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Neodymium-iron-boron magnet coarse powder auxiliary agent, preparation method and application thereof and preparation method of magnet

A technology of neodymium iron boron and magnets, which is applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc.

Pending Publication Date: 2021-10-29
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there have been no reports of adding heavy rare earth elements in the grinding stage to increase the coercive force of magnets.

Method used

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  • Neodymium-iron-boron magnet coarse powder auxiliary agent, preparation method and application thereof and preparation method of magnet
  • Neodymium-iron-boron magnet coarse powder auxiliary agent, preparation method and application thereof and preparation method of magnet
  • Neodymium-iron-boron magnet coarse powder auxiliary agent, preparation method and application thereof and preparation method of magnet

Examples

Experimental program
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Effect test

preparation example Construction

[0052]

[0053] The preparation method of the above-mentioned NdFeB magnet coarse powder additive is introduced below. Ultrasonic dispersion of raw materials including boric acid, boric acid ester and substances containing heavy rare earth elements to obtain coarse powder additives for NdFeB magnets. According to one embodiment of the present invention, raw materials including boric acid, boric acid ester, substances containing heavy rare earth elements, and alkyl alcohol, alkyl ether or petroleum ether as a solvent are ultrasonically dispersed to obtain coarse powder additives for NdFeB magnets. According to one embodiment of the present invention, raw materials including boric acid, boric acid ester, substances containing heavy rare earth elements, oxime compounds, and alkyl alcohol, alkyl ether or petroleum ether as solvents are ultrasonically dispersed to obtain rough NdFeB magnets. powder additives. The type and amount of boric acid, borate ester, substance containing ...

preparation example 1～4 and preparation comparative example 1～2

[0091] The composition of NdFeB magnet coarse powder additives is shown in Table 1. Weigh raw materials according to the composition of NdFeB magnet coarse powder additives shown in Table 1; mix the raw materials to form a mixture; ultrasonically disperse the mixture for 30 minutes to form a stable suspension, which is NdFeB magnet coarse powder additives.

[0092] Table 1

[0093] serial number Preparation Example 1 Preparation example 2 Preparation example 3 Preparation Example 4 Preparation of Comparative Example 1 Preparation of Comparative Example 2 TbF 3

[0094] Note: The amount of the above raw materials is based on 1g of NdFeB magnet coarse powder additive. TbF 3 and DyF 3 the D 50 3 to 5 μm.

Embodiment 1～4 and comparative example 1～2

[0096] A magnet-forming raw material composed of 30wt% Nd, 0.5wt% Al, 0.72wt% Co, 0.1wt% Cu, 0.17wt% Zr, 0.94wt% B and the balance Fe was prepared.

[0097] Place the raw materials for forming magnets in a vacuum intermediate frequency quick-setting induction furnace, evacuate below 1Pa, preheat, evacuate again to below 1Pa; fill with argon to 0.05MPa, then melt at 1480°C, and pour the alloy melt On a rotating cooled copper roll, alloy flakes with an average thickness of 0.3 mm were obtained.

[0098] Place the alloy flakes in a hydrogen crushing furnace and crush them into an average particle size D under 0.08MPa hydrogen 50 Coarse powder of 300μm NdFeB magnet.

[0099] Add the NdFeB magnet coarse powder additive to the NdFeB magnet coarse powder, place the mixture in a 3D mixer for 2 hours, and then crush the NdFeB magnet coarse powder into an average particle size of D 50 3.0μm NdFeB magnet fine powder.

[0100] The NdFeB magnet fine powder is pressed into a green body o...

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Abstract

The invention discloses a neodymium-iron-boron magnet coarse powder additive, a preparation method and application of the neodymium-iron-boron magnet coarse powder additive and a preparation method of a magnet. On the basis of 1 g of the neodymium-iron-boron magnet coarse powder auxiliary agent, the neodymium-iron-boron magnet coarse powder auxiliary agent contains 0.01-0.1 g of boric acid, 0.001-0.1 ml of boric acid ester and 0.1-0.85 g of substances containing heavy rare earth elements; the substance containing the heavy rare earth element is selected from one or more of a heavy rare earth metal simple substance, a heavy rare earth metal hydride or a heavy rare earth metal halide. The neodymium-iron-boron magnet coarse powder additive can improve the intrinsic coercive force of a neodymium-iron-boron magnet, and residual magnetism is not reduced.

Description

technical field [0001] The invention relates to a coarse powder additive for NdFeB magnets, a preparation method and application thereof, and also a preparation method for magnets. Background technique [0002] As a basic functional material, NdFeB magnets are widely used in electric vehicles, hybrid vehicles, wind power generation, inverter air conditioners, medical equipment, elevators, audio equipment, and mineral sorting due to their excellent magnetic properties. With the accelerated development of science and technology and "low-carbon economy", new requirements have been put forward for NdFeB magnets in fields such as hybrid vehicles, wind power generation, and inverter air conditioners, that is, NdFeB magnets are required to provide higher remanence and coercivity. Force, in order to provide enough magnetic energy storage, while ensuring the normal operation of the product at high temperatures. [0003] In order to improve the remanence and coercivity of NdFeB magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 张帅吴树杰马建永张永虎赵永刚董义袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD