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Method for preparing neodymium-iron-boron material through main-auxiliary alloy method

A technology of neodymium iron boron and main alloy, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of reducing Nd content and not involving Nd, DY, Tb, etc., so as to improve coercive force and reduce production cost Effect

Inactive Publication Date: 2013-05-15
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no report on the method of greatly reducing the Nd content in sintered NdFeB materials and reducing the amount of heavy rare earth Dy and Tb elements while increasing the coercive force of the magnet. For example, the Japanese patent No. 99801229. Add Tb, Dy, Cu, Nb and Ga to the alloy to improve the heat resistance of the magnet; the method of the European patent EP1460653A1 also focuses on the high temperature resistance; although the Chinese patent 200510049962.7 gives the double alloy method, it does not involve How to reduce the consumption of Nd, DY and Tb

Method used

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  • Method for preparing neodymium-iron-boron material through main-auxiliary alloy method
  • Method for preparing neodymium-iron-boron material through main-auxiliary alloy method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An inexpensive NdFeB material, formulated as follows:

[0035] Main alloy composition in table 1 embodiment 1:

[0036] the element

Nd

Pr

Fe

B

Dy

Wt%

23.9

5.0

65.26

1.1

2.0

[0037] Auxiliary alloy composition in table 2 embodiment 1:

[0038] the element

Ce

Fe

Tb

co

Al

Cu

Ga

Nb

Wt%

58

34.9

1.5

3.0

1.1

0.8

1.0

1.2

[0039] Next, use the following steps to make NdFeB permanent magnet materials:

[0040] 1) Melting and casting The prepared main alloy and auxiliary alloy are respectively melted evenly in a vacuum induction quick-setting furnace, and then cast into ingots with a thickness of 20mm.

[0041] 2) Powder making Mix the smelted main and auxiliary alloy ingots at a ratio of 90:10, and grind them into powders with a particle size of 3-5 μm through hydrogen crushing, coarse grinding, intermediate crushing and jet mi...

Embodiment 2

[0056] Table 5 Example 2 main alloy composition:

[0057] the element

[0058] Table 6 Example 2 Auxiliary Alloy Components:

[0059] the element

[0060] The main and auxiliary alloys are smelted in a vacuum quick-setting furnace; they are thrown into quick-setting thin strips with a thickness of about 0.2 mm, mixed at a ratio of 92:8, and then made into powders with an average particle size of 3-5 μm by hydrogen crushing, medium crushing and jet milling , Using rubber molding in a magnetic field to form a billet, after isostatic pressing, sinter in a vacuum sintering furnace at 1080°C for 2 hours, and then heat-treat at 900°C×0.5h+580°C×2h to make a billet.

Embodiment 3

[0069] Table 9 Example 3 main alloy composition:

[0070] the element

[0071] Table 10 Example 3 Auxiliary Alloy Components:

[0072] the element

[0073] The main alloy is smelted in a vacuum quick-setting furnace, and it is thrown into a quick-setting thin strip with a thickness of about 0.2mm. After hydrogen crushing, medium crushing and jet milling, it is made into a powder with an average particle size of 3-5μm. The auxiliary alloy is made in a vacuum electric arc furnace. It is smelted into an ingot, and then under the protection of an organic solvent, it is ground into a powder with an average particle size of 3-5 μm by disc milling and ball milling. The main alloy and the auxiliary alloy powder are mixed evenly at a ratio of 80:20, and pressed into a blank by molding in a magnetic field. After isostatic pressing, it is sintered in a vacuum sintering furnace at 1090°C for 3 hours, and then at 900°C×40min+580 ℃ × 2.5h heat treatment made into billet...

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Abstract

The invention relates to a method for preparing a neodymium-iron-boron permanent magnet material through a main-auxiliary alloy method. The method is characterized in that raw materials for preparing the neodymium-iron-boron permanent magnet material consists of a main alloy and an auxiliary alloy, wherein the main alloy comprises the component of RexFe(100-x-z)Bz, and Re is a rare earth element and contains at least one of Nd or Pr; the auxiliary alloy is ReaFe100-a-yMyBb, Re is one or more of La, Ce, Y, Dy, Pr and Gd, and M is one or more of addition elements including Al, Go, Cu, Nb and Ga; the main alloy is mixed in a ratio of u:(100-u), wherein u is a weight percentage and is more than or equal to 70 and less than 100; and the main alloy and the auxiliary alloy with corresponding components are prepared according to component requirements, and then a neodymium-iron-boron alloy is prepared through the steps of smelting, crushing, molding, sintering and tempering processes. The method has the advantages of reducing the material cost and improving the coercive force of a magnet on the premise that the magnetic performance of the neodymium-iron-boron permanent magnet material is not influenced.

Description

technical field [0001] The invention relates to a method for preparing an NdFeB permanent magnet material, in particular to a method for preparing an NdFeB permanent magnet material by an auxiliary alloy method, and belongs to the field of metallurgical materials. Background technique [0002] Since the appearance of NdFeB rare earth permanent magnet materials, because of their high cost performance, they have been widely used in electronics, electricity, machinery, medical equipment and other fields, and are important and indispensable materials in modern high-tech products. [0003] Over the past ten years, my country's sintered NdFeB materials have developed at an average annual growth rate of about 30%. The rapid growth of NdFeB permanent magnet materials and the extensive use of Nd, Pr, Dy and Tb have driven the overall development of the rare earth industry, but have also caused an imbalance in the utilization of rare earth resources in my country. In 2005, my country...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C33/02H01F1/057
Inventor 刘国征赵明静赵瑞金武斌鲁富强况军
Owner BAOTOU RES INST OF RARE EARTHS
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