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Preparation process of Nd-Fe-B permanent magnet and magnet prepared by using same

A preparation process, nd-fe-b technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as low magnetization, hindering application fields, and being limited in several places

Active Publication Date: 2012-09-26
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Tb and Dy brings two serious problems: (1) Most of Tb and Dy enter the grains to form Tb with Fe and B elements 2 Fe 14 B or Dy 2 Fe 14 B compound, the magnetization of this type of compound is much lower than the main phase Nd of NdFeB permanent magnet 2 Fe 14 B, will greatly reduce the remanence and magnetic energy product of the material; (2) Tb, Dy and other heavy rare earth elements are expensive and are scarce resources, and their storage capacity is only 1 / 10 to 1 / 100 of Nd, and the ore veins are limited to several production is very limited
[0004] For example, Patent 1: Japan Vacuum 2007-329250 discloses a method for preparing high-coercivity sintered NdFeB by vacuum evaporation method, and Patent 2: Shin-Etsu Chemical 1838343A discloses a method for preparing high-coercivity sintered NdFeB by coating method However, the disadvantages of these methods are as follows: (1) the equipment is expensive, (2) the material utilization rate is low, (3) there are strict requirements on the thickness of the magnet, and it is difficult to prepare a magnet with a thickness greater than The 10mm magnet hinders its application field, (4) The uniformity of the film is difficult to control and it is difficult to realize industrialization

Method used

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  • Preparation process of Nd-Fe-B permanent magnet and magnet prepared by using same
  • Preparation process of Nd-Fe-B permanent magnet and magnet prepared by using same
  • Preparation process of Nd-Fe-B permanent magnet and magnet prepared by using same

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Select raw materials according to the ingredients shown in Table 1-1, and prepare NdR through the steps of smelting, powder making, molding and sintering a FeMB magnets, processed by wire cutting into 10×10×7 (7 is the c-axis direction, unit mm) magnets; add Tb in the container 2 o 3 powder and nitric acid, Tb 2 o 3 The molar ratio with nitric acid is 1:6, the concentration of nitric acid is 0.5mol / L, stir to make Tb 2 o 3 All dissolved; add ethylenediaminetetraacetic acid solution (EDTA), R b 2 o3 The molar ratio of EDTA and EDTA is 1:2, stirring for 600s to make EDTA and Tb in the solution 3+ A complexation reaction occurs to generate EDTA-Tb 3+ Complex ion, then add NH 4 F solution, R b 2 o 3 with NH 4 The molar ratio of F is 1:10, stir for 600s to obtain a clear solution, immerse the magnet in this solution, keep the solution in the container for 120s, and keep the temperature at 40°C, and react on the surface of the magnet to form uniform TbF 3 Thin fi...

Embodiment 2

[0046] Select raw materials according to the ingredients shown in Table 2-1, and prepare NdR through the steps of smelting, powder making, molding and sintering a FeMB magnets, processed by wire cutting into 10×10×8 (8 is the c-axis direction, unit mm) magnets, add Tb in the container 2 o 3 powder and nitric acid, Tb 2 o 3 The molar ratio with nitric acid is 1:15, the concentration of nitric acid is 6mol / L, stir to make Tb 2 o 3 All dissolved, add ethylenediaminetetraacetic acid solution (EDTA), Tb 2 o 3 The molar ratio with EDTA is 1:10, stir for 100s, make EDTA and Tb in the solution 3+ A complexation reaction occurs to generate EDTA-Tb 3+ Complex ion, then add NH 4 F solution, Tb 2 o 3 with NH 4 The molar ratio of F is 1:2, stir for 100s to obtain a clear solution, immerse the magnet in this solution, keep the solution in the container for 600s, and keep the temperature at 90°C, and react on the surface of the magnet to form uniform TbF 3 Thin film, film thickne...

Embodiment 3

[0052] Select raw materials according to the ingredients shown in Table 3-1, and prepare NdR through smelting, powder making, molding, and sintering steps a FeMB magnets, processed by wire cutting into 10×10×1.5 (1.5 is the c-axis direction, unit mm) magnets, add Tb in the container 2 o 3 powder and nitric acid, Tb 2 o 3 The molar ratio with nitric acid is 1:10, the concentration of nitric acid is 1mol / L, stir to make Tb 2 o 3 All dissolved, add ethylenediaminetetraacetic acid solution (EDTA), Tb 2 o 3 The molar ratio of EDTA and EDTA is 1:3, stirring for 60s to make EDTA and Tb in the solution 3+ A complexation reaction occurs to generate EDTA-Tb 3+ Complex ion, then add NH 4 F solution, Tb 2 o 3 with NH 4 The molar ratio of F is 1:7, stir for 50s to obtain a clear solution, immerse the magnet in this solution, keep the solution in the container for 200s, and keep the temperature at 40°C, and react on the surface of the magnet to form uniform TbF 3 Thin film, film...

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Abstract

The invention provides a preparation process of an Nd-Fe-B permanent magnet and a magnet prepared by using the preparation process, belonging to the field of a magnetic functional material and a preparation technology. The preparation process comprises the following specific steps of: growing an RbX3 thin film on a surface of the magnet by using a chemical bath deposition method; secondly, diffusing elements in the RbX3 thin film, which is plated on the surface of the magnet, to the inside of the magnet through primary heat treatment; and uniformly distributing an element Rb at a crystal boundary position through secondary heat treatment, and removing an unbalanced structure and an internal stress, which are brought by the primary heat treatment in the magnet, wherein a chemical formula of the prepared magnet is RaRbXFeMB. The preparation process provided by the invention has the advantages that the neodymium-iron-boron magnet is prepared by using the chemical bath method, so that the production efficiency can be improved, and the use amount of heavy rare earth in the preparation process of the magnet is reduced. Meanwhile, a high coercive force is obtained under the premise of not reducing magnet remanence and magnetic energy product.

Description

technical field [0001] The invention provides a preparation process of an Nd-Fe-B permanent magnet and the prepared magnet, which belong to the technical field of magnetic functional materials and preparation. Background technique [0002] In order to solve the temperature stability of NdFeB permanent magnets, a lot of research work has been carried out at home and abroad. It has been found that it is an effective method to increase the coercive force of magnets by adding elements. For example, adding a certain amount of heavy rare earth elements Tb, Dy and transition metals Co, Cu, Zr, etc. to the sintered NdFeB master alloy can effectively improve The coercive force of the magnet improves the temperature stability of the magnet. Especially the addition of heavy rare earth elements Tb and Dy can significantly improve the coercive force of the magnet. However, the addition of Tb and Dy brings two serious problems: (1) Most of Tb and Dy enter the grains to form Tb with Fe a...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057C22C1/04
Inventor 闫文龙于敦波李扩社汪浩袁永强李红卫严辉李世鹏罗阳
Owner GRIREM ADVANCED MATERIALS CO LTD
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