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Method for preparing rare earth permanent magnet through hot press molding

A rare-earth permanent magnet, hot-press forming technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., to achieve the effect of saving the amount of use and improving the performance of magnetic materials

Active Publication Date: 2020-06-12
NINGBO JINKE AUTOMATIC EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even lower than the performance of existing sintered magnets

Method used

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  • Method for preparing rare earth permanent magnet through hot press molding
  • Method for preparing rare earth permanent magnet through hot press molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The material ratio of RFeB alloy is as follows:

[0047]

[0048] Vacuum smelting according to the above formula, quick-setting flakes to obtain 0.20-0.45mm thick RFeB alloy - quick-setting flakes.

[0049] The quick-setting flakes are processed according to the method described in this application, wherein the R T M alloy is DyCu alloy powder, in which Nd90% and Cu10%.

[0050] In order to ensure the performance, it is required that the surface of the quick-setting sheet has no oxide layer, and the discharge of the quick-setting furnace is required to be in a sealed barrel. When adding the hydrogen crushing furnace, it should also be strictly protected from contact with air.

[0051] Put the quick-setting flakes and the DyCu alloy powder accounting for 1% of the total mass of the quick-setting flakes into the HD treatment furnace. After the vacuum reaches 0.1Pa, carry out saturated hydrogen absorption, and the hydrogen pressure is 0.05MPa-0.2MPa. Then dehydrogen...

Embodiment 2

[0054] The material ratio of RFeB alloy is as follows:

[0055]

[0056] Vacuum smelting according to the above formula, quick-setting flakes to obtain 0.20-0.45mm thick RFeB alloy - quick-setting flakes.

[0057] Prepare TbCuAl alloy and its powder, Tb80%, Cu10%, Al10% (mass percentage).

[0058] The same implementation method as in Example 1, in this process, a part of TbCuAl sticks to the surface of the coarse particle after hydrogen crushing, and a part diffuses into the coarse powder.

[0059] Carry out jet pulverization, magnetic field forming, vacuum preheating, hot pressing, tempering treatment with the method identical with embodiment 1. A magnetic performance of 50EH was obtained. Remanence 14.0KGs, HcJ 2388KA / m.

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Abstract

The invention relates to a preparation method of a neodymium iron boron rare earth permanent magnet material, in particular to a method for preparing a rare earth permanent magnet through hot press molding. The problem that residual magnetism and coercive force of a rare earth permanent magnet prepared in the prior art cannot be high at the same time is solved. According to the method, RTM alloy is infiltrated in the HD treatment process, RTM adheres to the surface of the coarse powder and is infiltrated into the coarse powder along the grain boundary, the hot pressing temperature is low, crystal grains hardly grow up, and high coercive force is obtained under the condition that Dy and Tb do not exist. If the alloy containing Dy and Tb is infiltrated, the atoms diffuse to the surface layerof the main phase during preheating and heat treatment, and grain boundary hardening is achieved. The coercive force is greatly improved on the premise that the residual magnetism is reduced a little.

Description

technical field [0001] The invention relates to a preparation method of NdFeB rare earth permanent magnet materials, in particular to a method for preparing rare earth permanent magnets by hot pressing. Background technique [0002] Chinese Patent No. 201410094229 .6 discloses a method of using hot pressing to manufacture magnetic materials for permanent magnets, which incorporates a first material in the form of a nuclear powder containing Nd, Fe, and B, and a metal alloy containing A second material in the form of Dy, Tb, or a surface powder of both is combined such that a coated, composite-like material is formed having a non-uniform distribution of Dy or Tb constituting the second material, and then Perform thermoforming. For particles of 1-5 microns, it is impossible to coat the surface with a film of 1-10 nm, or industrial production. The given coating schemes such as mechanical grinding, vortex coating, ion sputtering, and high-voltage particle sputtering are diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F3/14B22F5/00
CPCH01F1/0576H01F41/0266B22F5/00B22F3/14B22F2998/10B22F2999/00B22F9/023B22F3/02B22F3/1017B22F2003/248B22F2202/05B22F3/24B22F1/05B22F2009/044B22F9/04B22F2301/45C22C2202/02H01F1/0573H01F1/0572B22F2201/20B22F2301/355
Inventor 董元
Owner NINGBO JINKE AUTOMATIC EQUIP CO LTD