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

A raw material composition, neodymium iron boron technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problem that the coercivity and remanence of magnet materials cannot be significantly improved

Active Publication Date: 2020-02-21
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.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0126] The preparation method of NdFeB magnet material is as follows:

[0127] (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. In the smelting furnace after vacuum smelting, Ar gas is introduced to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec~10 4 °C / sec cooling rate to obtain quenched alloy.

[0128] (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 hydro...

Embodiment 43 and 44

[0135] Embodiment 43 and 44 adopt the preparation technology of Tb grain boundary diffusion method

[0136] The raw material compositions numbered 12 and 16 in Table 1 were first prepared according to the preparation of the sintered body in Example 1 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] 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 and a raw material composition thereof, and a preparation method and application of a neodymium-iron-boron magnet material. The raw material composition of the neodymium-iron-boron magnet material is prepared from the following components in percentage by mass: 29.5-32% of R' which is a rare earth element and comprises Pr and Nd, wherein Pr>=17.15%; Cu being not less than 0.35%; 0.9-1.2% of B; and Fe: 64-69.2%, wherein the percentage refers to the mass percentage of the total mass of the raw material composition of the neodymium-iron-boron magnet material. According to the neodymium-iron-boron magnet material disclosed by the invention, the residual magnetism and the coercive force of the obtained neodymium-iron-boron magnet material are still relatively high under the condition that heavy rare earth elements are not added.

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. On the other hand, the NdFeB magnet materials with better coercive force and remanent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266H01F41/0293H01F1/0573
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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