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Preparation method of high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet

A radiation orientation, NdFeB technology, used in the manufacture of permanent magnets, magnetic objects, inductors/transformers/magnets, etc., can solve problems such as demagnetization and parts failure

Inactive Publication Date: 2018-06-08
GANZHOU NEW RADIAL MAGNETICS CO LTD GANZHOU CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that the existing NdFeB ring magnets are limited by the performance of the NdFeB permanent magnet material itself, and its normal working temperature is usually below 100 °C
After exceeding this temperature, the NdFeB ring magnet will demagnetize and cause the part to fail

Method used

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  • Preparation method of high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet
  • Preparation method of high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet

Examples

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preparation example Construction

[0029] In order to improve the high temperature resistance performance of the radiation-oriented or multi-pole-oriented NdFeB ring magnet, the embodiment of the present invention provides a high-temperature-resistant radiation-oriented or multi-pole-oriented NdFeB ring magnet preparation method, which specifically includes:

[0030] When preparing the high temperature resistant radiation orientation or multi-pole orientation NdFeB ring magnet of the embodiment of the present invention, the prepared radiation orientation or multi-pole orientation NdFeB ring magnet can be selected, and then the radiation orientation or multi-pole orientation The surface of the NdFeB ring magnet is coated with a coating material containing heavy rare earth elements, and the coated radiation-oriented or multi-pole-oriented NdFeB ring magnet is infiltrated with heavy rare earth elements, that is, the grain boundary Diffusion treatment.

[0031] The inventors found that by infiltrating heavy rare ea...

Embodiment 1

[0042] Take 9 radiation-oriented NdFeB ring magnets with the grade 38SH that have been machined and divide them into three groups of three. The first group: Vacuum sputtering on the surface of the radiation-oriented NdFeB ring magnets One layer of terbium metal coating, the coating weight is 0.5% of the ring weight, the second group: a layer of dysprosium metal coating is vacuum sputtered on the surface of the radiation-oriented NdFeB ring magnet, and the coating weight is the ring weight 0.5% of 0.3%, the third group: a layer of terbium fluoride powder coating is coated on the surface of the radiation-oriented NdFeB ring magnet, and the coating weight is 0.5% of the weight of the ring. Put three groups of coated radiation-oriented NdFeB ring magnets into a vacuum infiltration furnace for infiltration treatment of heavy rare earth elements. The infiltration temperature is 900°C and the infiltration time is 4 hours. 5 hours; the aging-treated radiation-oriented NdFeB ring magne...

Embodiment 2

[0046] Take 9 radially oriented NdFeB ring magnets of the grade 38SH that have been machined, and use the same grouping method, the same coating and the same coating method as in Example 1 to treat three groups of radially oriented NdFeB magnets. Boron ring magnet. Put three groups of coated NdFeB ring magnets into a vacuum infiltration furnace for heavy rare earth element infiltration treatment. The infiltration temperature is 600°C and the infiltration time is 20 hours, and then aging treatment is performed at a treatment temperature of 400°C and a holding time of 20 hours; The aging-treated radiation-oriented NdFeB ring magnet is subjected to gas quenching treatment, and the surface is coated with epoxy resin to obtain a high-temperature-resistant radiation-oriented NdFeB ring magnet.

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Abstract

The embodiment of the invention discloses a preparation method for a high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet. The method comprises the following steps that the surface of the radiation orientation or multi-pole orientation neodymium iron boron annular magnet is coated with a coating material containing heavy rare earth elements, and heavy rare earth element treatment is performed on the coated neodymium iron boron annular magnet; then, aging treatment is performed; gas quenching treatment is performed on the neodymium ironboron annular magnet obtained after aging treatment; then anti-oxidation treatment is performed on the surface, and the high temperature resistance radiation orientation or multi-pole orientation neodymium iron boron annular magnet is obtained. According to the method, the surface of the neodymium iron boron annular magnet is coated with heavy rare earth elements, permeation treatment is performed, the heavy rare earth elements can permeate the crystal boundary of the neodymium iron boron annular magnet, the intrinsic coercive force of the radiation orientation or multi-pole orientation neodymium iron boron annular magnet is improved, the neodymium iron boron annular magnet is not likely to be demagnetized under the high temperature, and the high temperature resistance of the radiation orientation or multi-pole orientation neodymium iron boron annular magnet is improved.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a high-temperature-resistant radiation-oriented or multi-pole-oriented NdFeB ring magnet. Background technique [0002] A permanent magnet is a magnet that can maintain its magnetism for a long time. It is not easy to lose its magnetism and is widely used in industrial production. NdFeB permanent magnets are based on the intermetallic compound Re 2 Fe 14 B-based permanent magnet material. The main components are rare earth (Re), iron (Fe), boron (B). Among them, the rare earth element neodymium (Nd) can be replaced by other rare earth metals such as dysprosium (Dy) and praseodymium (Pr) in order to obtain different properties, and iron can also be replaced by other metals such as cobalt (Co), aluminum (Al), and copper (Cu). . [0003] NdFeB ring magnet is a ring-shaped NdFeB permanent magnet with multi-level orientation or radial orientation...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/026H01F41/0293
Inventor 孟佳宏赵帅李伟华
Owner GANZHOU NEW RADIAL MAGNETICS CO LTD GANZHOU CITY
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