A kind of high temperature resistant permanent magnet pre-stabilization treatment method

A processing method and permanent magnet technology, applied in the direction of magnets, permanent magnets, magnetic objects, etc., to achieve high magnetic performance, eliminate magnetic flux loss, and maintain the effect of magnetic performance

Active Publication Date: 2019-02-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, the patented method is not suitable for permanent magnets with a temperature exceeding 150°C or even 550°C, and for situations where the size and volume are large and difficult to be pre-stabilized as a whole

Method used

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  • A kind of high temperature resistant permanent magnet pre-stabilization treatment method
  • A kind of high temperature resistant permanent magnet pre-stabilization treatment method
  • A kind of high temperature resistant permanent magnet pre-stabilization treatment method

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Embodiment 1

[0027] In this embodiment, the permanent magnet is a high temperature resistant NdFeB permanent magnet material that can reach 150 ° C, such as figure 2 As shown in a in the figure, when the permanent magnet is used in the device, it is cut into four arc-shaped pieces (outer diameter 100mm, inner diameter 87mm, angle 45°, thickness 8mm) from the blank, and the magnetization direction of the permanent magnet is radial. After 5T magnetic field magnetization, pre-stabilization treatment, built in the inner wall of the ring magnet, in the form of a semi-closed magnetic circuit. The method of pre-stabilizing the permanent magnet is as follows: figure 2 As shown in b in the figure, a single piece of single magnetic pole is adsorbed on an electrical pure iron arc, placed in a vacuum heating furnace and heated to 180°C for 2 hours, and the vacuum degree is maintained at 10 -3 Pa, and then take it out with the furnace cooling. Use a fluxmeter (Model 480, Lake Shore) to measure the ...

Embodiment 2

[0029] In this embodiment, the permanent magnet is a high temperature resistant samarium cobalt permanent magnet material that can reach 300 ° C, such as image 3 As shown in a, when the permanent magnet is used in the device, it is cut into the required shape from the blank, and the size is 10×12×9mm. The magnetization direction of the permanent magnet is along the length direction of 9mm as shown in the figure, and the magnetic field is 10T After magnetization and pre-stabilization treatment, the two magnetic poles are adsorbed by electric pure iron magnetizers to form a closed magnetic circuit. The method of pre-stabilizing the permanent magnet is as follows: image 3 As shown in b, the two magnetic poles of a single piece are adsorbed by electrical pure iron plates, placed in a vacuum heating furnace and heated to 350°C for 2 hours, and the vacuum degree is maintained at 10 -3Pa, and then take it out with the furnace cooling. Use a fluxmeter (Model 480, Lake Shore) to me...

Embodiment 3

[0031] In this embodiment, the permanent magnet is a high temperature resistant samarium cobalt permanent magnet material that can reach 550°C, such as Figure 4 As shown in a, when the permanent magnet is used in the device, it is cut into 12 sector-shaped permanent magnets from the permanent magnet blank, the magnetization direction is radial, and the 10T magnetic field is magnetized. After pre-stabilization treatment, it is assembled into a ring (outer diameter 80mm, inner diameter 72mm, thickness 5mm), both inside and outside have 1J22 magnetizer rings in the form of a closed magnetic circuit. The method of pre-stabilizing the permanent magnet is as follows: Figure 4 As shown in middle b, according to the size of the uniform temperature zone of the heating furnace, multiple fan-shaped permanent magnets are adsorbed together end to end according to the magnetization direction, and the outermost permanent magnets at both ends are adsorbed on the 1J22 magnetic conduction arc...

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Abstract

The invention discloses a pre-stabilization processing method of a high-temperature resistant permanent magnet. The research of a pre-stabilization processing-based protection layer formed for local demagnetize finds out that the pre-stabilization processing method is particularly applicable to a service environment of a permanent magnet in a half-closed loop or a closed loop. The pre-stabilization processing method has keys that a magnetizer is absorbed by a magnetic pole of the permanent magnet and is placed in a thermal treatment furnace, heat preservation is performed for 2 hours or abovein a vacuum environment with a temperature higher than the highest application temperature of the permanent magnet by 30-50 DEG C, and the permanent magnet is naturally cooled to a room temperature with the furnace. By the pre-stabilization processing method, irreversible loss of relatively large flux generated by a traditional pre-stabilization processing method can be reduced even prevented, andmeanwhile, the thermal stability, the time stability and the high magnetism of the permanent magnet are ensured.

Description

technical field [0001] The invention relates to a pre-stabilization treatment method for a high-temperature-resistant permanent magnet. Specifically, for a permanent magnet in a closed magnetic circuit in a service working state, pre-stabilization treatment is performed after its two magnetic poles absorb a magnetizer, thereby avoiding the traditional permanent magnet. The large demagnetization produced by the magnet pre-stabilization treatment method effectively maintains the magnetic properties of the high temperature resistant permanent magnet. Background technique [0002] As a vital functional material, permanent magnets are widely used in energy, transportation, machinery, medical, IT, home appliances and other industries. In recent years, with the rapid development of information technology, automobiles, nuclear magnetic resonance, wind power and special motors With the development, the demand for high-temperature permanent magnets is becoming more and more urgent. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F7/02
CPCH01F7/0273H01F41/0253
Inventor 蒋成保张天丽夏伟
Owner BEIHANG UNIV
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