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Cold-heat circulation aging treatment method for increasing magnetic stability of permanent magnets

A technology of cooling and heating cycle and aging treatment, applied in the direction of permanent magnet, inductor/transformer/magnet manufacturing, electrical components, etc., can solve insufficient problems, achieve convenient operation, improve radiation resistance magnetic stability, and improve magnetic stability Effect

Active Publication Date: 2012-07-11
西安西工大思强科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through such aging treatment, part of the structure inside the permanent magnet and the unstable structure of the magnetic domain can be eliminated, but it is still insufficient, resulting in changes in the magnetic properties of the magnetic device during use.

Method used

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  • Cold-heat circulation aging treatment method for increasing magnetic stability of permanent magnets
  • Cold-heat circulation aging treatment method for increasing magnetic stability of permanent magnets
  • Cold-heat circulation aging treatment method for increasing magnetic stability of permanent magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Aging treatment of N35SH permanent magnets with a temperature of -60°C to 140°C:

[0026] Saturation magnetize 50 D4mm×20mm axially magnetized iron-boron N35SH permanent magnets, place the saturated magnets on a non-magnetic copper, aluminum or austenitic stainless steel bottom plate, and keep two adjacent The interval between the permanent magnets is 5 times the length of the magnetization direction of the permanent magnets, and the specific interval is 100mm. Then put the permanent magnets and the non-magnetic bottom plate together in a high and low temperature box, and freeze them at -70°C for 60 minutes. Then heat the temperature of the high and low temperature box to 150°C at a heating rate of 5°C / min, keep it warm for 60 minutes, and finally cool down to room temperature naturally, complete a cooling and heating cycle aging treatment, and take out the permanent magnet.

Embodiment 2

[0028] Aging treatment of N35EH permanent magnets at temperatures between -60°C and 200°C:

[0029] Saturation magnetize 20 cylindrical NdFeB N35EH permanent magnets magnetized along the diameter direction of D4mm×20mm, place the saturated magnetization on a non-magnetic copper, aluminum or austenitic stainless steel bottom plate, and keep The interval between two adjacent permanent magnets is 10 times the length of the magnetization direction of the permanent magnets, and the specific interval is 200mm. Then put the permanent magnets and the non-magnetic bottom plate into the high and low temperature box together, under the condition of -60℃ Freeze for 30 minutes, then heat the temperature of the high and low temperature box to 250 ° C at a temperature increase rate of 10 ° C / min and keep it warm for 30 minutes. gas) so that the mass concentration of oxygen in the high and low temperature box is not higher than 2%, and finally naturally cool to room temperature, complete a ...

Embodiment 3

[0031] Aging treatment of N35 permanent magnets with a temperature of -10°C to 50°C:

[0032] Saturation magnetize 15 cylindrical NdFeB N35 permanent magnets with L / D=0.7, place the saturated magnets on non-magnetic copper, aluminum or austenitic stainless steel bottom plate, and keep them adjacent The distance between the two permanent magnets is 8 times the length of the magnetization direction of the permanent magnets. Then put the permanent magnets and the non-magnetic bottom plate together in a high-low temperature box, and freeze them for 120 minutes at a temperature of -20°C. The heating rate of ℃ / min is to heat the temperature of the high and low temperature box to 60 ℃, and keep it warm for 240 minutes. Thermal cycle aging treatment, take out the permanent magnet.

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Abstract

The invention discloses a cold-heat circulation aging treatment method for increasing magnetic stability of permanent magnets. The method comprises the following steps of: putting one or more permanent magnets magnetized in a saturated manner on a non-magnetic bottom plate; then putting in a high-low temperature chamber, and freezing at minus 70 DEG C to minus 20 DEG C for 30-120 min; then, heating the high-low temperature chamber to 60-250 DEG C at the temperature increasing rate of 1-10 DEG C / min, and keeping the temperature for 30-240 min; and finally, naturally cooling to room temperature, and completing cold-heat circulation aging treatment. By adopting the method disclosed by the invention, total loss, irreversible loss, reversible loss and reversible temperature coefficients when temperature of the permanent magnets is changed can be effectively eliminated or reduced; and heat stability, time stability, magnetic stability and radiation-resistant magnetic stability of the permanent magnets under a vibration condition can be increased.

Description

technical field [0001] The invention belongs to the technical field of permanent magnets, and in particular relates to a cooling and heating cycle aging treatment method for improving the magnetic stability of permanent magnets. Background technique [0002] People hope that the magnetism of permanent magnets and permanent magnet devices will be as stable as possible under environmental conditions such as certain use time, vibration, diamagnetic field, high and low temperature, energy rays, and altitude changes. If the magnetic field is unstable, it will affect the sensitivity of the device. , accuracy, stability and reliability. Therefore, ensuring good stability of magnetic properties is our ultimate goal. [0003] The reality is that the magnetism of permanent magnets and their permanent magnet devices will change more or less during use. This change is divided into reversible change and irreversible change. The magnetism is also restored under the same environmental co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F7/02
Inventor 邹光荣
Owner 西安西工大思强科技股份有限公司
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