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Method for preparing crystal boundary nano-composite intensified neodymium iron boron magnet

A nanocomposite, NdFeB technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of toughness and magnetic performance decline of sintered NdFeB magnets that have not been found, and achieve suitable The effect of large-scale batch production, improving strength and toughness, and expanding the scope of application

Inactive Publication Date: 2014-03-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the alloying method sometimes causes a decrease in the magnetic properties of the magnet
Therefore, no suitable and effective method for improving the toughness of sintered NdFeB magnets has been found so far.

Method used

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  • Method for preparing crystal boundary nano-composite intensified neodymium iron boron magnet
  • Method for preparing crystal boundary nano-composite intensified neodymium iron boron magnet
  • Method for preparing crystal boundary nano-composite intensified neodymium iron boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Main phase alloy Nd 11 PR 2 Fe bal Zr 0.1 B 5.5 The quick-setting thin strip is made by the quick-setting strip-throwing process, the rotation speed of the copper roll is 2m / s, and the grain boundary phase alloy Nd 12 PR 20 Fe bal co 2 Cu 0.5 B 7 The quick quenching belt is made by the quick quenching process, and the quick quenching speed is 16m / s;

[0025] 2) The main phase alloy and the grain boundary phase alloy are roughly crushed by mechanical crushing, and then powders with an average particle diameter of 6 μm and 5 μm are respectively made into powders by jet milling under the protection of nitrogen;

[0026] 3) After mixing 1wt% graphene nanosheet powder and grain boundary phase alloy powder for 2 minutes, add 1wt% stearic acid for vacuum ball milling, so that it is evenly dispersed in the grain boundary phase alloy powder;

[0027] 4) uniformly mix the 7wt% graphene nano-reinforced grain boundary phase alloy powder with the main phase alloy powder...

Embodiment 2

[0032] 1) Main phase alloy Nd 16 Dy 1 Fe bal Ga 0.3 B 7 Ingot made by casting process, grain boundary phase alloy Nd 30 Dy 5 Fe bal Ni 3 Al 1 Nb 0.1 B 6.5 The quick quenching belt is made by the quick quenching process, and the quick quenching speed is 18m / s;

[0033] 2) The main phase alloy and the grain boundary phase alloy are coarsely crushed by hydrogen explosion crushing respectively, and then powders with average particle diameters of 2 μm and 1 μm are respectively made by ball milling under the protection of nitrogen;

[0034] 3) After mixing 10wt% graphene nanosheet powder and grain boundary phase alloy powder for 10 minutes, add 6wt% stearic acid for vacuum ball milling, so that it is evenly dispersed in the grain boundary phase alloy powder;

[0035] 4) After uniformly mixing 3wt% graphene nano-reinforced grain boundary phase alloy powder with the main phase alloy powder, orientation pressing is made into a green body in a 1.2T magnetic field;

[0036] 5...

Embodiment 3

[0040] 1) Main phase alloy Nd 12 PR 10 Fe bal co 0.5 Cu 0.5 Nb 0.1 B 6 The quick-setting thin strip is made by the quick-setting strip-throwing process, the rotation speed of the copper roll is 1.6m / s, and the grain boundary phase alloy Nd 20 Dy 2 Ho 2 Fe bal Mg 2 Ti 0.5 B 5 The quick quenching belt is made by the quick quenching process, and the quick quenching speed is 18m / s;

[0041] 2) The main phase alloy and the grain boundary phase alloy are roughly crushed by mechanical crushing, and then powders with an average particle diameter of 3.8 μm and 3 μm are respectively made into powders by jet milling under the protection of nitrogen;

[0042] 3) After mixing 3wt% graphene nanosheet powder and grain boundary phase alloy powder for 5 minutes, add 4wt% stearic acid for vacuum ball milling, so that it is evenly dispersed in the grain boundary phase alloy powder;

[0043] 4) uniformly mix 1wt% graphene nano-reinforced grain boundary phase alloy powder with the mai...

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Abstract

The invention discloses a method for preparing a crystal boundary nano-composite intensified neodymium iron boron magnet, and relates to the technology of preparing permanent magnet materials. The method comprises the steps that firstly, principal phase alloy is manufactured into an ingot casting or rapid hardening ribbon through a casting method or a rapid hardening melt-spinning method, and the crystal boundary phase alloy is manufactured into a rapid quenching belt through a rapid quenching method; secondly, the principal phase alloy and the crystal boundary phase alloy are respectively manufactured into powder; thirdly, the graphene nanosheet powder and the crystal boundary phase alloy powder are mixed, then ball-milling is carried out, and the graphene nanosheet powder is evenly scattered into the crystal boundary phase alloy powder; fourthly, the crystal boundary phase alloy powder intensified through the graphene nanosheet powder is evenly mixed with the principal phase alloy powder to be directionally pressed in a magnetic field into a green body; fifthly, the spark plasma sintering and tempering are carried out on the green body, and then the high-tenacity crystal boundary nano-composite intensified neodymium iron boron magnet is manufactured. The tenacity of the crystal boundary phase is improved through the crystal boundary nanometer composite intensifying, and on the premise of guaranteeing the magnetic performance of the magnet, the tenacity of the magnet is improved. The method is simple in technology, easy to operate and suitable for being produced in batches on a large scale.

Description

[0001] technical field [0002] The invention relates to the technical field of permanent magnet material preparation, in particular to a preparation method of a grain boundary nano-composite reinforced NdFeB magnet. Background technique [0003] As the third generation rare earth permanent magnet material, sintered NdFeB magnet has excellent magnetic properties and high cost performance that cannot be compared with other permanent magnet materials. Therefore, since its discovery, it has been extensively researched and developed rapidly, and has been widely used in high-tech fields such as computers, communication electronics, automobiles, and aviation. With the continuous improvement of magnetic properties, its application range is also expanding, which gradually highlights the shortcomings of its poor mechanical properties, which has become a major problem that limits its further application. Therefore, improving the mechanical properties of sintered NdFeB magnets has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F1/00B22F3/16
Inventor 崔熙贵崔承云程晓农许晓静
Owner JIANGSU UNIV
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