Preparation method of super-strong corrosion resisting neodymium-iron-boron magnet

A corrosion-resistant, neodymium-iron-boron technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the difficulty of chemical plating production management and process maintenance, the corrosion resistance time is not long, and the neodymium is easy to be damaged. Oxidation and other problems, to achieve super corrosion resistance, not easy to separate, improve the effect of electrochemical potential

Active Publication Date: 2013-07-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this requirement, various film-forming methods such as electroplating, electroless plating, chemical conversion film, electrophoresis, spray coating, evaporation and ion plating have been used for this purpose, but these methods have not yet solved this problem well. For example, organic coatings on the surface of magnets have requirements for the working environment,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) The master alloy is prepared by quick-setting thin-sheet casting process, and its nominal composition is Nd 29.1 Fe 68.64 B 0.96 (Dy 0.6 Nb 0.4 Zr 0.3 ) (wt%).

[0024] 2) The master alloy is crushed by hydrogen explosion method or crushed by a crusher. After crushing, the main phase alloy is passed through the jet mill abrasive to make a powder with an average particle diameter of 4.0 μm

[0025] 3) Degreasing the master alloy powder in the degreasing solution for 3 minutes, then cleaning it with ethanol, then immersing it in the activation solution for 10 seconds, and cleaning it with ethanol;

[0026] 4) Put the activated master alloy powder into the electroplating solution at 20°C, the anode used for electroplating is a copper rod, and the cathode current density is 2A / dm -2 , the moving speed of the cathode is 20 times / min, and the moving range is 10 mm. After 10 minutes of electroplating, take it out and clean it with ethanol;

[0027] 5) Put the cleaned...

Embodiment 2

[0039] 1) The master alloy is prepared by quick-setting thin-sheet casting process, and its nominal composition is Nd 30.5 Fe 66.04 B 0.96 (Dy 1.5 Al 0.1 co 0.5 Nb 0.4 ) (wt%).

[0040] 2) The master alloy is crushed by hydrogen explosion method or crushed by a crusher. After crushing, the main phase alloy passes through the jet mill abrasive to make a powder with an average particle diameter of 3.3 μm

[0041] 3) Degrease the master alloy powder in the degreasing solution for 5 minutes, then clean it with ethanol, then soak it in the activation solution for 30 seconds, and clean it with ethanol;

[0042] 4) Put the activated master alloy powder into the electroplating solution at 20°C, the anode used for electroplating is a copper rod, and the cathode current density is 2A / dm -2 , the moving speed of the cathode is 30 times / min, and the moving range is 50 mm. After 30 minutes of electroplating, take it out and clean it with ethanol;

[0043] 5) Put the cleaned powder ...

Embodiment 3

[0052] 1) NdFeB ingot master alloy is made by ingot casting process, and its nominal composition is Nd 28.5 Fe 68.2 B 1 Dy 2 Al 0.2 Cu 0.1 (wt%).

[0053] 2) The master alloy is subjected to coarse crushing by a jaw crusher and intermediate crushing by a secondary crusher. The crushed master alloy is respectively passed through a ball mill under the protection of nitrogen, and ball milled to a powder with an average particle diameter of 4.5 μm.

[0054] 3) Degrease the master alloy powder in the degreasing solution for 5 minutes, then clean it with ethanol, then soak it in the activation solution for 30 seconds, and clean it with ethanol;

[0055] 4) Put the activated master alloy powder into the electroplating solution at 20°C, the anode used for electroplating is a copper rod, and the cathode current density is 3.3A / dm -2 , the moving speed of the cathode is 30 times / min, and the moving range is 50 mm. After 3 minutes of electroplating, take it out and clean it with et...

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PUM

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Abstract

The invention discloses a preparation method of a super-strong corrosion resisting neodymium-iron-boron magnet. The preparation method comprises the following steps: 1) preparing a master alloy into a neodymium-iron-boron ingot alloy through an ingot casting process or preparing the master alloy into a neodymium-iron-boron rapid-hardening slice through a rapid-hardening slice manufacturing process; 2) implementing hydrogen decrepitation or mechanical disruption on the master alloy, and then preparing powder through airflow milling or ball milling; 3) carrying out oil removal on the master alloy powder through an oil removal liquid, and activating through an activating liquid; 4) adding the activated master alloy powder into a plating solution, electroplating copper, and drying through a vacuum drying machine; 5) compressing and moulding the dried powder in a magnetic field; 6) sintering in a high-vacuum sintering furnace to obtain a sintered magnet; and 7) carrying out oil removal on the surface of the magnet and activating, and then electroplating copper. The prepared neodymium-iron-boron magnet disclosed by the invention is remarkably high in corrosion resistance and strong in binding force between plating layer and substrate; and the process is simple and applicable to mass production.

Description

technical field [0001] The invention relates to a preparation method of a super-strong corrosion-resistant NdFeB magnet. Background technique [0002] NdFeB permanent magnet material has been developed since the mid-to-late 1980s. Due to its excellent magnetic properties and good performance-price ratio, it is a new material encouraged by the state and has become a popular choice for various industries in the national economy, especially the electronics and automobile industries. An irreplaceable basic material with a wide variety, widely used in many fields such as electronics, automobiles, computers, electricity, machinery, energy, environmental protection, national defense, medical equipment, etc. Products drive the development of various industries. [0003] As an important functional material, NdFeB rare earth permanent magnet material has played a significant role in various aspects. However, due to the strong chemical activity of Nd in NdFeB permanent magnets, it is...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057C25D3/38B22F1/02
Inventor 于濂清智倩倩韩雪王清清郭亮亮薛庆忠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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