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A preparation process of nanocrystallineNdFeB magnet

A preparation process, NdFeB technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of less utilization and low utilization rate, reduce the cost of magnets, increase the coercive force, avoid The effect of wasting rare earth resources

Active Publication Date: 2018-12-11
江苏润联再生资源科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems that various low-abundance rare earth elements such as Pr, Tb and Dy are used in large quantities in the preparation of existing NdFeB magnets, while high-abundance rare earth elements such as La and Ce are rarely utilized or the utilization rate is low, etc., the present invention Provides a preparation process for nanocrystalline NdFeB magnets, through the effective use of high-abundance rare earth elements such as La, Ce and Y, to prepare high-abundance rare earth element-based compounds such as La / Ce-based compounds, and at the same time make it in the matrix material The permanent magnetic performance of NdFeB magnets is greatly enhanced by in-situ diffusion

Method used

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  • A preparation process of nanocrystallineNdFeB magnet

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Embodiment 1

[0033] A preparation process for a nanocrystalline NdFeB magnet, the preparation process comprising the following preparation steps:

[0034] 1) Mix the raw material HRE 100-y-x LRE x m y Placed in a smelting furnace, its mass composition is 95.8% La (HRE) and 4% Al (M), and the atomic percentage is La 82 al 18 , evacuated to 3×10 -3 Pa, then clean the furnace cavity with high-purity argon, then use high-purity argon to pressurize to 0.08MPa, make the mixed raw materials undergo argon arc melting under the protection of argon, and melt for 1 minute each time, turn over after melting, and repeat 8 times, cooling to obtain a master alloy with uniform composition;

[0035] 2) Break the master alloy obtained in step 1), and put it into a quartz tube with a small hole at the lower end in 8×10 -4 Under the condition of Pa, carry out vacuum stripping, fill the pressure difference of 0.05MPa, use high-frequency induction heating to melt the master alloy fragments and blow them, ...

Embodiment 2

[0040] A preparation process for a nanocrystalline NdFeB magnet, the preparation process comprising the following preparation steps:

[0041] 1) Mix the raw material HRE 100-y-x LRE x m y Placed in a smelting furnace, its mass composition is 81% Ce (HRE), 11% Y (HRE), 0.4% Pr (LRE), 0.9% Dy (LRE) and 6.7% Cu (M), vacuumize to 7 ×10 -3 Pa, then clean the furnace chamber with high-purity argon, then use high-purity argon to pressurize to 0.13MPa, make the mixed raw materials undergo argon arc melting under the protection of argon, each melting for 3 minutes, turn over after melting, repeat 3 times, cooling to obtain a master alloy with uniform composition;

[0042] 2) Break the master alloy obtained in step 1), and put it into a quartz tube with a small hole at the lower end of 1.3×10 -4 Under the condition of Pa, vacuumize the strip, fill it with a pressure difference of 0.1MPa, use high-frequency induction heating to melt the master alloy fragments and start blowing, and ...

Embodiment 3

[0047] A preparation process for a nanocrystalline NdFeB magnet, the preparation process comprising the following preparation steps:

[0048] 1) Mix the raw material HRE 100-y-x LRE x m y Placed in a smelting furnace, its mass composition is 13.5% La (HRE), 21% Ce (HRE), 42% Nd (LRE), 11% Y (LRE), 8.5% Ga (M) and 4% Al ( M), vacuumize to 5×10 -3 Pa, then clean the furnace chamber with high-purity argon, then use high-purity argon to pressurize to 0.1MPa, make the mixed raw materials carry out argon arc melting under the protection of argon, smelting for 3 minutes each time, turn over after melting, repeat 5 times, cooling to obtain a master alloy with uniform composition;

[0049] 2) Break the master alloy obtained in step 1), and put it into a quartz tube with a small hole at the lower end at 1×10 -4 Under the condition of Pa, vacuumize the strip, fill it with a pressure difference of 0.09MPa, use high-frequency induction heating to melt the master alloy fragments and bl...

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Abstract

The invention relates to the field of magnet preparation, in particular to a preparation process of a nanocrystallineNd-Fe-B magnet with high efficiency and high abundance of rare earth elements, which mainly comprises the following steps of: 1) smelting a master alloy with uniform composition; 2) that parent alloy is crushed and the strip is prepared by a tape-throwing proces, and the strip is crushed into additive powder again; 3) mix that additive powder and the MQ pow to prepare an isotropic magnet; 4) that nanocrystallineNdFeB magnet is prepare by hot pressing, wherein the high-abundancerare earth element-based compound such as La / Ce-based compound is prepared by effectively utilizing the high-abundance rare earth elements such as La, Ce and Y, and the permanent magnet performance ofthe NdFeB magnet is greatly improved by in-situ diffusion in the matrix material.

Description

technical field [0001] The invention relates to the field of magnet preparation, in particular to a preparation process of a nanocrystalline neodymium-iron-boron magnet that efficiently utilizes high-abundance rare earth elements. Background technique [0002] Rare earth permanent magnet materials are key functional materials for the development of emerging industries and the implementation of "Made in China 2025", and are widely used in new energy, smart equipment, rail transit, electronic information and other fields. At present, NdFeB magnets occupy a dominant position in rare earth permanent magnet materials. With the rapid development of the rare earth permanent magnet motor industry, the demand for NdFeB magnets has increased significantly, and the usage and price of rare earth metals such as praseodymium and neodymium have also continued to rise. Rare earth elements mainly exist in the form of associated minerals in the earth's crust, among which lanthanum La and cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0045H01F1/0576H01F41/0266H01F41/0293
Inventor 赵利忠李成利刘仲武李领伟
Owner 江苏润联再生资源科技有限公司