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A kind of preparation of rare earth permanent magnet sm 2 fe 17 n x powder process

A rare earth permanent magnet and process technology, applied in inorganic chemistry, chemical instruments and methods, iron compounds, etc., can solve problems such as alloy composition deviation, and achieve the effects of less volatilization, good reproducibility, and easy control of phase composition

Active Publication Date: 2017-03-08
北京钐元新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the purity of the alloy can be improved by adding more Sm (such as 18% to 24% more than the theoretical value) by means of compensation, the deviation of the alloy composition will still be caused by the fluctuation of the process parameters.

Method used

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  • A kind of preparation of rare earth permanent magnet sm <sub>2</sub> fe <sub>17</sub> n <sub>x</sub> powder process
  • A kind of preparation of rare earth permanent magnet sm <sub>2</sub> fe <sub>17</sub> n <sub>x</sub> powder process
  • A kind of preparation of rare earth permanent magnet sm <sub>2</sub> fe <sub>17</sub> n <sub>x</sub> powder process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, Fe powder and Sm powder were used as raw materials, and Sm was prepared by solid-liquid phase diffusion reaction method. 2 Fe 17 intermetallic compounds, and then prepared into Sm by nitriding 2 Fe 17 N x Powder. The specific process is as follows:

[0033] ①In the glove box, Fe powder (average particle size ~8 μm, purity 99.9 wt%) and Sm powder (average particle size 20 μm, purity 99.9 wt%) were weighed at a molar ratio of 2.4:17, totaling 0.5 kg.

[0034] ②Put the weighed raw material powder into a 2L sealable stainless steel ball mill jar. There are two types of stainless steel grinding balls: Φ12mm and Φ6mm, the mass ratio of ball to material is 8:1, and the volume ratio of ball to tank is ~30%. In order to prevent oxidation, add absolute ethanol to the ball mill tank to cover the ball material. Then the ball mill jar was installed on the planetary ball mill, and the ball mill was carried out for 6 hours at a speed of 125 r / m.

[0035] ③ Vac...

Embodiment 2

[0042] In this embodiment, FeHfCo powder (average particle size is ~10 μm, purity 99.9wt%, Hf content 10wt%, Co content 8wt%) and Sm powder (average particle size is 20 μm, purity 99.9wt%) are selected as raw material powder; wherein, " The molar ratio of "Sm and Hf" to "Fe and Co" is 2.3:17. All the other are prepared into Sm by the same processing step of embodiment 1 2 Fe 17 N x (i.e. (Sm,Hf) 2 (Fe,Co) 17 ) powder.

[0043] In this embodiment Sm 2 Fe 17 N x Among them, x=2.876. The obtained magnetic powder is prepared into a bonded body, and the magnetic properties are measured as follows: maximum energy product (BH) max =295kJ / m 3 , Coercivity Hcj=10×10 6 A / m, remanence Br=8.6×10 5 A / m.

Embodiment 3

[0045] In this embodiment, FeHfCo powder (average particle size is ~10 μm, purity 99.9wt%, Hf content 10wt%, Co content 8wt%) and Sm powder (average particle size is 20 μm, purity 99.9wt%) are selected as raw material powder; wherein, " The molar ratio of "Sm and Hf" to "Fe and Co" is 2.3:17. The solid-liquid phase diffusion reaction conditions are: 1150°C, 1.4×10 5 PaAr, keep warm for 6h. All the other are prepared into Sm by the same process step of embodiment 2 2 Fe 17 N x (i.e. (Sm,Hf) 2 (Fe,Co) 17 ) powder.

[0046] In this embodiment Sm 2 Fe 17 N x Among them, x=2.934. Prepare the obtained magnetic powder into a bonded body, and measure the magnetic properties as follows: Maximum magnetic energy product (BH) max =310kJ / m 3 , Coercivity Hcj=12×10 6 A / m, remanence Br=11.2×10 5 A / m.

[0047] Table 1 Comparison of magnetic properties of magnetic powder bonded bodies prepared in Examples

[0048]

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Abstract

The invention belongs to the technical field of rare earth permanent magnets and particularly provides a process of preparing a rare earth permanent magnet Sm2Fe17NX powder. According to the process, an Fe-M powder and an Sm powder are employed as raw materials (wherein M is selected from one or more than two from Hf, Zr, Co, Nb, Cr, V, Ti, Ga, B and the like), and a solid-liquid phase diffusion reaction method is employed to prepare a Sm2Fe17 intermetallic compound, and finally the intermetallic compound is nitrided to obtain the final product Sm2Fe17NX. The process includes the steps of (1) uniformly mixing the Fe-M powder and the Sm powder; (2) performing cold-pressing moulding to the mixed raw material powder; (3) performing the solid-liquid phase diffusion reaction to the cold-pressed billet to obtain a Sm2Fe17 mono-phase block; and (4) crushing and grinding the Sm2Fe17 mono-phase block into powder, performing nitridation to the powder under an atmosphere containing nitrogen or ammonia to prepare the Sm2Fe17NX powder. On the basis of the Sm2Fe17NX powder, an aeolotropic bonded magnet having excellent performances can be produced. The process is simple in operations, is easy to control in process parameters, is environment-protective and pollution-free, and is easy to achieve large-scale production.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a method for preparing rare earth permanent magnet Sm 2 Fe 17 N x Powder process, using Fe-M alloy and pure Sm powder as raw materials, preparing Sm by solid-liquid phase diffusion reaction method 2 Fe 17 alloy, and then prepared Sm by gas nitriding 2 Fe 17 N x (x=2.7~3) Powder. Background technique [0002] As we all know, the third-generation rare earth permanent magnet NdFeB has obtained unprecedented magnetic properties, and is known as the "Magnetic King". Due to its excellent magnetic properties and my country's rich neodymium resources, its research, development and production have developed rapidly. Especially in recent years, with the rapid development of computer, electronic communication, electric vehicle, wind power generation, aerospace and other industrial fields, the application range and importance of high-performance rare earth permane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
Inventor 白雪铠孙世明刘泽
Owner 北京钐元新材料股份有限公司
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