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Method for manufacturing corrosion-resistant Nd-Fe-B permanent-magnetic material

A technology for permanent magnet materials and manufacturing methods, which is applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, and the magnetism of inorganic materials. It can solve the problems affecting the application of NdFeB permanent magnet materials, poor corrosion resistance, etc. Effect of anisotropy field, cost reduction, and probability of hole formation

Active Publication Date: 2011-04-06
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of science and technology, the application range of NdFeB permanent magnet materials has been expanded, and higher requirements have been put forward for the corrosion resistance of NdFeB permanent magnet materials in some fields. During the manufacturing process of boron permanent magnet materials, many micropores will be produced in its surface, so NdFeB permanent magnet materials will be corroded in humid environment or in acidic air, and their own corrosion resistance is poor The disadvantages seriously affect the application of NdFeB permanent magnet materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Produced in the following steps:

[0020] (1) the following raw materials by weight: 26.679% neodymium (Nd), 65.030% iron (Fe), 0.983% boron (B), 1.725% dysprosium (Dy), 2.624% gadolinium (Gd) , 1.608% cobalt (Co), 0.245% aluminum (Al), and 1.106% zirconium (Zr) are mixed together for batching;

[0021] (2) Put the raw materials prepared in step (1) into the vacuum intermediate frequency induction furnace, adjust the pressure of the vacuum intermediate frequency induction furnace, when the vacuum degree reaches 2.1×10 -2 Under the condition of Pa, the raw materials in the furnace are heated and melted, and at the same time, an atmospheric pressure of Ar gas is filled for refining, and then the hydrogenated alloy ingot is cast in the hydrogen crushing furnace, and the hydrogenated alloy ingot is ground into an average particle size in the jet mill. 3.46μm magnetic powder, orientated and pressed into a formed magnetic alloy in a magnetic field with a magnetic field stren...

Embodiment 2

[0031] Produced in the following steps:

[0032] (1) the following raw materials by weight: 23.429% neodymium (Nd), 64.646% iron (Fe), 0.993% boron (B), 2.713% dysprosium (Dy), 4.774% gadolinium (Gd) , 1.789% cobalt (Co), 0.410% aluminum (Al), and 1.246% zirconium (Zr) are mixed together for batching;

[0033] (2) Put the raw materials prepared in step (1) into the vacuum intermediate frequency induction furnace, adjust the pressure of the vacuum intermediate frequency induction furnace, when the vacuum degree reaches 2.1×10 -2 Under the condition of Pa, the raw materials in the furnace are heated and melted, and at the same time, an atmospheric pressure of Ar gas is filled for refining, and then the hydrogenated alloy ingot is cast in the hydrogen crushing furnace, and the hydrogenated alloy ingot is ground into an average particle size in the jet mill. 3.46μm magnetic powder, orientated and pressed into a formed magnetic alloy in a magnetic field with a magnetic field stren...

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Abstract

The invention relates to a method for manufacturing a corrosion-resistant Nd-Fe-B permanent-magnetic material, comprising the steps of: mixing the following raw materials: 22.962-30.204 by weight of Nd, 50.289-72.955 by weight of Fe, 1.033-1.207 by weight of B, 0.776-6.806 by weight of Dy, 1.252-6.586 by weight of Gd, 0.563-2.057 by weight of Co, 0.129-0.942 by weight of Al and 0.290-1.910 by weight of Zr; refining; pressing; and sintering. Due to the addition of metal elements Gd and Zr, the compactness of the Nd-Fe-B permanent-magnetic material is improved, the grains are refined, micropores on the magnet surface are reduced, the interatomic interaction is increased, and the magnet density can reach more than 7.65mg / cm<3>, thus greatly improving the corrosion-resistant property of the Nd-Fe-B permanent magnetic material and lowering the cost.

Description

technical field [0001] The invention relates to a manufacturing method of a permanent magnetic material, in particular to a manufacturing method of a corrosion-resistant NdFeB permanent magnetic material. Background technique [0002] At present, permanent magnet materials are widely used in many fields such as electronics, automobiles, computers, energy, machinery, medical equipment, etc., such as manufacturing various permanent magnet motors, vibration motors, permanent magnet instruments, electronics industry (magnetic rings on mobile phones, computers , magnetic column), automobile industry, petrochemical industry, nuclear magnetic resonance device, audio equipment (audio, earphone, loudspeaker, circular magnetic piece of magnetic vibrator), magnetic levitation system, permanent magnet crane, magnetic separator, magnetic transmission mechanism and magnetic Among them, NdFeB permanent magnet materials have the advantages of excellent magnetic properties and low price, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/12
Inventor 袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD
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