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Rare earth iron-based permanent magnet material and preparation method thereof and vacuum hot press

A permanent magnet material, vacuum hot pressing technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of reducing the anisotropy of the grain surface, reducing the coercive force of the magnet, and reducing the material nucleation field, etc. Achieve the effect of improving corrosion resistance, increasing coercivity, and increasing anisotropy

Pending Publication Date: 2020-12-25
宁波晨洋磁材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the situation of the actual magnet is much more complicated than the ideal situation. For example, the coercive force of the Nd-Fe-B permanent magnet is only 20% to 30% of the anisotropic field.
Due to the defects in the grain boundaries inside the magnet, under the action of the external magnetic field, these regions are the first to form magnetization reversal nuclei, which will lead to the magnetization reversal of the entire magnet, which will lead to the reduction of the material nucleation field, and make the anisotropy of the grain surface. is reduced, thereby reducing the coercive force of the magnet

Method used

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  • Rare earth iron-based permanent magnet material and preparation method thereof and vacuum hot press
  • Rare earth iron-based permanent magnet material and preparation method thereof and vacuum hot press
  • Rare earth iron-based permanent magnet material and preparation method thereof and vacuum hot press

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Effect test

Embodiment 1

[0052] refer to figure 1 , a preparation method of a rare earth iron-based permanent magnet material is as follows:

[0053] S1, the preparation of the magnetic body, comprising the following steps:

[0054] A1, pretreatment: using chemical vapor deposition method, in H 2 - In an Ar mixed atmosphere, methane is used as the carbon source, ammonia gas is used as the nitrogen source, and the oxidation-reduction reaction occurs under the conditions of the temperature of 950 ° C and the pressure of 500 Pa in the reaction furnace. The C atoms and N atoms generated by the cracking of gaseous carbon source and nitrogen source were deposited on the silicon wafer covered with 25 μm thick copper foil to form N-doped graphene film. The N-doped graphene film is then pulverized into N-doped graphene powder.

[0055] A2. Mixing materials: mix B, Dy, Pr, Al, Ga, Cu, Co, Zr, Ho, N-doped graphene and Fe into mixed powder 1 according to the ratio, and the ratio of each chemical composition is...

Embodiment 2

[0076] The difference between this embodiment and Embodiment 1 is that the chemical composition ratio of the rare earth iron-based permanent magnet material is different, and the ratio of each chemical composition is shown in Table 1. In the hot pressing deformation, the temperature of the second hot pressing deformation is 1000°C.

Embodiment 3

[0078] The difference between this embodiment and Embodiment 1 is that the chemical composition ratio of the rare earth iron-based permanent magnet material is different, and the ratio of each chemical composition is shown in Table 1. In the hot pressing deformation, the temperature of the first hot pressing deformation is 650°C, and the temperature of the second hot pressing deformation is 950°C.

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Abstract

The invention discloses a rare earth iron-based permanent magnet material and a preparation method thereof and a vacuum hot press. The rare earth iron-based permanent magnet material comprises a magnet material body and an anti-corrosion layer arranged on the surface of the magnet material body, the magnet material body comprises 3.5-6.5 wt% of B, 1.9-2.7 wt% of Dy, 24-31 wt% of Pr, 0.6-1 wt% of Al, 0.1-0.3 wt% of Ga, 0.1-0.3 wt% of Cu, 1-1.4 wt% of Co, 0.05-0.15 wt% of Zr, 2.7-3.5 wt% of Ho, 3.1-3.7 wt% of N-doped graphene, and the blanace of Fe; and the anti-corrosion layer comprises 23-26 wt% of epoxy resin, 6.7-7.3 wt% of B, 2.3-2.9 wt% of Dy and the balance of Zn. The rare earth iron-based permanent magnet material has the advantage of improving the coercive force of the magnet. The invention further provides a preparation method of the rare earth iron-based permanent magnet material, and the rare earth iron-based permanent magnet material has the advantages that combination of N-doped graphene and Ho is promoted, and grain boundary defects in the magnet are overcome. The invention further provides a vacuum hot press which has the advantages that the temperature uniformity ofall parts of the magnet is improved, and the influence of inconsistent temperature of all the parts on the combination degree of the N-doped graphene and the Ho is reduced.

Description

technical field [0001] The application relates to the field of permanent magnet materials, more specifically, it relates to a rare earth iron-based permanent magnet material, a preparation method and a vacuum hot press. Background technique [0002] Rare earth iron-based permanent magnet materials are based on R 2 Fe 14 Rare earth permanent magnet alloy with intermetallic compounds as the base phase has the best known maximum magnetic energy product and abundant raw material resources. Due to these two overwhelming advantages, rare earth iron-based permanent magnet materials have achieved very fast development and application. [0003] In the related art, the stability of the permanent magnet material refers to the change of the magnetic flux density of the permanent magnet during long-term use after magnetization, which is called the aging of the permanent magnet material. When the residual magnetic induction and coercive force are larger, the permanent magnet has relati...

Claims

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Application Information

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IPC IPC(8): H01F1/057C21D6/00C21D7/13C22C33/04C22C38/00C22C38/06C22C38/10C22C38/14C22C38/16
CPCH01F1/057C22C38/005C22C38/002C22C38/06C22C38/10C22C38/14C22C38/16C22C33/04C21D7/13C21D6/007
Inventor 陈凯浩
Owner 宁波晨洋磁材科技有限公司