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Sintered NdFeB magnet and manufacturing method thereof

A manufacturing method and technology for magnets, which are applied to magnetic objects, magnetic materials, permanent magnets, etc., can solve problems such as the influence of the use range of magnets, and achieve the effect of high coercivity.

Active Publication Date: 2012-07-18
SANVAC BEIJING MAGNETICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the characteristics of NdFeB material, in the past technology, if the coercive force Hcj of the magnet is to be increased, the remanence Br of the magnet will be affected; if the remanence Br of the magnet is to be increased, the coercive force Hcj of the magnet will be affected Therefore, the magnet has a higher Hcj but cannot have a higher magnetic energy product (BH)max at the same time, which affects the use range of the magnet to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, make the ingredients according to the table below.

[0024] raw material

[0025] Put the raw materials into a vacuum quick-setting furnace for smelting. After smelting, cast and throw the strips. The thickness of the obtained strips ranges from 0.1 to 0.5mm. Put the above alloys into the hydrogenation furnace for hydrogen crushing treatment. The strips after hydrogen treatment The micropowder is prepared in a jet mill, and the average particle size of the obtained micropowder is controlled at 2.8 μm. The powder is mixed in a container filled with nitrogen, and then compressed in a closed nitrogen-filled press, and the packaged blank is placed in an isostatic press. The press is pressed under a pressure of 170MPa; the pressed blank enters a vacuum sintering furnace for sintering under the protection of a nitrogen atmosphere, the sintering temperature is 1045°C, and the sintering time is 5 hours, and then filled with Ar gas to cool the sintering furnace t...

Embodiment 2

[0027] Make ingredients according to the table below.

[0028] raw material

[0029] Put the raw materials into a vacuum quick-setting furnace for smelting. After smelting, cast and throw the strips. The thickness of the obtained strips is 0.1-0.5mm. Put the above alloys into the hydrogenation furnace for hydrogen crushing treatment. The strips after hydrogen treatment are in The micropowder is prepared in a jet mill, and the average particle size of the obtained micropowder is controlled at 3.0 μm. The powder is mixed in a container filled with nitrogen, and then compressed in a closed press filled with nitrogen, and the packaged blank is placed in an isostatic press. Pressed under the pressure of 180MPa; the pressed blank enters the vacuum sintering furnace for sintering under the protection of nitrogen atmosphere, the sintering temperature is 1055 ° C, the sintering time is 4 hours, and then filled with Ar gas to cool the sintering furnace to below 100 ° C (80 ℃),...

Embodiment 3

[0031] Make ingredients according to the table below.

[0032] raw material

[0033] Put the raw materials into a vacuum quick-setting furnace for smelting. After smelting, cast and throw the strips. The thickness of the obtained strips is 0.1-0.5mm. Put the above alloys into the hydrogenation furnace for hydrogen crushing treatment. The strips after hydrogen treatment are in Micropowder preparation is carried out in a jet mill, and the average particle size of the obtained micropowder is controlled between 3.2 μm. The powder is mixed in a container filled with nitrogen and then compressed in a closed nitrogen-filled press. The packaged blank is placed in an isostatic The press is pressed under a pressure of 190MPa; the pressed blank is sintered in a vacuum sintering furnace under the protection of a nitrogen atmosphere. 80°C), then heated up to 920°C and held for 4.5 hours, then filled with Ar gas to cool the sintering furnace to below 100°C (about 80°C), then raise...

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Abstract

The invention discloses a sintered NdFeB magnet and a manufacturing method of the sintered NdFeB magnet; the sintered NdFeB magnet comprises the following components: 27.3-27.8wt% of Nd and Pr, 1.0-1.8wt% of Tb, 0.1-0.4wt% of A1, 0.08-0.14wt% of Cu, 0-2wt% of Co, 0-0.14wt% of Ga, 0.93-1.0wt% of B and the balance of Fe, wherein the (BH) max of the magnet is greater than 47 MGOe, and the Hcj of the magnet is greater than 16kOe. The manufacturing method of the sintered NdFeB magnet comprises the following steps of: burdening; smelting in a vacuum sensing rapid hardening furnace to obtain a strip-casting alloy sheet; hydrogenating to crush the strip-casting alloy sheet and preparing into micro powder in an air-stream mill; mixing the obtained micro powder; compressing the mixed micro powder into a blank; placing the blank into a vacuum sintering furnace for sintering after carrying out isostatic pressing; and carrying out secondary aging after the sintering to obtain the magnet. In the invention, through accurately designing the burdening and technological parameters of the sintered NdFeB magnet, magnets with high coercive force and high magnetic energy product can be produced in batch, and the (BH) max is greater than 47 MGEo, and the Hcj is greater than 16 KOe.

Description

technical field [0001] The invention relates to a sintered NdFeB magnet and its manufacturing method, especially a high-performance sintered NdFeB magnet and its manufacturing method, especially a sintered NdFeB magnet with (BH)max>47MGOe, Hcj>16kOe and its manufacturing method. Background technique [0002] Permanent magnetic materials have been developed as key materials supporting electronic devices, and the development direction is toward the direction of high magnetic energy product and high coercive force. At present, rare earth magnets are widely used in many fields, such as recent walking robots with mechanical minds, special motors with integrated technology supported by rare earth NdFeB magnets, and automotive automatic systems have become new application fields. How to improve Br and Hcj has become the development trend of NdFeB magnets. [0003] Due to the characteristics of NdFeB material, in the past technology, if the coercive force Hcj of the magnet is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F7/02C22C28/00C22C33/02
Inventor 赵玉刚张瑾胡伯平饶晓雷杨雁
Owner SANVAC BEIJING MAGNETICS
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