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A kind of preparation method of high performance neodymium iron boron magnet

A NdFeB, high-performance technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high production cost and heavy use of heavy rare earth elements, and achieve low production cost and reduced remanence. , the effect of coercivity improvement

Active Publication Date: 2020-06-30
NINGBO ZHAOBAO MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the sintered NdFeB magnet has a high coercive force, the second alloy contains at least one of the heavy rare earth element Dy or Tb. After high-temperature sintering, the second alloy diffuses into the first alloy. During the preparation process Heavy rare earth elements still need to be used more, and the production cost is still high

Method used

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  • A kind of preparation method of high performance neodymium iron boron magnet
  • A kind of preparation method of high performance neodymium iron boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) The NdFeB alloy quick-setting sheet is made by the quick-setting process, and the composition of the Nd-Fe-B alloy is Nd 31.5 Fe 66.31 B 0.95 co 1.2 Cu 0.04 ;

[0018] 2) Coarsely crush the quick-setting tablet into coarse particles of 50-200 microns, dissolve dysprosium nitrate in deionized water to prepare a solution with a concentration of 0.01mol / L, and put 1kg of the above-mentioned coarse particles into 0.5L of the above-mentioned solution , and add 5gNaBH 4 Ball mill for 1 hour;

[0019] 3) washing the above-mentioned ball-milled product with deionized water, and freeze-drying;

[0020] 4) Orientate the dried powder into a magnetic field, the magnetic field is 1.6T, 200MPa isostatic pressing, vacuum sintering, vacuuming to 1×10 -2 Pa, first heat up to 200°C and sinter for 0.5 hours, then heat up to 1040°C and sinter for 2 hours to make NdFeB magnets.

[0021] As a comparison, in this embodiment, the situation of not adding dysprosium nitrate in the bal...

Embodiment 2

[0025] 1) The NdFeB alloy quick-setting sheet is made by the quick-setting process, and the composition of the Nd-Fe-B alloy is Nd 30.5 Fe 67.31 B 0.95 co 1.2 Cu 0.04 ;

[0026] 2) Coarsely crush the quick-setting tablet into coarse particles of 50-200 microns, dissolve dysprosium acetate in deionized water to prepare a solution with a concentration of 0.02mol / L, and put 1kg of the above-mentioned coarse particles into 0.5L of the above-mentioned solution , and add 10gNaBH 4 Ball milling for 1.2 hours;

[0027] 3) washing the above-mentioned ball-milled product with deionized water, and freeze-drying;

[0028] 4) Orientate the dried powder into a magnetic field, the magnetic field is 1.8T, 220MPa isostatic pressing, vacuum sintering, vacuuming to 1×10 -2 Pa, first heat up to 220°C and sinter for 0.5 hours, then heat up to 1050°C and sinter for 2.2 hours to make NdFeB magnets.

[0029] As a comparison, in this embodiment, the situation of acetate without dysprosium adde...

Embodiment 3

[0033] 1) The NdFeB alloy quick-setting sheet is made by the quick-setting process, and the composition of the Nd-Fe-B alloy is Nd 30.5 Fe 67.26 B 0.1 co 1.2 Cu 0.04 ;

[0034] 2) Coarsely crush the quick-setting tablet into coarse particles of 50-200 microns, dissolve terbium nitrate in deionized water to prepare a solution with a concentration of 0.03mol / L, and put 1kg of the above-mentioned coarse particles into 0.5L of the above-mentioned solution , and add 15gNaBH 4 Ball mill for 1 hour;

[0035] 3) washing the above-mentioned ball-milled product with deionized water, and freeze-drying;

[0036] 4) Orientate the dried powder into a magnetic field, the magnetic field is 1.6T, 250MPa isostatic pressing, vacuum sintering, vacuuming to 1×10 -2 Pa, first heat up to 250°C and sinter for 0.7 hours, then heat up to 1050°C and sinter for 2 hours to make NdFeB magnets.

[0037] As a comparison, in this embodiment, the case of not adding terbium nitrate during the ball milli...

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Abstract

The invention discloses a preparation method of a high-performance neodymium-iron-boron magnet, comprising the following steps: 1) a NdFeB alloy quick-setting sheet is prepared by adopting a quick-setting process, wherein the chemical formula of NdFeB alloy is NdxFe100-x-y-z-x1ByCozCux1, and the mass percentage is x: 30-31.5, y:0.95-1, z:1-1.2, x1:0-0.06; 2) coarsely crushing the quick-setting sheet, placing the quick-setting tablet into a solution contain Dy or Tb for ball milling, and adding a reducing agent, wherein the concentration of the solution containing Dy or Tb is 0.01 to 0.1 mol / L,the solution is prepared by dissolving the compound containing Dy or Tb in deionized water, and the addition amount of the reducing agent is 3 to 5 moles of reducing agent per mole of Dy or Tb; 3) washing that ball-milled product with deionized water and drying; 4) shaping the dried powder by magnetic field orientation, performing isostatic pressing and vacuum sintering to obtain the NdFeB permanent magnet material.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, more specifically, it relates to a preparation method of a high-performance NdFeB magnet. Background technique [0002] Sintered NdFeB magnets have been widely used for their excellent comprehensive performance and relatively low price since their invention. In recent years, with the accelerated development of science and technology, the promotion speed and application scope of sintered NdFeB magnets in high-end fields such as new energy vehicles, inverter compressors and wind power have expanded rapidly. These fields require sintered NdFeB magnets to have high comprehensive magnetic properties, that is, high remanence and high coercive force. [0003] The existing high-performance sintered NdFeB magnets mainly have two structures. In a sintered NdFeB magnet with a structure, heavy rare earth elements (at least one of Dy or Tb) are uniformly distributed inside the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/16C22C38/10
CPCC22C38/005C22C38/10C22C38/16H01F1/0577H01F41/0253H01F41/0266H01F41/0293
Inventor 林建强贺琦军
Owner NINGBO ZHAOBAO MAGNET