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Neodymium-iron-boron magnetic steel with coating and preparation methods thereof

A neodymium-iron-boron and coating technology is applied in the field of neodymium-iron-boron magnets and their preparation, which can solve problems such as easy conduction, achieve good insulation performance, solve conduction problems, and have the effects of low production cost

Inactive Publication Date: 2011-08-31
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the technical problem that the NdFeB magnets in the prior art are easy to conduct electricity in the slots of the silicon steel laminations

Method used

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Examples

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Effect test

preparation example Construction

[0024] Simultaneously, the present invention provides a kind of method for preparing above-mentioned neodymium-iron-boron magnet with coating, and this preparation method comprises following concrete steps:

[0025] 1) prepare the pellets of the fluorine paint with polytetrafluoroethylene as matrix resin; in this step, the fluorine paint with polytetrafluoroethylene as matrix resin can be PTFE, FEP, PFA or ETFE coating, the fluorine paint of these fluorine paints The chemical structure and properties have been described in detail above, and will not be repeated here.

[0026] 2) vibrate, pickle, derust, ultrasonically clean and dry the sintered NdFeB substrate; in this step, the method for cleaning the NdFeB substrate is known to those skilled in the art, and its effect is to make the NdFeB substrate The boron matrix is ​​closely bonded to the fluorine coating.

[0027] 3) Spraying the fluorine paint on the surface of the NdFeB substrate under the condition of 250°C to 280°C ...

Embodiment 1

[0037] 1) prepare the pellets of PTFE (polytetrafluoroethylene) coating;

[0038] 2) Vibrate, pickle, derust, ultrasonically clean and dry the sintered NdFeB substrate so that it can be tightly combined with the PTFE coating;

[0039] 3) The PTFE coating is sprayed at 260° C. by means of thermal spraying to form a PTFE protective coating on the surface of the NdFeB substrate, and the thickness of the PTFE coating obtained by thermal spraying is 20 μm.

[0040] Through the above steps, the PTFE-coated NdFeB magnet of this embodiment is obtained.

Embodiment 2

[0042] 1) preparing pellets of FEP (fluorinated ethylene propylene copolymer) coating;

[0043] 2) Vibrate, pickle, derust, ultrasonically clean and dry the sintered NdFeB substrate so that it can be closely combined with the FEP coating;

[0044] 3) The FEP coating is sprayed at 280° C. by means of thermal spraying to form a FEP protective coating on the surface of the NdFeB substrate, and the thickness of the FEP coating obtained by thermal spraying is 10 μm.

[0045] Through the above steps, the NdFeB magnet with FEP coating of this embodiment is obtained.

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Abstract

The invention provides neodymium-iron-boron magnetic steel with a coating. The neodymium-iron-boron magnetic steel comprises a neodymium-iron-boron substrate and the coating arranged on the surface of the neodymium-iron-boron substrate, wherein the coating is formed by a fluorine coating taking polytetrafluoroethylene as substrate resin, and the content of tetrafluoroethylene in the fluorine coating is over 75 weight percent. The invention also provides two preparation methods of the neodymium-iron-boron magnetic steel with the coating. The coating of the neodymium-iron-boron magnetic steel is prepared by a thermal spraying process or a coating and baking process respectively. The surface coating of the neodymium-iron-boron magnetic steel is prepared from the fluorine coating taking the polytetrafluoroethylene as the substrate resin, so that the neodymium-iron-boron magnetic steel has high insulating property, the problem of electric conduction of the neodymium-iron-boron magnetic steel can be effectively solved, and eddy-current loss is reduced; meanwhile, the neodymium-iron-boron magnetic steel has high corrosion resistance and high-temperature stability, is not corroded by an external environment, and can stably work in the process that an electric motor is operated.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a coated NdFeB magnet and a preparation method thereof. Background technique [0002] In 1983, Japan's Sumitomo Metal Corporation first invented NdFeB permanent magnet materials. Since its inception, NdFeB permanent magnet materials have high magnetic energy product, high coercivity, good mechanical properties, relatively low price and sufficient The advantages of resource reserves have been widely used in automobiles, computers, electronics, machinery, energy, medical equipment and other fields. In recent years, new energy technology and green environmental protection concepts have attracted more and more attention. In the automotive field, electric vehicles and hybrid vehicles are the representatives of this technical concept, and electric motors are the power components of electric vehicles and hybrid vehicles. Its importance is obvious; it is precisely because of the above-...

Claims

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Application Information

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IPC IPC(8): B32B33/00C09D127/18C23C4/04
Inventor 宫清杜鑫梁概师邓晓霞丁大勇
Owner BYD CO LTD
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