Manufacturing method for improving magnetic performance of sintered neodymium-iron-boron magnet

A NdFeB, high magnetic technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve the problems affecting the stability of sintered NdFeB magnetic properties, so as to improve the coercive force of magnets and reduce the reaction , Improve the effect of magnetic stability

Inactive Publication Date: 2014-11-12
NINGBO KETIAN MAGNET +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem affecting the stability of sintered NdFeB magnetic properties, the present invention proposes an improved formula and its manufacturing method

Method used

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  • Manufacturing method for improving magnetic performance of sintered neodymium-iron-boron magnet
  • Manufacturing method for improving magnetic performance of sintered neodymium-iron-boron magnet
  • Manufacturing method for improving magnetic performance of sintered neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Ingredients: Pure Nd, Co, Cu, Al, Fe and DyFe (Dy: 80wt%, Fe: 20wt%), BFe (B: 20wt%, Fe: 80wt%) according to Nd 28.7 Dy 0.5 co 0.5 Cu 0.2 Al 0.2 B 1.0 Fe 余 Ingredients (percentage by weight) for batching;

[0020] 2) Melting: Melting is carried out by the quick-setting process. During casting, the copper / molybdenum roller speed of the melting furnace is set at 1.6m / s, the casting temperature is 1435°C, and the Ar gas pressure is -0.02~-0.03Mpa negative for casting and cooling. pressure protection;

[0021] 3) Hydrogen crushing: put the above-mentioned cast pieces into a hydrogen crushing furnace for hydrogen crushing, the particle size is controlled to be ≤500μm, the hydrogen content of the powder is ≤800PPm, the discharge of the hydrogen crushing powder is protected by Ar gas, and the pressure of the Ar gas flow is 0.01MPa;

[0022] 4) Powder making: Put the above-mentioned hydrogen broken powder into an airflow mill with an argon gas flow pressure of 0.5-0.7...

Embodiment 2

[0034] 1) Ingredients: PrNd (Nd: 75wt%, Pr: 25wt%), pure Co, Cu, Al, Ga, Fe and BFe (B: 20wt%, Fe: 80wt%) according to Nd 22.5 PR 7.5 co 1.0 Cu 0.2 Al 0.4 Ga 0.2 B 1.0 Fe 余 Ingredients (weight percent) for batching:

[0035] 2) Melting: Melting is carried out by the quick-setting process. During casting, the copper / molybdenum roller speed of the melting furnace is set at 1.4m / s, the casting temperature is 1445°C, and the Ar gas pressure is -0.02~-0.03Mpa negative for casting and cooling. pressure protection;

[0036] 3) Hydrogen crushing: put the above-mentioned cast pieces into a hydrogen crushing furnace for hydrogen crushing, the particle size is controlled to be ≤500μm, the hydrogen content of the powder is ≤800PPm, the discharge of the hydrogen crushing powder is protected by Ar gas, and the pressure of the Ar gas flow is 0.01MPa;

[0037] 4) Powder making: put the above-mentioned hydrogen crushing powder into an airflow mill with an argon flow pressure of 0.5-0.7...

Embodiment 3

[0049] 1) Ingredients: pure Nd, Co, Cu, Al, Fe and DyFe (Dy: 80wt%, Fe: 20 wt%), NbFe (Nb: 20wt%, Fe: 80 wt%), BFe (B: 20wt%) , Fe: 80 wt %) by Nd 27.8 Dy 3.2 co 3.0 Cu 0.2 Al 0.2 Nb 0.1 B 1.02 Fe 余 Ingredients (weight percent) for batching:

[0050] 2) Melting: Put the above-mentioned cast pieces into the hydrogen breaking furnace for hydrogen breaking, and adopt the quick-setting process for melting. When casting, the copper / molybdenum roller speed of the melting furnace is set at 1.2m / s, and the casting temperature is 1450°C. Ar gas pressure is -0.02~-0.03Mpa negative pressure protection for cooling and cooling;

[0051] 3) Hydrogen crushing: put the above-mentioned cast pieces into a hydrogen crushing furnace for hydrogen crushing, the particle size is controlled to be ≤500μm, the hydrogen content of the powder is ≤800PPm, the discharge of the hydrogen crushing powder is protected by Ar gas, and the pressure of the Ar gas flow is 0.01MPa;

[0052] 4) Powder makin...

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PUM

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Abstract

A high-magnetism sintered neodymium-iron-boron magnet is characterized by comprising, by weight, 27-31% of rare earth elements, 0.9-1.2% of boron, 0-3.0% of cobalt, 0-2% of adding elements and the balance iron, the rare earth elements comprise two or more of neodymium, praseodymium, dysprosium, terbium and holmium, and the adding elements comprise two or more of aluminum, copper, gallium, niobium, zirconium, titanium and hafnium. A manufacturing method includes the working procedures of batching, smelting, hydrogen breaking, pulverizing, forming and sintering, and argon protection is selected for replacing nitrogen protection in the working procedures from smelting to sintering, so that the content of nitrogen in the sintered neodymium-iron-boron magnet is reduced substantially, the total quantity of the rare earth elements in the magnet is relatively stable, the coercivity of the magnet is improved, and the magnetic performance is kept well. A magnet crystal boundary structure change caused by the nitrogen does not exist in the production process, and the corrosion-resistant capacity of the sintered magnet is improved.

Description

technical field [0001] The invention relates to a sintered NdFeB material and a preparation method thereof, in particular to a preparation method for improving the magnetic performance of the sintered NdFeB material. Background technique [0002] During the preparation of sintered NdFeB materials, impurity elements such as C, O, and N are inevitably introduced. If the content of these impurity elements is too high, the performance of the magnet will deteriorate. Current research is focused on how to reduce and control the oxygen content in sintered NdFeB magnets to ensure the performance of the magnets. Under high temperature conditions, the N element will react with the rare earth element in the sintered NdFeB magnet after the NdFeB powder is thinned, especially when the total amount of rare earth in the magnet is low, the rare earth element in the magnet will react with nitrogen after being oxidized , will cause the content of pure rare earth elements in the magnet to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/16B22F9/04
Inventor 徐峰王育平刘茗
Owner NINGBO KETIAN MAGNET
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