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A kind of preparation method of high corrosion resistance composite coating on the surface of sintered ndfeb magnet

A composite coating, high corrosion resistance technology, applied in coating, metal material coating process, ion implantation plating and other directions, can solve the problem of difficult to achieve large-scale industrial production, magnetron sputtering technology, low coating efficiency, composite The problem of high coating cost has achieved significant economic and practical value, abundant reserves, and reduced production costs.

Active Publication Date: 2018-08-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of Ti element, the cost of preparing composite coatings by this method is high, and the coating efficiency of magnetron sputtering technology is low, and the investment in equipment is high, making it difficult to achieve large-scale industrial production.

Method used

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  • A kind of preparation method of high corrosion resistance composite coating on the surface of sintered ndfeb magnet
  • A kind of preparation method of high corrosion resistance composite coating on the surface of sintered ndfeb magnet
  • A kind of preparation method of high corrosion resistance composite coating on the surface of sintered ndfeb magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment sinters the high corrosion-resistant composite coating on the surface of the NdFeB magnet according to the following steps:

[0024] Step 1. Pre-coating the sintered NdFeB magnet by pickling. The specific step is to wash the sintered NdFeB magnet in dilute nitric acid with a mass concentration of 3% for 50 seconds.

[0025] Step 2. Carry out in-furnace pretreatment to the sintered NdFeB magnet after step 1 treatment:

[0026] Put the sintered NdFeB magnet processed in step 1 into the cage in the ion coating machine, and use the cyclic argon ion bombardment process to bombard the sintered NdFeB magnet, keeping the vacuum degree of the vacuum chamber at 3Pa, Ar 2 The flow rate is 130 sccm, and the bombardment is 30 minutes.

[0027] Step 3. Deposit Zn film on the surface of the sintered NdFeB magnet by means of magnetron sputtering: keep the vacuum degree of the vacuum chamber at 1×10 -1 Pa, Ar 2 The flow rate is 50 sccm, the bias voltage is 120V, the m...

Embodiment 2

[0038] This embodiment sinters the high corrosion-resistant composite coating on the surface of the NdFeB magnet according to the following steps:

[0039] Step 1: Pre-coating the sintered NdFeB magnet by sandblasting.

[0040] Step 2. Pre-treat the sintered NdFeB magnet processed in step 1 in the furnace: put the sintered NdFeB magnet processed in step 1 into the mesh cage in the furnace, and bombard the sintered NdFeB magnet with a cyclic argon ion bombardment process. Keep the vacuum chamber vacuum at 6.5Pa, Ar 2 The flow rate is 155 sccm, and the bombardment is 40 minutes.

[0041] Step 3. Deposit Zn film on the surface of the sintered NdFeB magnet by means of magnetron sputtering: keep the vacuum degree of the vacuum chamber at 2×10 -1 Pa, Ar 2 The flow rate is 75 sccm, the bias voltage is 145V, the magnetron sputtering current is 14A, and the magnetron sputtering is 45min.

[0042] Step 4. Re-deposit Al film on the surface of the Zn film deposited in step 3 by vacuum e...

Embodiment 3

[0052] This embodiment sinters the high corrosion-resistant composite coating on the surface of the NdFeB magnet according to the following steps:

[0053] Step 1: Perform pre-coating treatment on the sintered NdFeB magnet by means of polishing.

[0054] Step 2. Pre-treat the sintered NdFeB magnet processed in step 1: put the sintered NdFeB magnet processed in step 1 into the cage in the ion coating machine, and use the cyclic argon ion bombardment process to sinter the sintered NdFeB magnet. Carry out bombardment, keep the vacuum degree of the vacuum chamber at 10Pa, Ar 2 The flow rate is 180 sccm, and the bombardment is 50 minutes.

[0055] Step 3. Deposit Zn film on the surface of the sintered NdFeB magnet by means of magnetron sputtering: keep the vacuum degree of the vacuum chamber at 3×10 -1 Pa, Ar 2 The flow rate is 100 sccm, the bias voltage is 170V, the magnetron sputtering current is 16A, and the magnetron sputtering is 60min.

[0056] Step 4. Re-deposit Al film ...

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Abstract

The invention discloses a preparation method for a high-corrosion resistance composite coating on a surface of a sintered NdFeB magnet. The preparation method is characterized by comprising the following steps: performing film coating pretreatment and in-furnace pretreatment on the sintered NdFeB magnet; then, depositing a Zn thin film in a manner of magnetron sputtering; then, depositing an Al thin film in a manner of vacuum evaporation; and continuing to repeatedly deposit a Zn thin film and an Al thin film to finish preparation of the high-corrosion resistance composite coating. According to the preparation method disclosed by the invention, by combining a magnetron sputtering Zn thin film process and a vacuum evaporation Al thin film process, metals Zn and Al can be matched very well, and a binding force between Zn / Al composite thin films is very high; therefore, by alternately depositing the Zn thin films and the Al thin films on an NdFeB matrix, a binding force between the Al thin films and the matrix can be obviously increased; moreover, the Zn thin films are capable of effectively interrupting growth of columnar crystal structures of the Al thin films, therefore corrosive liquid is stopped from permeating to arrive a rapid corrosion channel of the matrix, and the corrosion resistance of the NdFeB magnet is obviously improved.

Description

technical field [0001] The invention relates to a method for preparing a high corrosion-resistant composite coating on the surface of a sintered NdFeB magnet, belonging to the field of magnetic material surface protection. Background technique [0002] Since its appearance in 1983, sintered NdFeB permanent magnet has been called the "Magnetic King" for its excellent magnetic properties. Instrumentation, aerospace and many other fields. However, due to the particularity of the preparation process of sintered NdFeB permanent magnets, it has the characteristics of multi-phase structure, which leads to the disadvantages of poor corrosion resistance and serious self-powdering phenomenon of sintered NdFeB permanent magnets, which seriously limits the expansion of its application field. At present, there are two main methods for improving the corrosion resistance of sintered NdFeB permanent magnets: one is to add alloy elements; the other is to add a protective layer on the surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/16C23C14/24C23C14/02
CPCC23C14/022C23C14/028C23C14/16C23C14/24C23C14/35
Inventor 刘家琴曹玉杰张鹏杰张浩邓少杰吴玉程
Owner HEFEI UNIV OF TECH