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Device and method for improving coercivity of magnet

A coercive force and magnet technology, which is applied in the manufacture of inductors/transformers/magnets, metal material coating processes, electrical components, etc.

Active Publication Date: 2012-06-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods all need to add alloy elements, which will reduce other performance indicators of the magnet to a certain extent, such as magnetic energy product, etc.

Method used

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  • Device and method for improving coercivity of magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] 1.1 Pretreatment of magnets:

[0090] Take 24 sintered NdFeB magnets,

[0091] First use 5% NaOH aqueous solution at 80°C to remove oil for 5 minutes, then use 3% HNO 3 The solution was acid-washed for 3 minutes, and finally ultrasonically cleaned in absolute ethanol for 2 minutes, and then air-dried.

[0092] Place 24 NdFeB magnets on 8 trays in the vacuum chamber, and realize the self-propagation and revolution of the magnets to ensure the uniformity of the magnet processing.

[0093] 1.2 Ion bombardment treatment of magnets:

[0094] The vacuum unit adopts mechanical pump and molecular pump to reduce the vacuum chamber pressure to 3×10 -3 Pa, and then use a beamline ion source to accelerate nitrogen ions to 1kV and bombard the magnet for 10 minutes.

[0095] 1.3 Performance test of the magnet:

[0096] The coercive force of the magnet is tested by the comprehensive physical property measurement system (PPMS), and the test results are as follows figure 1 shown. ...

Embodiment 2

[0098] Example 1 was repeated, except that the corresponding parameters or conditions shown in Table 1 were adopted.

Embodiment 3

[0100] Example 1 was repeated, except that the corresponding parameters or conditions shown in Table 1 were adopted.

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Abstract

The invention discloses a device and a method for improving the coercivity of a magnet. According to the method, at least one main surface of the magnet is subjected to ion bombardment in a vacuum chamber, so that the coercivity of the magnet is improved. The magnet is bombarded by different types of ions with different acceleration voltages, other alloy elements are not required to be added into the magnet, a nonlinear lattice exciton which can be propagated over a long distance can be induced in the magnet, and various defects are introduced to pin magnetic domains, so that the coercivity of the magnet is remarkably improved, and other magnetic performance indexes such as a magnetic energy product and the like are not reduced.

Description

technical field [0001] The invention relates to the field of improving the coercive force of a magnet, in particular to a device and a method for increasing the coercive force of a magnet. Background technique [0002] Sintered NdFeB permanent magnets are widely used in micro motors, magnetic separation equipment, magnetic machinery, nuclear magnetic resonance imaging equipment and other fields due to their high magnetic properties, simple manufacturing process, and low cost. However, as the temperature increases, its coercive force decreases rapidly, and the decrease of coercive force increases the irreversible loss of magnetic flux of the magnet at higher temperature, and the anti-interference ability of the external field is greatly reduced. Coercive force is an important performance parameter of this type of magnet. [0003] Usually, the coercive force of a magnet is affected by many factors, including the preparation process of the magnet, such as powder making process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02C23C8/36
Inventor 李金龙李洪波薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI