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A kind of grain boundary diffusion cerium magnet containing refe2 phase and preparation method thereof

A technology of grain boundary diffusion and magnets, which is applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of low diffusion efficiency and limited increase in the coercive force of cerium magnets, and achieve low diffusion efficiency and coercive force. Increased tenacity and good compatibility

Active Publication Date: 2020-10-16
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, all rare earth elements except La, Nd, Eu and Yb can form REFe 2 phase, due to REFe 2 The melting point of the phase is higher than that of the rare earth-rich phase, and the conventional grain boundary diffusion process is used, the diffusion efficiency is low, and the coercive force of the cerium magnet is limited.

Method used

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  • A kind of grain boundary diffusion cerium magnet containing refe2 phase and preparation method thereof
  • A kind of grain boundary diffusion cerium magnet containing refe2 phase and preparation method thereof
  • A kind of grain boundary diffusion cerium magnet containing refe2 phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The original cerium magnet is a 38M cerium magnet, the Ce content accounts for 20wt% of the total rare earth, and the alloy composition of the magnet is (Ce 0.2 Nd 0.7 Ho 0.1 ) 31.5 Fe 66.5 B 1.0 co 0.4 Cu 0.2 al 0.2 Nb 0.2 .

[0042] (1) Coarsely crush metal Tb, and then perform hydrogen decomposition to obtain TbH 3 , ball milled for 12h under the protection of ethanol to obtain the diffusion source slurry, control ethanol and TbH 3 The mass ratio is 1:1.

[0043] (2) Cut the above original 38M cerium magnet into Φ10*5mm 3 Clean the oil on the surface of the magnet, and use sandpaper to remove the oxide layer on the surface.

[0044] (3) Diffusion source TbH 3 The slurry mixed with ethanol is coated on the surface of the cylindrical magnet to obtain the attached diffusion source magnet.

[0045] (4) Cerium magnet with attached diffusion source in (Ce,Nd,Ho)Fe 2 Diffusion treatment was carried out near the melting point of the phase (940°C) for 10h.

[...

Embodiment 2

[0052] The composition of the pristine cerium magnet is (Ce 0.3 Nd 0.6 Gd 0.1 ) 31 Fe 67 B 1.0 co 0.2 Cu 0.2 al 0.4 Nb 0.2 , Ce content accounts for 30wt.% of the total amount of rare earth. The remanence of the magnet is 12.18kGs, the coercive force is 11.86kOe, and the magnetic energy product is 34.96MGOe.

[0053] Metal Dy was sputtered on the surface of the magnet by magnetron sputtering for 40 minutes, and then under vacuum conditions, after 850°C / 48h grain boundary diffusion treatment, the eutectic temperature of Ce-RE'-Gd was around 700°C Tempering for 12 hours, rapid cooling to room temperature to prepare the magnet of Example 2.

Embodiment 3

[0060] The composition of the pristine cerium magnet is (Ce 0.2 Nd 0.7 Dy 0.1 ) 31.5 Fe 66.5 B 1.0 co 0.3 Cu 0.2 Al 0.4 , Ce content accounts for 20wt.% of the total amount of rare earth. The remanence of the magnet is 12.15kGs, the coercive force is 16.06kOe, and the magnetic energy product is 34.60MGOe.

[0061] The surface of the magnet was coated with metal Tb powder by spraying method, followed by grain boundary diffusion treatment at 1000° C. / 0.1 h under vacuum condition, and then rapidly cooled to room temperature to obtain the magnet of Example 3.

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Abstract

The present invention relates to a kind of REFe-containing 2 Phase grain boundary diffusion cerium magnet and its preparation method, containing 2-14-1 main phase, REFe in the original cerium magnet 2 phase and RE-rich phase, REFe 2 Phase is CeFe 2 phase or (Ce,RE′)Fe 2 Phase, RE' is one or more of La, Pr, Nd, Pm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y, and the RE" element in the rare earth diffusion source passes through crystal Boundary diffusion treatment diffuses into the original cerium magnet, and the diffusion treatment temperature is REFe 2 The melting point temperature of the phase; then directly cooled or cooled to room temperature after tempering to obtain the final cerium magnet; the final cerium magnet contains the new 2‑14‑1 main phase, the new reinforced REFe 2 phase and the new rare earth-rich phase, the main phase of the new 2‑14‑1 is (Ce,RE″) 2 Fe 14 B or (Ce, RE', RE") 2 Fe 14 B main phase, new enhanced REFe 2 Phase is (CeRE″)Fe 2 phase or (Ce,RE′,RE″)Fe 2 phase; RE "is one or more of La, Pr, Nd, Pm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y. The present invention selects REFe 2 The melting point temperature of the phase is used as the grain boundary diffusion treatment temperature to improve the diffusion efficiency of the RE" element in the diffusion source and greatly increase the coercive force of the cerium magnet.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a REFe-containing 2 Phase grain boundary diffused cerium magnets and methods for their preparation. Background technique [0002] Rare earth permanent magnet materials are widely used in the fields of electromechanical, information, robotics and intelligent manufacturing. With the continuous expansion of applications such as wind power, new energy vehicles, rail transit, robots, and information, PrNd rare earths as the main raw material are consumed in large quantities, while the associated high-abundance rare earths La and Ce are in a large backlog. In recent years, with the development of double primary phase preparation technology for high-abundance rare earth permanent magnet materials, the industrialization of cerium magnets has been successfully realized, and the balanced utilization of rare earth resources has been realized. At the same time, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0293H01F1/0576H01F1/0571
Inventor 冯海波李安华李卫
Owner CENT IRON & STEEL RES INST