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A preparation method of sintered NdFeB with strong demagnetization coupling between main phase grains

A neodymium-iron-boron, magnetic coupling technology, used in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve problems such as insufficient theoretical values, and achieve the effect of reducing tempering temperature and saving energy

Active Publication Date: 2018-02-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The coercive force of sintered NdFeB is an important parameter. On the one hand, the coercive force of sintered NdFeB will improve other comprehensive properties. On the other hand, the coercive force of sintered NdFeB will be greatly improved. Space, currently less than 30% of the theoretical value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Adding Pr68Cu32 alloy powder and S powder to the main alloy powder at 2:14:1 to prepare a sintered NdFeB magnet with strong demagnetic coupling between the main phase grains

[0023] Nd11.76Fe82.36B5.88 (atomic percent) main alloy and Pr68Cu32 (atomic percent) auxiliary alloy were prepared respectively, and main alloy and auxiliary alloy flakes with thicknesses of 300 μm and 150 μm were prepared by flake ingot technology, and hydrogen blasting and jet milling were used to prepare Prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 3.5 μm and 1.5 μm respectively, add the auxiliary alloy powder with a weight fraction of 4% and the sulfur powder with a weight fraction of 0.5% and a particle size of 50nm in the main alloy powder. Mix the three kinds of powders uniformly in the feeder, and the uniformly mixed powders are oriented and pressed in a 1.8T magnetic field and subjected to 200MPa isostatic pressing. Afterwards, ...

Embodiment 2

[0024] Example 2: (2:14:1+RE-rich phase) adding Pr50Nd20Cu30 alloy powder and S powder to the main alloy powder to prepare a sintered NdFeB magnet with strong demagnetic coupling between the main phase grains

[0025] Nd8.82Pr3.94Fe79.00Co1.86Zr0.5B5.88 (atomic percent) main alloy and Pr50Nd20Cu30 (atomic percent) auxiliary alloy were prepared respectively, and main alloy flakes with a thickness of 300 μm were prepared by the scale ingot casting process, and melt rapid quenching Auxiliary alloy strips with a thickness of 50 μm were prepared by the process, and main alloy powders with an average particle size of 3.0 μm were prepared by hydrogen breaking and jet milling, and auxiliary alloy powders with an average particle size of 1.2 μm were prepared by ball milling. In the main alloy powder Add auxiliary alloy powder with a weight fraction of 5% and sulfur powder with a weight fraction of 1.0% and a particle size of 100nm. Mix the three powders uniformly in a mixer, and the uni...

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Abstract

The invention belongs to the field of rare earth permanent magnet materials, and particularly provides a preparation method of sintered NdFeB with strong demagnetization coupling between main phase grains. It is characterized in that an appropriate amount of sulfur powder and low melting point rare earth-copper aluminum alloy powder are mixed evenly in the NdFeB alloy powder, and the product is obtained after magnetic field pressing, sintering and densification, and heat treatment. The invention is applicable to any NdFeB magnet whose main crystal phase is 2:14:1. Its advantage is that during the sintering process, the sulfur is heated and gasified to realize the gas phase isolation of the magnetic powder particles and the crystal grains, and at the same time, the low melting point rare earth-copper aluminum The alloy has good wettability with the 2:14:1 phase, and the main phase grains of the prepared sintered NdFeB magnets are completely separated, thereby obtaining high coercive force.

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 with strong demagnetization coupling between main phase grains. Background technique [0002] The sintered NdFeB magnet known as the "Magnetic King" has become the core functional material in the fields of electric power, telecommunications, automobiles, computers, biomedicine and household appliances, and is being used in the manufacture of hundreds of kilowatts of electric (or hybrid electric) vehicles. Generators, motors, and permanent magnet motors for wind power generation in the megawatt range. [0003] The coercive force of sintered NdFeB is an important parameter. On the one hand, the coercive force of sintered NdFeB will improve other comprehensive properties. On the other hand, the coercive force of sintered NdFeB will be greatly improved. The space is currently less than 30% of the theoretical value. The main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/16
Inventor 高学绪包小倩汤明辉孙璐
Owner UNIV OF SCI & TECH BEIJING
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