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Neodymium iron boron magnetic material with composite coating layer and preparation method for neodymium iron boron magnetic material

A technology of magnetic materials and composite coatings, applied in coatings, chemical instruments and methods, metal material coating processes, etc., can solve problems such as aluminum nitride and silicon carbide composite coatings that have not been seen, and reduce internal stress. , prolong the service life, the effect of strong bonding force of the membrane base

Active Publication Date: 2014-09-03
黄山旺荣汽车电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are researches to plate Al, Ti / Al and Ni / Al coatings on the surface of NdFeB by vacuum thermal evaporation, but there are no reports of aluminum nitride and silicon carbide composite coatings.

Method used

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  • Neodymium iron boron magnetic material with composite coating layer and preparation method for neodymium iron boron magnetic material
  • Neodymium iron boron magnetic material with composite coating layer and preparation method for neodymium iron boron magnetic material
  • Neodymium iron boron magnetic material with composite coating layer and preparation method for neodymium iron boron magnetic material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of aluminum nitride and silicon carbide composite coating on the surface of NdFeB magnetic material:

[0024] (1) Grind the surface of the NdFeB magnetic material with 400 mesh, 500 mesh, 600 mesh, and 800 mesh sandpaper from coarse to fine; then perform mechanical polishing. Mechanical polishing refers to grinding the The material is polished with diamond paste on a rotating polishing disc covered with flannelette; finally, the surface is cleaned, and the cleaning conditions are: ultrasonic cleaning with acetone and alcohol for 20 minutes respectively.

[0025] (2) Vacuum aluminum nitride plating: put the prepared magnet and target into the chamber, and vacuum the coating chamber through a mechanical pump and a molecular pump. When the background vacuum of the vacuum chamber reaches 2.0×10 -4 At Pa, Ar (flow rate: 20sccm) is introduced as the sputtering gas, the pressure is 0.5Pa, the power is 100W, after pre-sputtering for 15 minutes, N 2 (flow rate 10scc...

Embodiment 2

[0029] (1) Grind the surface of the NdFeB magnetic material with 400 mesh, 500 mesh, 600 mesh, and 800 mesh sandpaper from coarse to fine; The material is polished with diamond paste on a rotating polishing disc covered with flannelette; finally, the surface is cleaned, and the cleaning conditions are: ultrasonic cleaning with acetone and alcohol for 10 minutes respectively.

[0030] (2) Vacuum aluminum nitride plating: put the prepared magnet and target into the chamber, and vacuum the coating chamber through a mechanical pump and a molecular pump. When the background vacuum of the vacuum chamber reaches 2.0×10 -4 At Pa, Ar (flow rate: 20sccm) is introduced as the sputtering gas, the pressure is 0.5Pa, the power is 100W, after pre-sputtering for 15 minutes, N 2 (flow rate 10sccm) as reaction gas, carry out 1 hour aluminum nitride plating to magnet, take out the neodymium iron boron magnetic material of aluminum nitride plating;

[0031] (3) Vacuum silicon carbide plating: Pu...

Embodiment 3

[0034] The preparation method of this embodiment is as embodiment 1, embodiment 2. The vacuum-coated aluminum nitride film on the surface of the prepared NdFeB magnetic material has a thickness of 100 nm, and the silicon carbide film has a thickness of 400 nm.

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Abstract

The invention discloses a neodymium iron boron magnetic material with a composite coating layer. A vacuum aluminum nitride plated thin film and a vacuum silicon carbide plated thin film are attached to the surface of the neodymium iron boron magnetic material in sequence from inside to outside; the vacuum aluminum nitride plated thin film is 100-500nm thick, and the vacuum silicon carbide plated thin film is 200-500nm thick. The surface of the neodymium iron boron magnetic material is provided with aluminum nitride and silicon carbide in vacuum plating manner; after the aluminum nitride is arranged in the vacuum plating manner, the roughness of the plated layer is changed, and the internal stress of the plated film layer is reduced; then the silicon carbide is arranged in the vacuum plating manner, so that a film base is high in bonding force. The corrosion resistance and the acid-alkali resistance of the neodymium iron boron magnetic material are obviously improved; the service life is prolonged, and the conventional market requirement is met.

Description

technical field [0001] The invention relates to a surface protection treatment process of an NdFeB magnetic material, in particular to a NdFeB magnetic material combined with vacuum-plated aluminum nitride and silicon carbide and a preparation method thereof. Background technique [0002] Neodymium iron boron (NdFeB) permanent magnet material has developed into an important functional material due to its excellent magnetic properties, and is widely used in electronics, communication, computer, transportation, medical and other fields. In the past 20 years of research, its magnetic performance indicators have been continuously refreshed. The magnetic energy product has developed from 238kJ m-3 (30MGOe) to the current magnetic energy product greater than 440kJ m-3 (55MGOe), which is the fastest growing magnetic material. . Research on NdFeB magnets has developed most rapidly in Japan. However, the chemical stability of NdFeB alloy is poor, and it is prone to oxidation under ...

Claims

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Application Information

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IPC IPC(8): B32B15/04B32B9/04C23C14/06C23C14/34
Inventor 李合琴陶磊沈炯陈静武
Owner 黄山旺荣汽车电子有限公司
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