Ferrite magnet with salt and manufacturing method of the same

A technology of ferrite magnets and ferrite magnets, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve problems such as deterioration of magnetic properties, inability to prevent particle growth, and increased process costs

Active Publication Date: 2014-03-26
LG ELECTRONICS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] According to the above method, small particles of less than 100nm can be produced, but bonding of particles may easily occur due to the characteristics of ferrite magnetic particles during the process of removing salts
[0011] In addition, even if fine particles are produced through the above-mentioned complicated process, the growth of particles may not be prevented during the sintering process
Problems caused by manufacturing method cause increase in process cost and deterioration of magnetic properties
[0012] Sodium chloride or potassium chloride can be added to try ferrite magnetic powder synthesis and obtain fine particles, but then molding and sintering processes are performed to remove molten salt to form a magnet, and thus there is still a problem that it is difficult to suppress ferrite magnetic particles growth, and the alignment of magnetic nanoparticles required to maximize magnetization cannot be easily achieved

Method used

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  • Ferrite magnet with salt and manufacturing method of the same
  • Ferrite magnet with salt and manufacturing method of the same
  • Ferrite magnet with salt and manufacturing method of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 O is used as a source material for barium ferrite. Mix Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 A mixture of O is used as a source material for barium ferrite. Specifically, the Ba(NO 3 ) 2 and Fe(NO 3 ) 3 9H 2 O was added to deionized water and stirred for about 1 hour to prepare Ba(NO 3 ) 2 and Fe(NO at a molar concentration of 0.6M 3 ) 3 9H 2 Source material of barium ferrite composed of O.

[0127] Sodium chloride (NaCl) was added to the source material of barium ferrite to prepare a starting material. Sodium chloride was weighed and added so that the weight ratio with respect to the ferrite magnetic powder containing salt was 19% (19 weight% with respect to 100 weight% of the ferrite magnetic powder containing salt).

[0128] The starting material is sprayed to form droplets and allowed to mix with a carrier gas (O 2 ) together through the heated reaction chamber, thereby synthesizing barium ferrite magnetic powder wit...

Embodiment 2

[0134] A starting material was prepared using a source material of barium ferrite and sodium chloride in a similar manner to Example 1, but at a weight ratio of 31% relative to ferrite magnetic powder with salt (relative to 100% by weight of Sodium chloride was weighed and added so that ferrite magnetic powder with salt was 31% by weight).

[0135] In a similar manner to Example 1, the starting material was sprayed to form droplets and allowed to mix with the carrier gas (O 2 ) together through the heated reaction chamber, thereby synthesizing barium ferrite magnetic powder with salt.

Embodiment 3

[0137] The starting material was prepared using the source material of barium ferrite and sodium chloride in a similar manner to Example 1, but at a weight ratio of 53% (relative to 100% by weight) of ferrite magnetic powder with salt. Sodium chloride was weighed and added so that ferrite magnetic powder with salt was 53% by weight).

[0138] In a similar manner to Example 1, the starting material was sprayed to form droplets and allowed to mix with the carrier gas (O 2 ) together through the heated reaction chamber, thereby synthesizing barium ferrite magnetic powder with salt.

[0139] image 3 It is a graph showing the X-ray diffraction (XRD) pattern of the barium ferrite magnetic powder with sodium chloride synthesized according to Examples 1 to 3. image 3 a shows the X-ray diffraction (XRD) pattern of the barium ferrite magnetic powder with sodium chloride synthesized according to Example 1, image 3 b shows the X-ray diffraction (XRD) pattern of the barium ferrite ma...

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Abstract

The present invention relates to a ferrite magnet with salt and a manufacturing method of the same. The ferrite magnet with salt includes 40 to 99.9 weight% of ferrite and 0.1 to 60 weight% of salt, wherein the salt has a melting point lower than a synthetic temperature of the ferrite, and the salt is melt to form a matrix between the ferrite particles. In addition, the provided manufacturing method of the ferrite magnet with salt has advantages in terms of process conditions due to fast synthesis reaction at low temperatures compared to typical magnets, easily obtaining nano-sized particles having high crystallinity, preventing cohesion between particles and particle growth by molten salt, allowing sintering at temperatures lower than typical during the molding and sintering processes for producing a ferrite magnet with salt due to synthesized ferrite magnetic powder with salt thus preventing the deterioration of magnetic characteristics due to particle growth, and allowing alignment in the direction of magnetization easy axis to obtain higher magnetic characteristics.

Description

technical field [0001] The present invention relates to ferrite magnets and methods of making the same. Background technique [0002] Soft ferrite refers to a material in which the magnetization speed is fast even under a slight magnetic field so that the magnetization of the material is suddenly saturated and the elimination or conversion of the residual magnetization can be sufficiently completed even under a weak magnetic field, and due to this characteristic, its A device primarily used to filter or amplify signals. [0003] Hard ferrite typically refers to a permanent magnet made of ferrite, which has many uses because it requires a strong magnetic field in the opposite direction without applying a voltage even when the residual magnetization is removed or converted, and is capable of generating a constant magnetic field without generating heat itself. [0004] Application of ferrite is achieved by molding and sintering, and has been used in a wide range of fields bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/36H01F41/02C04B35/26
CPCH01F1/113H01F1/37H01F41/0246H01F41/0253H01F41/0266B22F9/24C04B35/26H01F1/01
Inventor 姜喃锡金真培左容昊金钟烈安国焕曹相根
Owner LG ELECTRONICS INC
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