Method for improving performance of sintered Nd-Fe-B permanent magnetic material

A permanent magnet material, neodymium iron boron technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of product mechanical properties and corrosion resistance, small practical size, etc., to reduce residual magnetism and reduce consumption , cost-saving effect

Active Publication Date: 2009-12-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

However, there are still many defects in the method of improving the performance of NdFeB by using the grain boundary diffusion method. The key is that this method can only be used for 1-3mm magnet sheets, the practical size is small, and the mechanical properties and corrosion resistance of the product are reduced.

Method used

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  • Method for improving performance of sintered Nd-Fe-B permanent magnetic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The NdFeB quick-setting sheet is made by the quick-setting process, and its composition is Nd 31.5 co 1.2 B 0.95 Cu 0.04 Fe 66.31 .

[0026] (2) Using a high-energy ball mill, the heavy rare earth compound DyF 3 Ball milled to less than 1 μm. Use high-purity alcohol such as analytical pure alcohol as a protective medium during the ball milling process, and the ball milling time is 30-60 minutes.

[0027] (3) Put the prepared quick-setting sheet into 3% (volume ratio) nitric acid alcohol solution and perform ultra-cleaning for 2 minutes to remove surface oxide scales and impurity substances, and carry out grain boundary corrosion simultaneously.

[0028] (4) Configure DyF with high-purity alcohol such as analytical pure alcohol 3 Suspension, the mass percentage of the solution is 1%, put the quick-setting sheet after grain boundary corrosion into the suspension, and carry out ultrasonic coating for 15 minutes, so that the surface is evenly coated with a layer ...

Embodiment 2

[0034] (1) The NdFeB quick-setting sheet is made by the quick-setting process, and its composition is Nd 30.5 co 1.2 B 0.95 Cu 0.04 Fe 67.31 .

[0035] (2) Using a high-energy ball mill, the heavy rare earth compound TbH x(Hydrogen-absorbing compounds of terbium) ball milled to less than 1 μm. Use high-purity alcohol such as analytical pure alcohol as a protective medium during the ball milling process, and the ball milling time is 30-60 minutes.

[0036] (3) Put the prepared quick-setting sheet into 3% (volume ratio) nitric acid alcohol solution and perform ultra-cleaning for 2 minutes to remove surface oxide scales and impurity substances, and carry out grain boundary corrosion simultaneously.

[0037] (4) Configure TbH with analytical pure alcohol x Suspension solution, the mass percentage of the solution is 1%. Put the quick-setting tablet after grain boundary corrosion into the suspension solution, and perform ultrasonic coating for 15 minutes, so that the surface ...

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Abstract

The invention relates to a method for improving performance of sintered Nd-Fe-B permanent magnetic property by a rapid-hardening flake grain boundary diffusion heavy rare earth compound in rare earth material technical field, which comprises the following steps: 1) rapid-hardening technology is adopted to prepare an Nd-Fe-B alloy rapid-hardening flake; 2) a high-energy ball mill is used to prepare the heavy rare earth compound into powder particles with diameter being smaller than 1mu m; 3) the rapid-hardening flake is put into heavy rare earth compound turbid liquid to carry out ultrasonic coating; 4) the coated rapid-hardening flake is put into a sintered furnace filled with Ar2 to carry out positive pressure thermal diffusion; 5) ball milling, powder processing, orientation shaping, isostatic pressing and vacuum sintering are adopted to prepare the strip-casting flake after the heat treatment into a magnet. The chemical formula of the Nd-Fe-B permanent magnetic material is NdxFe(100-x-y-z-xl)ByCozCuxl, and the mass percent is as follows: x is 30-31.5, y is 0.95-1, z is 1-1.2, and xl is 0-0.06. The magnet prepared by the invention improves the intrinsic coercivity on the basis of keeping the current magnetic energy product.

Description

technical field [0001] The invention relates to a method for improving the performance of sintered NdFeB permanent magnets by diffusing a heavy rare earth compound at the grain boundary of a quick-setting sheet in the technical field of rare earth materials. Background technique [0002] As the third generation of rare earth permanent magnet materials, NdFeB rare earth permanent magnet materials have been commercialized and developed by Sumitomo Metal of Japan and GM of the United States in 1983. Due to the characteristics of high remanence, high coercive force and high magnetic energy product , are widely used in power electronics, communications, information, motors, transportation, office automation, medical equipment, military and other fields, and make it possible to apply some small, highly integrated high-tech products, such as voice coil motors for hard disks (VCM ), hybrid electric vehicles (HEV), electric vehicles, etc. To meet the above market demands, we need to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F1/02B22F3/16B22F9/04
Inventor 丁勇陈仁杰闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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