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Low-cost rare-earth-free magnetic material and preparation method thereof

A magnetic material and low-cost technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of high price of NdFeB permanent magnet materials, and improve the grain boundary microstructure, spherical shape Good degree, smooth surface effect

Active Publication Date: 2019-10-25
宁波金科磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the heat resistance of NdFeB permanent magnet materials, the common method used in the industry is to add expensive rare earth elements (such as dysprosium and terbium), which directly leads to high prices of NdFeB permanent magnet materials.

Method used

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  • Low-cost rare-earth-free magnetic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the low-cost rare-earth-free magnetic material in this embodiment comprises the following steps:

[0029] (1) Prepare the raw material according to the chemical formula of the following magnetic material: Fe bal B 1.1％ Ga 0.3％ , smelting the raw materials into alloy liquid;

[0030] (2) The alloy liquid is made into magnetic powder with a particle size range of 7-15 μm by gas atomization powder production method. The atomization medium used in the gas atomization powder production method is argon gas, and the flow rate of argon gas is 8m 3 / s, the argon flow rate is 9m / s, and the atomization pressure is 10MPa;

[0031] (3) Orient the magnetic powder in a magnetic field with a strength of 1.5T, press it for 3 seconds under a pressure of 12 MPa, and then perform an isostatic pressing treatment under a pressure of 130 MPa for 30 seconds to form a green body;

[0032] (4) Put the green body in the sintering furnace, first raise the temperature ...

Embodiment 2

[0034] The preparation method of the low-cost rare-earth-free magnetic material in this embodiment comprises the following steps:

[0035] (1) Prepare the raw material according to the chemical formula of the following magnetic material: Fe bal B 1％ Al 0.3％ Cu 0.2％ , smelting the raw materials into alloy liquid;

[0036] (2) The alloy liquid is made into magnetic powder with a particle size range of 7-13 μm by gas atomization powder production method. The atomization medium used in the gas atomization powder production method is argon gas, and the flow rate of argon gas is 9m 3 / s, the argon flow rate is 11m / s, and the atomization pressure is 12MPa;

[0037] (3) Orient the magnetic powder in a magnetic field with a strength of 1.7T and press it under a pressure of 10MPa for 5s to form it, and then perform an isostatic pressing treatment under a pressure of 120MPa for 50s to form a green body;

[0038] (4) Put the green body in the sintering furnace, first raise the temper...

Embodiment 3

[0040] The low-cost magnetic material in this embodiment is composed of the low-cost rare-earth-free magnetic material in Embodiment 1 with a mass percentage of 20% and the NdFeB magnetic material with a mass percentage of 80%.

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Abstract

The invention relates to a low-cost rare-earth-free magnetic material and a preparation method thereof, and belongs to the technical field of magnetic materials. The chemical formula of the low-cost rare-earth-free magnetic material is shown in percentage by weight: FebalB0.9-1.1%M1xM2y, wherein M1 is one or two of Ga and Al; M2 is one or more of Cr, Mn, Co, Ni, Cu, Ti, Zr, Nb, Mo, Tc, Ru, Rh, Pdand Ag; x ranges from 0.01% to 10%, and y ranges from 0% to 5.8%. The low-cost rare-earth-free magnetic material does not contain rare earth elements, is low in cost, has the magnetic performance similar to that of an existing neodymium-iron-boron magnetic material, and can be independently manufactured into a magnet for use or matched with the neodymium-iron-boron magnetic material to be manufactured into a double-phase coupling magnet for use.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and relates to a low-cost rare-earth-free magnetic material and a preparation method thereof. Background technique [0002] As an ancient and young basic functional material with a wide range of uses, the application of magnetic materials has penetrated into all aspects of the national economy and national defense during the long-term development process. It is indispensable for modern life and exists in military equipment, In electroacoustic devices, motors, generators, computer hard disk drives, voice coil motors, nuclear magnetic resonance imaging instruments, microwave communication technology, controllers, instruments and other devices and equipment that require permanent magnetic fields, the magnetic material itself has also been greatly improved. development of. Magnetic materials include ferrite, rare earth permanent magnet (rare earth cobalt, neodymium iron boron, etc.), alni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/047H01F1/057H01F41/02
CPCH01F1/047H01F1/057H01F41/0266
Inventor 周高峰鲍志林
Owner 宁波金科磁业有限公司