then perform a low-temperature tempering treatment at 540°C for 2 hours, and perform a secondary low-temperature tempering at 500°C Processing 2h. The magnetic properties of...

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Abstract

The invention discloses a mixed rare earth sintered NdFeB permanent magnet. The mixed rare earth sintered NdFeB permanent magnet comprises a mixed rare earth main phase and an Re-Fe-B main phase. Theinvention further discloses a preparation method of the mixed rare earth sintered neodymium-iron-boron permanent magnet. According to the method, the double-main-phase technology is utilized, the mixed rare earth main phase and the Re-Fe-B main phase exist in the magnet, aging treatment is conducted on the two main phases from high temperature to low temperature in a targeted mode, distribution ofgrain boundary phases in the magnet and a microstructure are optimized, and the magnet has high coercive force.

Description

technical field [0001] The invention relates to the field of preparation of rare earth permanent magnet materials, in particular to a mixed rare earth sintered NdFeB permanent magnet and a preparation method thereof. Background technique [0002] NdFeB permanent magnets are the third generation of permanent magnet materials. Due to their excellent comprehensive magnetic properties, they are widely used in the electronics industry, aerospace, medical equipment, wind power, electric vehicles, robots and many other fields. They are the current market The most widely used permanent magnet material. The rare earth permanent magnet manufacturing industry mainly uses praseodymium and neodymium alloys as raw materials to manufacture NdFeB permanent magnets. However, my country's light rare earths contain a large amount of La and Ce rare earth elements, which are difficult to be effectively utilized. [0003] Sintered NdFeB magnets are the permanent magnet materials with the best ma...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 任少卿李泉王东波赵瑞金刘国征
Owner BAOTOU RES INST OF RARE EARTHS
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