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A kind of preparation method of corrosion-resistant NdFeB magnet

A neodymium-iron-boron, corrosion-resistant technology, used in the manufacture of permanent magnets, magnetic objects, inductors/transformers/magnets, etc., can solve problems such as poor mechanical properties, improve strength, improve magnetic energy product and coercivity, improve performance effect

Active Publication Date: 2021-08-10
宁波中杭磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous improvement of magnetic properties, its application range is also expanding, which also gradually highlights the shortcomings of its poor mechanical properties, which has become a major problem that limits its further application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This embodiment provides a method for preparing a corrosion-resistant NdFeB magnet, the corrosion-resistant NdFeB magnet includes an NdFeB magnet and a corrosion-resistant layer coated on the surface of the NdFeB magnet, and the NdFeB magnet Including 1 part of graphene, 1 part of nickel powder, 1 part of zinc powder, 10 parts of modifier and 70 parts of NdFeB powder by weight; 1-x Ta x )O 3 , where 0.1≤x≤0.9;

[0015] The corrosion-resistant layer includes 70 parts of aluminum, 10 parts of copper, 1 part of rare earth and 0.1 part of bismuth by weight;

[0016] The preparation method of the above-mentioned corrosion-resistant NdFeB magnet comprises the following steps:

[0017] Step 1, the preparation of the modified body, according to the general chemical formula Ag(Nb 1-x Ta x )O 3 The molar ratio of each component in 1:0.2:0.8, take raw material Ag 2 O, Nb 2 o 5 and Ta 2 o 5 Mix, then put the mixed raw materials and solvent into the ball mill tank at a ma...

Embodiment 2

[0022] The preparation method of a corrosion-resistant NdFeB magnet provided in this embodiment is different from Example 1 in that the NdFeB magnet includes 3 parts of graphene, 2 parts of nickel powder, 5 parts of zinc powder, 15 parts of modifiers and 90 parts of NdFeB powders, said modifier Ag(Nb 0.4 Ta 0.6 )O 3 The molar ratio of each component is 1:0.4:0.6.

Embodiment 3

[0024] The preparation method of a corrosion-resistant NdFeB magnet provided in this example is different from Example 1 in that the NdFeB magnet includes 2 parts of graphene, 1 part of nickel powder, 3 parts of zinc powder, 12 parts of modifiers and 90 parts of NdFeB powder, said modifier Ag(Nb 0.5 Ta 0.5 )O 3 The molar ratio of each component is 1:0.5:0.5.

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PUM

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Abstract

The invention provides a method for preparing a corrosion-resistant NdFeB magnet. The corrosion-resistant NdFeB magnet includes an NdFeB magnet and a corrosion-resistant layer coated on the surface of the NdFeB magnet. Parts by weight include 1-3 parts of graphene, 1-2 parts of nickel powder, 1-5 parts of zinc powder, 10-15 parts of modifier and 70-90 parts of NdFeB powder; Ag(Nb 1‑x Ta x )O 3 , wherein 0.1≤x≤0.9; the corrosion-resistant layer includes 70-80 parts of aluminum, 10-15 parts of copper, 1-2 parts of rare earth and 0.1-0.5 parts of bismuth by weight; a corrosion-resistant neodymium provided by the invention The preparation method of the iron-boron magnet can not only improve the magnetic energy product and coercive force of the NdFeB magnet, but also improve the corrosion resistance of the NdFeB magnet.

Description

technical field [0001] The invention relates to the field of neodymium iron boron, in particular to a preparation method of a corrosion-resistant neodymium iron boron magnet. Background technique [0002] As the third generation rare earth permanent magnet material, 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 become an important basis for expanding its applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/026
Inventor 楼永华
Owner 宁波中杭磁材有限公司