Antioxidant treatment process of neodymium-iron-boron magnet

A treatment process, NdFeB technology, applied in the field of NdFeB magnets, can solve the problems of magnetic performance decline, damage, product stability and reliability, etc., to achieve enhanced oxidation resistance, strong anti-oxidation, strong anti-oxidation Oxidative effect

Active Publication Date: 2020-09-29
宁波美固力磁电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic properties of NdFeB permanent magnets are reduced or damaged due to oxidation and peeling failure, which seriously affects the service life of NdFeB permanent magnets and reduces the stability and reliability of products.

Method used

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  • Antioxidant treatment process of neodymium-iron-boron magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] An anti-oxidation treatment process for neodymium-iron-boron magnets, the specific steps are:

[0049] Step 1, first treating the NdFeB material in a hydrogen crushing treatment furnace to obtain NdFeB particles with a particle size of 10-200 μm;

[0050] Step 2, adding the NdFeB coarse powder and the first antioxidant into a planetary ball mill, then adding absolute ethanol for ball milling, and drying after the ball milling to obtain NdFeB coarse powder with a particle size of 1-5 μm pink;

[0051] Step 3, adding the first antioxidant to the NdFeB fine powder, mixing evenly, placing it in a jet mill for treatment, drying after the pulverization, and obtaining NdFeB fine powder with a particle size of 0.1-0.5 μm pink;

[0052] Step 4, adding the second antioxidant to acetone and mixing uniformly as a spray solvent, placing the NdFeB fine powder in a spray evaporator for treatment to obtain a NdFeB post-treatment product;

[0053] Step 5, pressing the post-treated Nd...

Embodiment 2

[0086] An anti-oxidation treatment process for neodymium-iron-boron magnets, the specific steps are:

[0087] Step 1, first treating the NdFeB material in a hydrogen crushing treatment furnace to obtain NdFeB particles with a particle size of 10-200 μm;

[0088] Step 2, adding the NdFeB coarse powder and the first antioxidant into a planetary ball mill, then adding absolute ethanol for ball milling, and drying after the ball milling to obtain NdFeB coarse powder with a particle size of 1-5 μm pink;

[0089] Step 3, adding the first antioxidant to the NdFeB fine powder, mixing evenly, placing it in a jet mill for processing, drying after the pulverization, and obtaining NdFeB fine powder with a particle size of 0.1-0.5 μm pink;

[0090] Step 4, adding the second antioxidant to acetone and mixing uniformly as a spray solvent, placing the NdFeB fine powder in a spray evaporator for treatment to obtain a NdFeB post-treatment product;

[0091] Step 5, pressing the post-treated N...

Embodiment 3

[0124] An anti-oxidation treatment process for neodymium-iron-boron magnets, the specific steps are:

[0125] Step 1, first treating the NdFeB material in a hydrogen crushing treatment furnace to obtain NdFeB particles with a particle size of 10-200 μm;

[0126] Step 2, adding the NdFeB coarse powder and the first antioxidant into a planetary ball mill, then adding absolute ethanol for ball milling, and drying after the ball milling to obtain NdFeB coarse powder with a particle size of 1-5 μm pink;

[0127] Step 3, adding the first antioxidant to the NdFeB fine powder, mixing evenly, placing it in a jet mill for treatment, drying after the pulverization, and obtaining NdFeB fine powder with a particle size of 0.1-0.5 μm pink;

[0128] Step 4, adding the second antioxidant to acetone and mixing uniformly as a spray solvent, placing the NdFeB fine powder in a spray evaporator for treatment to obtain a NdFeB post-treatment product;

[0129] Step 5, pressing the post-treated Nd...

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Abstract

The invention relates to the field of neodymium-iron-boron magnets and particularly relates to an anti-oxidation treatment process of a neodymium-iron-boron magnet. The process comprises the followingspecific steps of step 1, firstly, treating a neodymium-iron-boron material in a hydrogen decrepitation treatment furnace; step 2, adding first antioxidant for grinding; 3, adding the first antioxidant again, and placing the mixture in a jet mill to be treated; step 4, treating in a spray evaporator; 5, carrying out pressing according to the prefabricated shape; and 6, carrying out heat treatmenton a neodymium-iron-boron magnet blank to obtain the antioxidant neodymium-iron-boron magnet. The process is advantaged in that a problem of oxidation resistance of the neodymium-iron-boron permanentmagnet material is solved, the neodymium iron boron magnet is subjected to compression molding after being powdered, the first antioxidant adopts iron oxide black capable of serving as a magnetic rawmaterial as a base material and can be combined with the neodymium iron boron magnet more tightly, and in addition, the first antioxidant and the second antioxidant both contain kaempferol with highoxidation resistance, so the perfect complementary effect is achieved.

Description

technical field [0001] The invention relates to the field of neodymium-iron-boron magnets, in particular to an anti-oxidation treatment process for neodymium-iron-boron magnets. Background technique [0002] The characteristics of NdFeB permanent magnet alloy powder are: good magnetic properties and good mechanical properties, but low Curie temperature Tc, poor temperature stability, and poor chemical oxidation resistance, thus limiting its application range. The premise of the application of iron-boron permanent magnet materials is to first solve the problems of anti-oxidation and anti-corrosion of materials. In particular, the rare earth elements in the NdFeB alloy powder are active in nature, which makes the oxidation resistance of the entire NdFeB magnetic powder very poor, and it is easy to oxidize and rust in a hot and humid environment. In addition, the magnetic properties of NdFeB permanent magnet materials have a great relationship with their structure. The main ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F1/00B22F9/02B22F9/04
CPCH01F1/0572H01F1/0576H01F1/0577H01F41/026H01F41/0266H01F41/0253B22F9/023B22F9/04B22F2009/043B22F2009/044B22F1/10
Inventor 郑孟军
Owner 宁波美固力磁电有限公司
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