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Neodymium iron boron material and preparation method and application thereof

A technology of permanent magnet material and content, applied in magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve problems such as poor consistency and deterioration of magnet performance

Active Publication Date: 2020-06-05
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

[0006] The technical problem to be solved by the present invention is to overcome the defects in the prior art that when B<5.88at% in the R-T-B system magnet, the magnet performance is deteriorated and the consistency is poor, and to provide a neodymium-iron-boron material and its preparation method and application

Method used

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  • Neodymium iron boron material and preparation method and application thereof
  • Neodymium iron boron material and preparation method and application thereof
  • Neodymium iron boron material and preparation method and application thereof

Examples

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Embodiment 1

[0081] The raw materials used in the preparation of the R-T-B series permanent magnet material in this embodiment are shown in Table 1. The preparation process is as follows:

[0082] (1) Smelting: According to the formula shown in Table 1, take the prepared raw materials and put them in a crucible made of alumina, and carry out in a high-frequency vacuum induction melting furnace at a temperature of 1500℃ under the condition of a vacuum of less than 0.02Pa Vacuum melting.

[0083] (2) Casting: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 55,000 Pa, and then the casting is carried out. The molten liquid is passed through a copper roller with a rotation speed of 29 rpm to obtain a rapid solidification thickness of 0.12-0.35 mm. For alloy flakes, during the casting process, the copper roller needs to be fed with chilled water, and its inlet temperature is ≤25℃; 2 ℃ / sec-10 4 The cooling rate of °C / sec obtains a quenched alloy.

[0084]...

Embodiment 2～26、 comparative example 1～11

[0101] The raw materials were prepared according to the formula shown in Table 1, and except for the conditions shown in Table 2, the other process conditions were the same as those in Example 1, and the R-T-B series permanent magnetic material was prepared.

Embodiment 27～30

[0103] The raw materials of Examples 27-30 are the same as those of Example 22, except for the conditions shown in Table 2, the other process conditions are the same as those of Example 22, to obtain R-T-B series sintered magnets.

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Abstract

The invention discloses a neodymium iron boron material and a preparation method and application thereof, the neodymium iron boron material comprises R, Cu, Al, Fe and B, and also comprises one or more of Ti, Zr and Nb, the content of R is 28.5-33.2% by weight, the content of Zr is 23.5-33.2% by weight, and the content of Nb is 23.5-33.2% by weight. The content of Cu is more than 0.393%; the content of B is 0.84 to 0.945 percent; wherein the content of Al is less than 0.08%; the R-T-B series permanent magnet material does not contain Co; the R-T-B series permanent magnet material comprises anR2Fe14B main phase, a grain boundary phase and a rare earth-rich phase. The grain boundary phase comprises R < 6 > Fe < 13 > Cu; and the volume fraction of R6Fe13Cu is greater than or equal to 3.5%. The neodymium iron boron material is high in coercive force Hcj and Br, good in magnet temperature stability and excellent in performance; and the demagnetization curve has no step, the relative permeability is low, and the uniformity of the magnetic steel is good.

Description

Technical field [0001] The invention relates to a neodymium iron boron material and its preparation method and application. Background technique [0002] RTB series sintered magnets (R refers to rare earth elements, T refers to transition metal elements and metal elements of the third main group, B refers to boron element) is currently the most used rare earth permanent magnet material, which is widely used in electronics, electrical machinery, and medical equipment , Toys, packaging, hardware machinery, aerospace and other fields, the more common ones are permanent magnet motors, speakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment and meters. [0003] In the experiment, it was found that when the B content is high, more B-rich phases will be generated, which will affect the remanence performance of the product. Therefore, in order to increase the remanence of R-T-B sintered magnets, it is usually necessary to reduce the B content, but when th...

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 付刚胡季帆陈大崑黄清芳黄佳莹许德钦
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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