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Method for recycling superfine powder of sintered NdFeB material

A neodymium-iron-boron and ultra-fine powder technology, applied in magnetic materials, magnetic objects, electrical components, etc., can solve the problems of increased powder risk, small particle size of ultra-fine powder, high oxidation sensitivity, etc., and achieve energy saving , The effect of reducing volatilization and burning loss, and reducing costs

Active Publication Date: 2017-12-01
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the particle size of the ultrafine powder is too small and the oxidation sensitivity is too high, the fluctuation of the final magnetic properties of the magnet will increase, and the risk of powder fire will increase.

Method used

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  • Method for recycling superfine powder of sintered NdFeB material
  • Method for recycling superfine powder of sintered NdFeB material
  • Method for recycling superfine powder of sintered NdFeB material

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preparation example Construction

[0029] In step 2, the new raw materials for preparing NdFeB materials added with the superfine powder are placed in a vacuum smelting furnace, and the metal is melted by medium frequency induction heating, wherein the refining temperature is 1450-1460 °C, and the casting temperature is 1450-1460 °C, Then, a flake NdFeB alloy is made, and then the NdFeB alloy is made into powder for preparing a NdFeB material.

[0030] In one embodiment of the present invention, preferably, in the method for reusing the ultrafine powder of sintered NdFeB material, in the second step, the sheet-shaped NdFeB alloy is used to prepare NdFeB. The powder of the material, including the following steps:

[0031] First, the flake NdFeB alloy is put into a hydrogen blast furnace, and hydrogen is introduced to carry out a hydrogen absorption reaction and burst into loose powder of 30-300 μm;

[0032] Then carry out the dehydrogenation reaction to obtain the intermediate powder whose surface is uniformly ...

Embodiment 1

[0044] According to the example in Table 1, according to the ratio of adding ultrafine powder 15%, only 510kg of raw materials need to be provided for smelting 600kg, and 510kg of raw materials prepared according to the original formula [among which the iron rods should be derusted, and the rare earth materials should be free of oil, moisture and Rust] and 90kg of sample ultrafine powder are added to the vacuum melting furnace, the medium frequency induction heating melts the metal, the refining temperature is 1450-1455 ° C, the casting temperature is 1450-1455 ° C, and then poured into the rotating water-cooled cooling roll through the tundish, the speed is 38-42rpm Finally, a flaky fast-quenched NdFeB alloy with a columnar crystal structure is obtained, the ratio of the flaked columnar crystal is more than 95%, and the thickness is 0.15-0.45mm, and the qualified flake NdFeB alloy is put into a hydrogen blast furnace, When hydrogen is introduced, the hydrogen will react strong...

Embodiment 2

[0055] According to the example in Table 4, according to the ratio of adding superfine powder 10%, only 540kg of raw materials need to be provided for smelting 600kg, and 540kg of raw materials prepared according to the original formula [among which the iron rods need to be derusted, and the rare earth materials should be free of oil, moisture and no Rust] and 60kg of superfine powder are added to the vacuum melting furnace, and the metal is melted by medium frequency induction heating. The refining temperature is 1455-1458 ° C, the pouring temperature is 1455-1458 ° C, and then poured into the rotating water-cooled cooling roll through the tundish, and the speed is 38-42rpm. Finally, a rapidly quenched NdFeB alloy with a columnar crystal structure is obtained in the form of flakes. The proportion of flakes and columnar crystals is more than 95%, and the thickness is 0.15-0.45mm. Strong hydrogen absorption reaction with Nd-rich phase and main phase to generate Nd with large lat...

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Abstract

The invention discloses a method for recycling superfine powder of a sintered NdFeB material. The method comprises the following steps of step 1, adding the superfine powder to a raw material for preparing the NdFeB material so as to replace part of the raw material for preparing the NdFeB material, and forming a new raw material for preparing the NdFeB material, wherein the added proportion of the superfine powder is not more than 15 % of the original weight of the raw material, and the superfine powder is powder which is produced by jet milling of a fluidized bed and has a particle size of not more than 1mum; step 2, putting the new raw material in a vacuum melting furnace, and melting metals through medium frequency induction heating, wherein the refining temperature is 1450-1460 DEG C, and the casting temperature is 1450-1460 DEG C; obtaining sheet-like NdFeB alloy, and turning the alloy into powder for preparing the NdFeB material. According to the method, the coercive force and the remanence of a magnet are high, and the high coercive force and remanence are very important to the high-temperature characteristic and the magnetic flux of the magnet; the refining temperature and the casting temperature are lower than the refining temperature and the casting temperature of the prior art, and therefore the method can save energy, reduce the loss of volatilization and burning of the rare earth and reduce the cost.

Description

technical field [0001] The invention relates to a method for reusing ultrafine powder of sintered neodymium iron boron material. Background technique [0002] The working principle of fluidized bed jet mill: compressed nitrogen is accelerated into supersonic air flow through Laval nozzle to drive the material to fly at high speed and collide with each other in the grinding area, so as to achieve the purpose of pulverization; after the air flow expands, the collided material rises and enters the classification In the grading area, it is sorted out by the turbine-type grouping wheel, and is brought out with the airflow into the cyclone separator for separation; it is separated into three kinds of powder, the first one is the powder with a particle size (2.5-6μm), which is separated out and stored. into the powder tank; the second is coarse powder, which is then returned to the grinding area with the airflow to continue grinding until it reaches the particle size and is separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057B02C19/06B22F3/04B22F3/10
CPCB02C19/068B22F3/04B22F3/1007H01F1/0573
Inventor 刘润海刘月玲
Owner 京磁材料科技股份有限公司
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