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Neodymium-iron-boron magnet material, raw material composition, preparation method and application

A raw material composition, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc. The remanence cannot be significantly improved, and the coercive force is significantly improved, etc.

Active Publication Date: 2020-04-03
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

[0003] The technical problem to be solved by the present invention is to overcome the defect that the coercivity and remanence of the magnet material still cannot be significantly improved after replacing neodymium with part of praseodymium in the prior art.
The NdFeB magnet material in the present invention increases the content of praseodymium and gallium at the same time, which can overcome the defect in the prior art that increasing high praseodymium or high gallium alone still cannot significantly improve the coercive force, and the present invention does not add Under the premise of heavy rare earth elements, the obtained NdFeB magnet materials have high remanence and coercive force

Method used

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  • Neodymium-iron-boron magnet material, raw material composition, preparation method and application
  • Neodymium-iron-boron magnet material, raw material composition, preparation method and application
  • Neodymium-iron-boron magnet material, raw material composition, preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0127] The preparation method of NdFeB magnet material is as follows:

[0128] (1) Melting and casting process: According to the formula shown in Table 1, take the prepared raw materials and put them in the crucible made of alumina, and put them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa. Ar gas is introduced into the melting furnace after vacuum melting to make the pressure reach 5.5×10 4 After Pa, cast to 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.

[0129] (2) Hydrogen crushing process: Vacuumize the smelting furnace where the quenched alloy is placed at room temperature, and then pass hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. After fully absorbing hydrogen, pump it The temperature was raised under vacuum to fully dehydrogenate, and then cooled, and the hydrogen crushed powder was ...

Embodiment 53

[0135] Embodiment 53 adopts Dy grain boundary diffusion method

[0136] The raw material composition of Example 1 in Table 1 was prepared according to the preparation of the sintered body of Example 1 first to obtain a sintered body, followed by grain boundary diffusion and aging treatment. Wherein the technology of aging treatment is the same as embodiment 1, and the processing process of grain boundary diffusion is as follows:

[0137] The sintered body is processed into a magnet with a diameter of 20mm and a sheet thickness of less than 3mm. The thickness direction is the orientation direction of the magnetic field. After the surface is cleaned, the raw material made of Dy fluoride is used to spray and coat the magnet on the whole surface. The magnet is dried, and the metal with Tb element is sputtered on the surface of the magnet in a high-purity Ar gas atmosphere, and the temperature of 850°C is diffused and heat-treated for 24 hours. Cool to room temperature.

Embodiment 54

[0138] Embodiment 54 adopts Tb grain boundary diffusion method

[0139] The number 1 in Table 1 is prepared according to the preparation of the sintered body of Example 1 firstly to obtain the sintered body, and the grain boundary diffusion is performed first, and then the aging treatment is performed. Wherein the technology of aging treatment is the same as embodiment 1, and the processing process of grain boundary diffusion is as follows:

[0140] Process the sintered body into a magnet with a diameter of 20mm and a sheet thickness of less than 7mm. The direction of thickness is the orientation direction of the magnetic field. The magnet is dried, and the metal with Tb element is sputtered on the surface of the magnet in a high-purity Ar gas atmosphere, and the temperature of 850°C is diffused and heat-treated for 24 hours. Cool to room temperature.

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Abstract

The invention discloses a neodymium-iron-boron magnet material, a raw material composition, a preparation method and application. The raw material composition of the neodymium-iron-boron magnet material is prepared from the following components in percentage by mass: 29.5 to 32 percent of R' which is a rare earth element and comprises Pr and Nd, wherein Pr is greater than or equal to 17.15%; 0.25to 1.05 percent of Ga; 0.9 to 1.2 percent of B; and 64 to 69 percent of Fe. According to the neodymium-iron-boron magnet material disclosed by the invention, on the premise of not adding heavy rare earth elements, the residual magnetism and coercive force of the obtained neodymium-iron-boron magnet material are relatively high.

Description

technical field [0001] The invention specifically relates to a neodymium-iron-boron magnet material, a raw material composition, a preparation method and an application. Background technique [0002] Take Nd 2 Fe 14 Neodymium-iron-boron (NdFeB) magnet material with B as the main component has high remanence, coercive force and maximum magnetic energy product, and excellent comprehensive magnetic properties. It is used in wind power generation, new energy vehicles, and frequency conversion home appliances. The rare earth components in the current NdFeB magnet materials in the prior art are usually mainly neodymium, with only a small amount of praseodymium. Although there are a few reports in the prior art that substituting part of praseodymium for neodymium can improve the performance of magnet materials, the degree of improvement is limited and there is still no significant improvement, and more expensive heavy rare earth elements need to be added. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266H01F41/0293C22C38/005C22C38/16C22C38/02C22C38/14C22C38/10C22C38/04C22C38/002C22C38/12C22C33/04C22C28/00C22C30/00B22F9/023B22F9/04B22F2009/044C22C2202/02H01F41/0253H01F1/057
Inventor 付刚黄佳莹黄吉祥权其琛
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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