Magnetic material for high frequency wave, and method for production thereof

A magnetic material, high-frequency technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of high permeability, eddy current loss, high resistivity, and achieve high permeability and low eddy current loss. Effect

Inactive Publication Date: 2010-03-10
TOKYO INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0044] The inventors of the present invention were able to solve the backlash characteristics of conventional magnetic materials, high magnetic permeability, and high resistivity, solve the above-mentioned problem of eddy current loss, and have excellent electromagnetic properties that combine the advantages of both metal-based magnetic materials and oxide magnetic materials. As a result of intensive research on new high-frequency magnetic materials, it was found that by using a nitride-based rare-earth-iron-nitrogen-based magnetic material that is different from conventionally used oxide magnetic materials or metal-based magnetic materials, it can be used as a The present invention was completed by controlling the composition, crystal structure, magnetic anisotropy direction and particle size, and establishing the production method of the excellent function of the magnetic material for high frequency

Method used

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  • Magnetic material for high frequency wave, and method for production thereof
  • Magnetic material for high frequency wave, and method for production thereof
  • Magnetic material for high frequency wave, and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0305] Using Nd with a purity of 99.9% and Fe with a purity of 99.9%, they were dissolved and mixed in an arc melting furnace under an argon atmosphere, and then, an ingot with a thickness of 5 mm was produced by a direct casting method. Then annealed at 1030°C for 20 hours in an argon environment, and then polished the surface after gradually cooling to prepare Nd 11.6 Fe 88.4 raw material alloys.

[0306] The raw material alloy was crushed with a jaw crusher, and then pulverized with a winch mill in an argon atmosphere, and the particle size was adjusted by vibration to obtain a powder with an average particle diameter of about 60 μm. Put the Nd-Fe raw material alloy powder into a horizontal tubular furnace, and heat it for 1 hour at 420°C in a mixed airflow with an ammonia partial pressure of 0.35atm and a hydrogen partial pressure of 0.65atm, and adjust it to Nd with an average particle size of about 30μm. 10.1 Fe 76.7 N 13.2 composition. The magnetization value of th...

Embodiment 2

[0321] The composition that embodiment 1 obtains is Nd 10.1 Fe 76.7 N 13.2 Coarse powder, in argon with an oxygen partial pressure of 1%, is subjected to a rotary ball mill, and after surface treatment is carried out in a ferric chloride solution of pH 6.2, the surface oxidation treatment is carried out while adjusting the pH to obtain a particle with an average particle size of 6 μm. Nd 8.0 Fe 60.8 N 10.6 h 7.8 o 12.8 Rare earth-iron-nitrogen (-hydrogen-oxygen) magnetic materials.

[0322] 12% by mass of epoxy resin was mixed with this material, molded into a size of 10×5×1.3 mm at a molding pressure of 1 GPa in a static magnetic field of 1.2 MA / m (uniaxial magnetic field orientation), and cured at 150° C. for 2 hours. The obtained density was 5.2 and the volume fraction of the magnetic material was 62 volume%.

[0323] The maximum value of the imaginary number term of the complex relative magnetic permeability when the magnetic field orientation direction of the rare...

Embodiment 3 and 4

[0326] Use Nd with a purity of 99.9% and Fe with a purity of 99.9%, dissolve and mix them in a high-frequency melting furnace under an argon atmosphere, and then anneal at 950°C for 100 hours in an argon atmosphere, and then grind the surface after gradually cooling to prepare a composition of Nd 10.5 Fe 89.5 raw material alloys.

[0327] The raw material alloy was pulverized with a jaw crusher, and then pulverized with a pin mill in an argon atmosphere, and then the particle size was adjusted with a sonic classifier to obtain a powder with an average particle diameter of 50 μm.

[0328] Put the Nd-Fe raw material alloy powder into a horizontal tubular furnace, heat treatment at 420°C in a mixed flow of ammonia partial pressure of 0.35atm and hydrogen partial pressure of 0.65atm for 2 hours, then, at 400°C, under argon gas Medium annealing for 30 minutes, adjusted to Nd with an average particle size of 25 μm 9.1 Fe 77.3 N 13.6 composition.

[0329] The magnetization valu...

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Abstract

Disclosed is a magnetic material for a high frequency wave which has high magnetic permeability and small eddy-current loss, particularly a magnetic material for a high frequency wave which can be used suitably in an information device which works in a high frequency field of 1 GHz or higher. Specifically disclosed is a composite magnetic material for a high frequency wave, which comprises a (rareearth element)-(iron)-(nitrogen)-based magnetic material and a (rare earth element)-(iron)-(nitrogen)-based magnetic material whose surface is coated with a ferrite magnetic material.

Description

technical field [0001] The present invention relates to transformers, magnetic heads, inductors, reactors, magnetic cores (magnetic cores), magnetic yokes, antennas, and microwave components used in high-frequency or ultra-high-frequency regions mainly for power machines or information communication-related machines , magnetostrictive elements, magnetic acoustic elements, magnetic recording elements, etc., magnetic materials used in sensors that pass through magnetic fields such as Hall elements, magnetic sensors, current sensors, rotation sensors, and electronic compasses, and electromagnetic noise absorbing materials, Electromagnetic wave absorbing materials, magnetic shielding materials, and other magnetic materials that suppress malfunctions caused by unnecessary electromagnetic wave interference, materials for sensor elements such as sensors for noise reduction, materials for RFID (Radio Frequency Identification) tags, and materials for noise filters, etc. High-frequency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/26C01G49/00C04B35/58C22C38/00H01F1/00H01F1/14H01F1/33
Inventor 今冈伸嘉阿部正纪中川贵多田大
Owner TOKYO INST OF TECH
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