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Method for preparing composite sintered neodymium-iron-boron permanent magnet material added with gadolinium, holmium and yttrium

A technology of composite addition and permanent magnetic materials, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of low working temperature and temperature stability, low actual coercive force, poor corrosion resistance, etc., and achieve rare earth Total content saving, coercive force and working temperature increase, and the effect of improving toughness

Active Publication Date: 2013-03-06
GANZHOU JIATON ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the shortcomings of NdFeB high brittleness, low actual coercive force, low working temperature and temperature stability, and poor corrosion resistance have become the main factors limiting its development and application. Therefore, it is necessary to find alternatives to NdFeB, praseodymium, A new method for preparing NdFeB permanent magnet materials with high comprehensive magnetic properties from rare earth metals such as dysprosium and terbium

Method used

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  • Method for preparing composite sintered neodymium-iron-boron permanent magnet material added with gadolinium, holmium and yttrium
  • Method for preparing composite sintered neodymium-iron-boron permanent magnet material added with gadolinium, holmium and yttrium
  • Method for preparing composite sintered neodymium-iron-boron permanent magnet material added with gadolinium, holmium and yttrium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a sintered NdFeB permanent magnet material compounded with Gd, Ho, and Y, according to the formula described in the following table 1-1, a batch of 100Kg is carried out:

[0027] Table 1-1

[0028] Element

[0029] Among them, the mass percentage of Nd and Pr in the raw material is 75:25; the phase forms of Dy, B, and Nb are iron alloys with iron content of 25.0wt.%, 80.5wt.%, and 34.7wt.%, respectively; Gd, Ho , Y is compounded in the form of iron alloy with an iron content of 25.0wt.%, and its mass percentage is Gd:Ho:Y=40:50:10; the remaining Fe is added in pure iron metal.

[0030] Then adopt the following process steps to manufacture NdFeB rare earth permanent magnet materials:

[0031] The prepared raw materials are put into a vacuum melting furnace for melting to form molten alloy liquid. The melting temperature is 1500°C, and then the molten alloy liquid is rapidly solidified into master alloy flakes with a thickness of 0.3-0.5...

Embodiment 2

[0041] According to the formula described in the following table 2-1 and the steps in embodiment 1, carry out batching 100Kg once, wherein Gd: Ho: Y=50: 30: 20; other conditions are the same as embodiment 1.

[0042] table 2-1

[0043] Element

[0044] The prepared raw materials are put into a vacuum melting furnace for melting to form a molten alloy liquid from the raw materials. The melting temperature is 1550 ° C, and then the melted average particle size is that the alloy liquid is rapidly solidified into a master alloy sheet with a thickness of 0.3-0.5 mm; through Hydrogen crushing and jet milling crush master alloy flakes into fine powder with an average particle size of 3-5 μm; 100Kg master alloy powder and Gd with an average particle size of 0.5 μm 2 o 3 0.2Kg, Ho 2 o 3 0.6Kg, Y 2 o 3 0.7Kg, Cu 2 O 0.3Kg is uniformly mixed in a powder mixer; the uniformly mixed fine powder is pressed into a compact by molding and isostatic pressing; the compact is s...

Embodiment 3

[0054] According to the formula described in the following table 3-1 and the steps in embodiment 1, carry out batching 100Kg once, wherein Gd: Ho: Y=60: 30: 10; other conditions are the same as embodiment 1.

[0055] Table 3-1

[0056] Element

[0057] The prepared raw materials are put into a vacuum melting furnace for melting to form a molten alloy liquid from the raw materials. The melting temperature is 1350 ° C, and then the melted average particle size is that of the alloy liquid, which is quickly solidified into a master alloy sheet with a thickness of 0.3-0.5 mm; through Hydrogen crushing and jet milling crush master alloy flakes into fine powders with an average particle size of 3-5 μm; add 100Kg of master alloy powder and Gd with an average particle size of 0.5 μm to the mixer 2 o 3 0.1Kg, Ho 2 o 3 0.5Kg, Y 2 o 3 0.4Kg, Cu 2 O 0.5Kg for secondary batching and powder mixing; the uniformly mixed fine powder is pressed into a compact by molding and is...

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Abstract

The invention provides a method for preparing a composite sintered neodymium-iron-boron permanent magnet material added with gadolinium, holmium and yttrium. The method includes the steps of primary batching, fusion casting, milling, secondary batching, powder mixing, forming, sintering and heat treatment, wherein in the primary batching step, iron alloy added with three rare earth elements of the gadolinium, the holmium and the yttrium is composited, and in the secondary batching step, oxide added with the three rare earth elements of ultrafine gadolinium, holmium and yttrium and cuprous oxide powder are composited. By the method, the relative surplus and cheap gadolinium, holmium and yttrium can be used for partially substituting for rare earth elements of neodymium, praseodymium or dysprosium, and accordingly neodymium, praseodymium or dysprosium consumption can be decreased by 10-30wt.%. Besides, Curie temperature and coercivity force of the prepared neodymium-iron-boron permanent magnet material are increased, corrosion resistance is enhanced, operating temperature and toughness are increased, and processability is improved.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular, the invention relates to a method for preparing sintered NdFeB rare earth permanent magnet materials compounded with gadolinium, holmium and yttrium. Background technique [0002] NdFeB rare earth permanent magnet material, commonly known as "Permanent Magnet King", is the third generation of permanent magnet material developed in the early 1980s. It has the characteristics of small size, light weight and strong magnetism, as well as energy saving, material saving and environmental protection. It has been widely used in many fields such as computers and peripheral equipment, communication equipment, electronics and electroacoustic equipment, machinery, medical treatment, new energy electric bicycles and automobiles, aviation and aerospace, wind power generation, etc. It is the fastest growing magnetic material. A kind of, the application prospect is ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08C22C1/03B22F3/16
Inventor 陈久昌曾青云姚清霞邱建民刘翼萍
Owner GANZHOU JIATON ADVANCED MATERIALS
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