Method for preparing sintered Nd-Fe-B permanent magnet material with intergranular Nd-rich phase replaced

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem of not providing magnetic properties, and achieve the effect of simple operation, cost reduction, and rare earth resource saving.

Active Publication Date: 2014-01-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the neodymium-rich phase itself does not provide magnetic properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Sintered NdFeB magnet with Cu20Al80 alloy phase instead of Nd-rich phase

[0021] 1. Add Nd 2 Fe 14 B alloy ingot crushed to produce 3.5μm powder particles;

[0022] 2. Mix 1.5% (volume fraction) Cu20Al80 alloy powder (average particle size 30nm) with NdFeB powder;

[0023] 3. Orientation pressing and isostatic pressing of the mixed powder under a 1.8T magnetic field;

[0024] 4. Vacuum sinter the compact at 1090°C for 4 hours;

[0025] 5. Temper the sintered magnet at 850°C and 500°C for 2 hours respectively;

[0026] 6. Get the product.

Embodiment 2

[0027] Example 2: Sintered NdFeB magnet with Cu40Al60 alloy phase instead of Nd-rich phase

[0028] 1. Add Nd 2 Fe 14 B alloy ingot crushed to produce 3.8μm powder particles;

[0029] 2. Mix 2% (volume fraction) of Cu40Al60 alloy powder (average particle size 50nm) with NdFeB powder;

[0030] 3. Orientation pressing and isostatic pressing of the mixed powder under a 1.8T magnetic field;

[0031] 4. Vacuum sinter the compact at 1080°C for 3 hours;

[0032] 5. Temper the sintered magnet at 900°C and 500°C for 2.5 hours respectively;

[0033] 6. Get the product.

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Abstract

The invention belongs to the field of rare earth permanent magnetic materials, and particularly provides a sintered Nd-Fe-B permanent magnet material with an intergranular Nd-rich phase replaced and a preparation method thereof. The sintered Nd-Fe-B permanent magnet material with the intergranular Nd-rich phase replaced is characterized in that the intergranular Nd-rich phase in the sintered Nd-Fe-B material is replaced by a grain boundary phase not containing Nd, and the grain boundary phase has the following characteristics that no magnetism exists, the melting point is 500-900 DEG C so that liquid state sintering can be facilitated, the proportion is 2:14:1, and main phase wettability is good. The grain boundary phase can be made of Al-Cu (the Cu content range is 5-50at%) alloy. The preparation method includes the steps that Nd-Fe-B main alloy ingots with the closely even distribution proportion being 2:14:1 are crushed to be manufactured into powder particles of 3-5 micrometers, Al-Cu alloy powder with the volume fraction being smaller than 5% and the average particle size being smaller than 100nm is added and evenly mixed, and through magnetic field profiling, isostatic pressing and sintering densification, products are obtained after heat treatment ultimately. The sintered Nd-Fe-B permanent magnet material with the intergranular Nd-rich phase replaced and the preparation method thereof have the advantages that conventional metal Al and Cu are used for replacing the rare earth element Nd, the cost of raw materials can be greatly lowered, and rare earth resources are saved. The preparation method is simple to operate and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a method for preparing sintered NdFeB permanent magnet materials in which the Nd-rich phase at the grain boundary is replaced Background technique [0002] Since the sintered NdFeB permanent magnet was first invented by Sumitomo Metal Corporation in Japan in 1983, because it has higher remanence and magnetic energy product than other permanent magnets, good dynamic recovery characteristics and high performance-price ratio, it is widely used in high-tech industries. It has been widely used in the field and has become the core functional material in the fields of electric power, telecommunications, automobiles, computers, biomedicine, and household appliances. It is being used in the manufacture of generators, motors, and Manufacture megawatt-scale wind power permanent magnet motors. [0003] All sintered NdFeB magnets have high permanent magnetic properties, o...

Claims

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Application Information

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IPC IPC(8): B22F3/16H01F1/057H01F1/08
Inventor 包小倩高学绪朱洁李纪恒
Owner UNIV OF SCI & TECH BEIJING
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