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Neodymium iron boron material and preparation method and application thereof

A technology of NdFeB and permanent magnet materials, applied in magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of low coercive force, reduced coercive force, shortening the processing cycle of NdFeO alloy sheets, etc. problems, achieve high coercive force, prevent excessively small crystal grains, and achieve the effects of excellent physical and chemical properties

Inactive Publication Date: 2020-09-11
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method will still lead to low coercivity when preparing NdFeB alloy sheets with total rare earth RE<30.5%.
[0004] Chinese patent CN201710305563.5 also discloses a preparation method for Nd-Iron ore alloy flakes, which shortens the processing cycle of Nd-Iron ore alloy flakes by controlling the water inlet temperature of the copper roller, the cooling temperature, the cooling roller speed and other conditions during the casting stage. The manufacturing cost is reduced, but the reduction of the coercive force cannot be completely avoided by the NdFeB alloy sheet with the total amount of rare earth RE<30.5% only through the above method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) charging: the composition 29.8%PrNd, 0.5%Al, 0.2%Cu, 1%Co, 0.2%Zr, 0.25%Ga, 0.1%Ti, 0.98%B, the rest are raw materials including pure iron (praseodymium Neodymium accounts for 29.8%) into the crucible.

[0062] (2) Vacuuming: Vacuum the furnace to make the vacuum degree reach 15-18Pa, then heat and continue to vacuumize to 8-9Pa under the premise that the raw material will not turn red when heated.

[0063] (3) Oxygenation: Fill the furnace with high-purity oxygen with a purity≤99.99%, and stop the oxygenation after the gas pressure in the furnace reaches 50kPa.

[0064] (4) Melting: All solid raw materials are melted into liquid by induction heating.

[0065] (5) Refining: Continue heating and use electromagnetic stirring to fully mix and react the liquid metals, and raise the temperature of the alloy liquid to 1500°C.

[0066] (6) Isostatic: adjust to an appropriate heating power, and keep the alloy liquid at 1500°C for 3 to 5 minutes.

[0067] (7) Cooling: Aft...

Embodiment 2

[0078] (1) Charge: raw materials including 29.5% PrNd, 0.5% Al, 0.2% Cu, 1.5% Co, 0.2% Zr, 0.25% Ga, 0.95% B, and the rest are pure iron (praseodymium and neodymium account for 29.5% %) into the crucible.

[0079] (2) Vacuuming: Vacuum the furnace to make the vacuum degree reach 15-18Pa, then heat and continue to vacuumize to 8-9Pa under the premise that the raw material will not turn red when heated.

[0080] (3) Oxygenation: Fill the furnace with high-purity oxygen with a purity≤99.99%, and stop the oxygenation after the gas pressure in the furnace reaches 50kPa.

[0081] (4) Melting: All solid raw materials are melted into liquid by induction heating.

[0082] (5) Refining: Continue heating and use electromagnetic stirring to fully mix and react the liquid metals, and raise the temperature of the alloy liquid to 1500°C.

[0083] (6) Isostatic: adjust to an appropriate heating power, and keep the alloy liquid at 1500°C for 3 to 5 minutes.

[0084] (7) Cooling: After turni...

Embodiment 3

[0095] (1) Charge: raw materials including 29.5% PrNd, 0.5% Al, 0.2% Cu, 1.5% Co, 0.2% Zr, 0.25% Ga, 0.95% B, and the rest are pure iron (praseodymium and neodymium account for 29.5% %) into the crucible.

[0096] (2) Vacuuming: Vacuum the furnace to make the vacuum degree reach 15-18Pa, then heat and continue to vacuumize to 8-9Pa under the premise that the raw material will not turn red when heated.

[0097] (3) Oxygenation: Fill the furnace with high-purity oxygen with a purity≤99.99%, and stop the oxygenation after the gas pressure in the furnace reaches 50kPa.

[0098] (4) Melting: All solid raw materials are melted into liquid by induction heating.

[0099] (5) Refining: Continue heating and use electromagnetic stirring to fully mix and react the liquid metals, and raise the temperature of the alloy liquid to 1500°C.

[0100] (6) Isostatic: adjust to an appropriate heating power, and keep the alloy liquid at 1500°C for 3 to 5 minutes.

[0101] (7) Cooling: After turni...

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Abstract

The invention discloses a neodymium iron boron material, and a preparation method and application thereof. The preparation method of a neodymium-iron-boron alloy sheet comprises the steps that a liquid alloy liquid is poured on a ground cooling roller, and the liquid alloy liquid is cooled to form the neodymium-iron-boron alloy sheet, wherein the rotating speed of the cooling roller is 27-32 r / min, and the temperature of a cooling liquid in the cooling roller is -2 DEG C - 15 DEG C; and an air pipe is arranged above the cooling roller, and the cooling roller is subjected to air injection cooling through the air pipe. According to the preparation method of the neodymium-iron-boron alloy sheet, the coercivity can be effectively improved, and the prepared neodymium-iron-boron alloy sheet hasexcellent physical and chemical properties.

Description

technical field [0001] The invention relates to a neodymium iron boron material, its preparation method and application. Background technique [0002] When the total RE of NdFeB alloy sheet is less than 31.5%, the current method can reduce the reduction of coercive force to a certain extent, but in high-grade products, especially in RE≤30.5%, the current process is prone to coercive force deviation. low case. [0003] Chinese patent CN201610650925.X discloses a preparation method of NdFeB alloy flakes. In the casting stage, the alloy is cast by controlling the temperature of the water entering the quenching roll at 17-19°C, and grinding the quenching roll. , alloy flakes with lower oxygen content and better crystal shape were obtained. However, the above methods still lead to low coercive force when preparing NdFeB alloy sheets with total rare earth RE<30.5%. [0004] Chinese patent CN201710305563.5 also discloses a method for preparing Nd-Iron ore alloy flakes, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/06B22D11/18C22C38/06C22C38/10C22C38/14C22C38/16H01F1/057H01F41/02
CPCB22D11/0611B22D11/0682B22D11/0665C22C38/005C22C38/06C22C38/16C22C38/10C22C38/14C22C38/002B22D11/18H01F1/057H01F41/0253
Inventor 黄杰华李智翔孔维峰兰文辉
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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