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Multilayer composite protective coating on surface of sintered NdFeB magnet by multi-arc ion plating and process thereof

A multi-arc ion plating and protective coating technology, which is applied in metal material coating technology, ion implantation plating, coating, etc., can solve the problem of poor bonding between aluminum film and substrate, insufficient bonding force, and low production efficiency. Low and other problems, to achieve the effect of deteriorating corrosion resistance, low cost, and prolonging service life

Active Publication Date: 2014-09-03
北京钐元新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, vacuum evaporation is mainly used for aluminum plating on NdFeB, which can be coated in large quantities, and the coating efficiency is also high. However, the bonding force between the vacuum evaporated aluminum film and the substrate is poor, and defects such as pinholes are prone to occur in the film.
At the same time, magnetron sputtering technology is also used, which can improve the bonding force between the film and the substrate and the compactness of the film, but the coating rate of this technology is low, the production efficiency is correspondingly low, and the bonding force still cannot meet the requirements.

Method used

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  • Multilayer composite protective coating on surface of sintered NdFeB magnet by multi-arc ion plating and process thereof
  • Multilayer composite protective coating on surface of sintered NdFeB magnet by multi-arc ion plating and process thereof
  • Multilayer composite protective coating on surface of sintered NdFeB magnet by multi-arc ion plating and process thereof

Examples

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Effect test

Embodiment 1

[0040] In this embodiment, the process of preparing multi-layer composite protective coating by multi-arc ion plating on the surface of NdFeB magnets adopts multi-arc ion plating deposition technology to prepare Ti or Cr transition layer, Al or Al alloy corrosion-resistant layer on the surface of sintered NdFeB magnets. , Transparent AlN surface barrier and wear-resistant layer composite protective coating, the prepared composite protective coating has excellent corrosion protection performance for sintered NdFeB magnets.

[0041] Among them, the multi-arc ion plating process is used to prepare multi-layer composite protective coatings on the surface of sintered NdFeB magnets with various shapes and large sizes. The specific process is as follows:

[0042] ① For a sintered NdFeB magnet, the shape is cuboid, and the size is 50mm×20mm×2mm. First put the NdFeB magnet into the alkaline degreasing solution (3g / L aqueous solution of metal cleaning agent HJ-W122), degreasing at a tem...

Embodiment 2

[0051] In this embodiment, the process of preparing multi-layer composite protective coating by multi-arc ion plating on the surface of NdFeB magnets adopts multi-arc ion plating deposition technology to prepare Ti or Cr transition layer, Al or Al alloy corrosion-resistant layer on the surface of sintered NdFeB magnets. , Transparent AlN surface barrier and wear-resistant layer composite protective coating, the prepared composite protective coating has excellent corrosion protection performance for sintered NdFeB magnets.

[0052] Among them, the multi-arc ion plating process is used to prepare a multi-layer composite protective coating on the surface of a sintered NdFeB magnet with a corrugated small size (length, width and height: 4mm×2mm×1.5mm). The specific process is as follows:

[0053] ① For a sintered NdFeB magnet, the size is small (length x width x height = 4mm x 2mm x 1.5mm) and corrugated. First put the NdFeB magnet into the alkaline degreasing solution (3g / L aqueo...

Embodiment 3

[0063] In this embodiment, the process of preparing multi-layer composite protective coating by multi-arc ion plating on the surface of NdFeB magnets adopts multi-arc ion plating deposition technology to prepare Ti or Cr transition layer, Al or Al alloy corrosion-resistant layer on the surface of sintered NdFeB magnets. , Transparent AlN surface barrier and wear-resistant layer composite protective coating, the prepared composite protective coating has excellent corrosion protection performance for sintered NdFeB magnets.

[0064] Among them, the multi-arc ion plating process is used to prepare multi-layer composite protective coatings on the surface of sintered NdFeB magnets of various shapes and sizes. The specific process is as follows:

[0065] ①For a sintered NdFeB magnet, the size is 10mm×10mm×10mm. First put the NdFeB magnet into the alkaline degreasing solution (3g / L aqueous solution of metal cleaning agent HJ-W122), degreasing at a temperature of 50°C for 5min; then p...

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Abstract

The invention belongs to the technical field of surface protective coating, and particularly relates to a multilayer composite protective coating on the surface of a sintered NdFeB magnet by multi-arc ion plating and a process thereof. By adopting the multi-arc ion plating deposition technology, a transition layer, a corrosion-proofing layer and a surface barrier and wearing layer composite protective coating are prepared on the surface of the sintered NdFeB magnet, the corrosion resistance of the sintered NdFeB magnet is obviously improved, and the service life is prolonged. The process comprises the following steps: (1) removing oil and rust on the surface of a magnet, cleaning the surface; (2) cleaning the surface by glow discharge backwashing in a vacuum coating chamber; (3) preparing a Ti or Cr transition layer by multi-arc ion plating; (4) preparing Al or Al alloy by multi-arc ion plating; (5) preparing an AlN layer by multi-arc ion plating. By adopting the arc ion coating technology and combining the design of a multifunctional layered composite structure coating system, the process has the characteristics of high deposition efficiency, high coating binding force and compactness, simple process, environmental friendliness, no pollution and low cost, and batch large-scale production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of surface protective coatings, in particular to a multi-layer composite protective coating prepared by multi-arc ion plating on the surface of a sintered Nd-Fe-B magnet and a process for preparing a composite protective coating on an Nd-Fe-B magnet by using the multi-arc ion plating technology Layers: Ti or Cr transition layer, corrosion-resistant Al or Al alloy middle layer, and barrier and wear-resistant AlN outer layer. Background technique [0002] NdFeB permanent magnet is the third generation of rare earth permanent magnet after Sm-Co permanent magnet. Due to its excellent magnetic properties and my country's rich neodymium resources, its research, development and production have developed rapidly. However, due to the chemical composition of the material and the powder metallurgy production process, its surface is easily oxidized and corroded in the use environment, resulting in a decrease in its magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/46H01F41/02B32B9/04B32B15/04
Inventor 白雪铠孙世明刘泽
Owner 北京钐元新材料股份有限公司
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