Process of preparing rare earth permanent magnet Sm2Fe17NX powder

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

Active Publication Date: 2015-12-09
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

Benefits of technology

The present invention uses a solid-liquid phase diffusion reaction to prepare Sm2Fe17 Alloy, resulting in a controlled phase composition. The process is reproducible, efficient, and environmentally friendly. It is suitable for large-scale production and produces magnetic powder that can be used to make high-performance anisotropic magnets. These magnets have a maximum magnetic energy product, high coercivity, and strong remanence.

Problems solved by technology

This patents describes various technical problem addressed during this patent relating to improving the quality and efficiency of sintered magnets made from these types of iron boron alloys. Specifically, it focus on achieving stable and reliable performance over time while maintaining their superior characteristics such as coercivity, resistive force, corrosiveness, heat capacity, and durability.

Method used

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  • Process of preparing rare earth permanent magnet Sm2Fe17NX powder
  • Process of preparing rare earth permanent magnet Sm2Fe17NX powder
  • Process of preparing rare earth permanent magnet Sm2Fe17NX powder

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 without passing 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...

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. Prepare the obtained magnetic powder into a bonded body, and measure the magnetic properties as follows: Maximum magnetic 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] The magnetic performance comparison of the prepared magnetic powder bonded body in the embodiment of table 1

[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

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Claims

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Application Information

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Owner 北京钐元新材料股份有限公司
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