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Method for preparing aluminum or aluminum-tin alloy plated layer on surface of sintered neodymium-iron-boron permanent magnet

A technology of aluminum-tin alloy and neodymium-iron-boron, which is applied in the direction of metal material coating process, coating, sputtering plating, etc., can solve the problems of reduced coating adhesion, limited coating types and protective capabilities, and weakened protective performance. , to achieve good binding effect

Inactive Publication Date: 2018-02-02
HUBEI UNIV OF AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Sintered NdFeB permanent magnets are widely used in various motors, instruments, household appliances, computers, medical equipment and other industries due to their excellent magnetic properties; however, the special structure of sintered NdFeB permanent magnets makes them exist Poor corrosion resistance, hydrogen absorption pulverization, and easy oxidation under high temperature and humidity conditions; therefore, it is necessary to carry out protective treatment on the surface of sintered NdFeB permanent magnets
[0003] The surface protection treatment methods of sintered NdFeB permanent magnets mainly include electroplating, chemical plating, organic coating, electrophoresis, etc.; the surface protection layer mainly includes metal coating and polymer coating; the metal coating can be electroplating Ni, electroplating Zn , electroless Ni-P alloy plating, etc.; the main materials of polymer coatings are organic polymers such as resins, such as epoxy resins, polyacrylates, polyimides, etc.; methods such as electroplating, chemical plating, and cathodic electrophoresis will cause environmental pollution. pollution, and its coating type and protective ability are limited. Organic coatings can play a good protective role at room temperature, but as the temperature increases, the adhesion of the coating decreases, resulting in weakened protective performance

Method used

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  • Method for preparing aluminum or aluminum-tin alloy plated layer on surface of sintered neodymium-iron-boron permanent magnet
  • Method for preparing aluminum or aluminum-tin alloy plated layer on surface of sintered neodymium-iron-boron permanent magnet
  • Method for preparing aluminum or aluminum-tin alloy plated layer on surface of sintered neodymium-iron-boron permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Place the processed ultra-high-performance sintered NdFeB magnet blank with a grade of 40EH in a degreasing solution for surface degreasing, and the degreasing time is 10 minutes; then grind and polish the degreased NdFeB substrate , cleaned with a nitric acid solution with a mass fraction of 3%, and ultrasonically cleaned the substrate in a pure alcohol solution for 30 minutes, and put the cleaned NdFeB substrate into an oven for drying at a temperature of 120 ℃, time is 20 minutes;

[0021] (2) Put the sintered NdFeB substrate into the magnetron sputtering ion plating equipment, the distance from the substrate to the pure aluminum target is 12cm, turn on the ion plating equipment and cooling circulating water; vacuum the ion plating equipment to 1×10 -3 Pa, then pass in argon gas, control the flow rate of argon gas, adjust the air pressure in the chamber to 2Pa, and use 800V bias power supply for glow discharge cleaning for 20 minutes;

[0022] (3) Adjust the bia...

Embodiment 2

[0029] (1) Place the processed ultra-high-performance sintered NdFeB magnet blank with a grade of 40EH in a degreasing solution for surface degreasing, and the degreasing time is 10 minutes; then grind and polish the degreased NdFeB substrate , cleaned with a nitric acid solution with a mass fraction of 3%, and ultrasonically cleaned the substrate in a pure alcohol solution for 30 minutes, and put the cleaned NdFeB substrate into an oven for drying at a temperature of 120 ℃, time is 20 minutes;

[0030] (2) Put the sintered NdFeB substrate into the magnetron sputtering ion plating equipment, the distance from the substrate to the pure aluminum target is 12cm, turn on the ion plating equipment and cooling circulating water; vacuum the ion plating equipment to 1×10 -3 Pa, then pass in argon gas, control the flow rate of argon gas, adjust the air pressure in the chamber to 2Pa, and use 800V bias power supply for glow discharge cleaning for 20 minutes;

[0031] (3) Adjust the bia...

Embodiment 3

[0039] Step in embodiment 2 The vacuum heat treatment furnace is changed into a non-vacuum heat treatment furnace, and all the other processes are the same as in Example 2.

[0040] The surface morphology of the aluminum protective coating on the surface of the sintered NdFeB permanent magnet prepared by the above procedure is as follows: image 3 , and its properties are shown in Table 3-1 and Table 3-2:

[0041]

[0042]

[0043] According to Table 3-1 and Table 3-2, it can be concluded that when the non-vacuum heat treatment temperature is 530°C, the corrosion resistance and bonding force of the coating are better.

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Abstract

The invention discloses a method for preparing an aluminum or aluminum-tin alloy plated layer on the surface of a sintered neodymium-iron-boron permanent magnet. The method is characterized in that magnetron-sputtering ion plating equipment is adopted, a sintered neodymium-iron-boron base body is cleaned, dried and then placed in a vacuum chamber, and the distance between the base body and a target material is adjusted; high vacuum is pumped, argon is led into the vacuum chamber for ion bombarding cleaning, and the aluminum-tin alloy plated layer is prepared through multi-arc ion plating; thetemperature in the vacuum chamber is decreased to be the indoor temperature, and then a neodymium-iron-boron magnet is taken out; and the plated neodymium-iron-boron magnet is placed into a heat treatment furnace and heated to a certain temperature to be subjected to plated layer diffusion and surface oxidation treatment, and thus the surface plated layer with the good surface form and corrosion performance is obtained. According to the method for preparing the aluminum or aluminum-tin alloy plated layer on the surface of the sintered neodymium-iron-boron permanent magnet, the preparation process is environmentally friendly, pollution is voided, the technique is stable, the magnetic performance of the magnet is not lowered, the obtained neodymium-iron-boron magnet surface plated layer canachieve metallurgical combination, the combining force of the base body and the plated layer is good, and the corrosion resistance of the sintered neodymium-iron-boron permanent magnet can be obviously improved.

Description

technical field [0001] The invention relates to the field of surface treatment of sintered NdFeB permanent magnets, in particular to a method for preparing an aluminum or aluminum-tin alloy coating on the surface of a sintered NdFeB permanent magnet. Background technique [0002] Sintered NdFeB permanent magnets are widely used in various motors, instruments, household appliances, computers, medical equipment and other industries due to their excellent magnetic properties; however, the special structure of sintered NdFeB permanent magnets makes them exist Poor corrosion resistance, hydrogen absorption pulverization, and easy oxidation under high temperature and humidity conditions; therefore, it is necessary to carry out protective treatment on the surface of sintered NdFeB permanent magnets. [0003] The surface protection treatment methods of sintered NdFeB permanent magnets mainly include electroplating, chemical plating, organic coating, electrophoresis, etc.; the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/32C23C14/58
CPCC23C14/16C23C14/325C23C14/5806C23C14/5853
Inventor 胡志华罗成马冬威王天国
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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