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Method for preparing anisotropic nanocrystalline rare-earth permanent magnet block material

An anisotropic, rare-earth permanent magnet technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of limited cooling capacity of copper molds, large difference in crystallization temperature, weak amorphous formation ability, etc., to achieve Good comprehensive permanent magnetic properties and mechanical strength, simple production process, and low process consumption

Inactive Publication Date: 2012-07-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cooling ability of the copper mold is limited, and the amorphous formation ability of rare earth permanent magnet alloys such as Nd-Fe-B and Sm-Co is weak, so the non-magnetic properties of the alloy have to be improved by increasing the boron content or adding a large amount of non-magnetic elements. crystal forming ability, thus sacrificing the magnetic properties of the magnet
On the other hand, the crystallization temperature of various magnetic phases in the material differs greatly, and high requirements are placed on the control of heat treatment equipment and process parameters during crystallization under a magnetic field, otherwise incomplete crystallization or abnormally long grains will easily occur. large phenomenon, resulting in a decrease in the magnetic properties of the magnet

Method used

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  • Method for preparing anisotropic nanocrystalline rare-earth permanent magnet block material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using Nd, Pr, Fe, Y, Cr, Co, Si, Zr and B with a purity of 99.9wt% as raw materials, according to Nd 9 PR 1.5 Fe 61 Y 0.5 Cr 0.5 co 9 Si 1 Zr 2 B 15.5 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -5 Pa, then pass through 1.1×10 5The high-purity argon gas of Pa is smelted 6 times under the protection of argon gas to ensure the ingot with uniform composition. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of alloying elements during the smelting process. Next, put the alloy ingot into a quartz glass tube with a small hole (0.7 mm in diameter) at the bottom, and place it in a vacuum spray-casting furnace with a DC electric field and a DC magnetic field device. The inner cavity of the quartz tube is 1.5mm (thickness) × 25mm (width) × 25mm (length) water-cooled copper mold. Vacuum until the vacuum degree in the spray casting furnace cavity is 10 -5 Pa...

Embodiment 2

[0023] Using Nd, Dy, Fe, Co, Cr, Zr, Ti, Ga, B and C with a purity of 99.9wt% as raw materials, according to Nd 11 Dy 1 Fe 55 co 12 Cr 1 Zr 1 Ti 0.5 Ga 0.5 B 17.5 C 0.5 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -5 Pa, then pass through 1.1×10 5 The high-purity argon gas of Pa is smelted 6 times under the protection of argon gas to ensure the ingot with uniform composition. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of alloying elements during the smelting process. Next, put the alloy ingot into a quartz glass tube with a small hole (0.7 mm in diameter) at the bottom, and place it in a vacuum spray casting furnace with a DC electric field and a DC magnetic field device, and place a water-cooled copper mold at the lower end of the quartz tube , the inner diameter of the copper mold cavity is 2mm, and the length is 50mm. Vacuum until the vacuum degr...

Embodiment 3

[0025] Using Nd, La, Dy, Fe, Co, Zr, Ti, Mo and B with a purity of 99.9wt% as raw materials, according to (Nd 0.9 La 0.1 ) 12 Dy 1 Fe 63 co 10 Zr 1 Ti 2 Mo 1 B 10 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -5 Pa, then pass through 1.1×10 5 The high-purity argon gas of Pa is smelted 6 times under the protection of argon gas to ensure the ingot with uniform composition. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of alloying elements during the smelting process. Next, put the alloy ingot into a quartz glass tube with a small hole (0.7 mm in diameter) at the bottom, and place it in a vacuum spray casting furnace with a DC electric field and a DC magnetic field device, and place a water-cooled copper mold at the lower end of the quartz tube , the inner diameter of the copper mold cavity is 1.5mm, and the length is 50mm. Vacuum until the vacuum degree i...

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Abstract

The invention discloses a method for preparing an anisotropic nanocrystalline rare-earth permanent magnet block material, which includes: firstly, preparing an alloy ingot by the vacuum smelting process; secondly, melting the alloy ingot and injecting an external direct-current electric field to the melt to realize direct-current inoculation process; thirdly, preparing an anisotropic nanocrystalline rare-earth permanent magnet material by the rapid copper mould solidification process under action of an external direct-current magnetic field; and finally processing the material in heat properly according to specific conditions. The anisotropic nanocrystalline rare-earth permanent magnet block material prepared by the method has the advantages of evident magnetic anisotropy, high density and fine comprehensive permanent magnetic performance. The method is simple in procedure, convenient in operation and low in processing consumption.

Description

technical field [0001] The invention belongs to the field of magnetic material preparation, and in particular relates to a method for preparing bulk anisotropic nanocrystalline rare earth permanent magnet materials. Background technique [0002] Rare earth permanent magnet materials refer to permanent magnet materials based on intermetallic compounds formed by rare earth and transition metals (mainly Fe and Co), and NdFeB alloys are typical representatives. Nanocrystalline permanent magnet materials have a higher theoretical magnetic energy product than microcrystalline permanent magnet materials. For example, the nano-two-phase permanent magnet material is composed of a nanocrystalline hard magnetic phase and a soft magnetic phase, and the theoretical value of the magnetic energy product of the anisotropic nano-two-phase permanent magnet material can reach 1000kJ / m 3 , and the rare earth content is low, the price is cheap, and it is expected to become a new generation of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/06H01F41/02B22D27/02
Inventor 王晨陈君君李媛罗朝林汪炜洪志军
Owner FUZHOU UNIV
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