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Ferrite powder for bonded magnet, method for manufacturing same, and ferrite bonded magnet

A technology of bonded magnets and ferrites, applied in the manufacture of inductors/transformers/magnets, iron oxide/iron hydroxide, magnetic objects, etc., can solve the problem of the maximum magnetic energy product difference and achieve the effect of improving the degree of orientation

Active Publication Date: 2017-08-01
DOWA ELECTRONICS MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for bonded magnets, when compared to sintered magnets, the maximum energy product (BH max ) is poor, so in order to replace the sintered magnet with the bonded magnet, the BH of the bonded magnet is sought max The improved characteristics of

Method used

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  • Ferrite powder for bonded magnet, method for manufacturing same, and ferrite bonded magnet
  • Ferrite powder for bonded magnet, method for manufacturing same, and ferrite bonded magnet
  • Ferrite powder for bonded magnet, method for manufacturing same, and ferrite bonded magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] (Manufacture of ferrite powder (coarse powder))

[0122] A method for producing ferrite powder (coarse powder) will be described.

[0123] Iron oxide and strontium carbonate were weighed so that iron oxide:strontium carbonate=5.9:1.0 (molar ratio). After adding and mixing 0.2% by mass of boric acid and 2.3% by mass of potassium chloride to this weighed object, water was added and granulated into a spherical shape with a diameter of 3 to 10 mm to obtain a granulated product.

[0124] The obtained granulated material was put into an internal combustion type rotary furnace, and it baked at 1240 degreeC for 20 minutes, and obtained the baked material. At this time, the amount of air introduced was adjusted so that the oxygen concentration in the furnace became 3% by volume, and a baked product was obtained.

[0125] The obtained baked product was coarsely pulverized by a roller compactor to obtain ferrite powder (coarse powder). The obtained ferrite powder (coarse powder...

Embodiment 2

[0162] In the firing process of the ferrite powder (coarse powder), the ferrite powder (coarse powder) described in Example 2 was obtained in the same manner as in Example 1 except that the firing temperature was set at 1265°C. Table 1 shows the production conditions and characteristics of the ferrite powder (coarse powder) described in Example 2.

[0163] Next, using the ferrite powder (coarse powder) described in Example 2, it carried out similarly to Example 1, the ferrite powder for bonded magnets described in Example 2 was manufactured, and the bonded magnet was obtained further. Table 2 shows the properties of the ferrite powder for bonded magnets described in Example 2 and the properties of the bonded magnets.

Embodiment 3

[0165] 100 parts by weight of the obtained ferrite powder (coarse powder), 25 parts by weight of ferrite powder (fine powder), and 210 parts by weight of water were put into a wet mill, pulverized and mixed to obtain a slurry The same procedure as in Example 2 was performed except that the ferrite powder for bonded magnets described in Example 3 was obtained. Table 2 shows the production conditions and properties of the ferrite powder for bonded magnets described in Example 3.

[0166] Next, using the ferrite powder for bonded magnets described in Example 3, it carried out similarly to Example 1, and obtained the bonded magnet. Table 2 shows the properties of the bonded magnet described in Example 3.

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Abstract

Provided are a ferrite powder for a bonded magnet and a method for manufacturing the same, which enable the manufacture of a ferrite bonded magnet having a BHmax value of 2.65 MGOe or more when molded in a magnetic field, and a ferrite bonded magnet using the ferrite powder. In coarse ferrite particles having a compact density of 3.50 g / cm3 or more and a major axis length of 1.0 micrometer or more, there is provided the ferrite powder for the bonded magnet, in which the average ratio (of the major axis length / minor axis length) is 1.60 or less.

Description

technical field [0001] The present invention relates to ferrite powder for bonded magnets used in the manufacture of bonded magnets, a method for producing the same, and a ferrite-based bonded magnet using the same. Background technique [0002] For magnets requiring high magnetic force, ferrite sintered magnets are used (in the present invention, they may be described as "sintered magnets"). However, the sintered magnet has inherent problems of poor production efficiency due to cracking or need for grinding, and is difficult to process into a complex shape. Recently, there have been requests to replace the sintered magnets with ferrite bonded magnets (in the present invention, there are cases described as "bonded magnets"). However, for bonded magnets, when compared to sintered magnets, the maximum energy product (BH max ) is poor, so in order to replace sintered magnets with bonded magnets, the BH of bonded magnets is sought max properties are improved. [0003] Usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/11C01G49/00H01F1/113
CPCH01F1/11H01F1/113C01G49/06C01P2004/03C01P2004/20C01P2004/54C01P2004/61C01P2006/12C01P2006/42C01G49/0036H01F1/0315H01F41/02C01G49/00C01P2006/11H01F41/0266
Inventor 山田智也坪井禅绫部敬祐三岛泰信千田正康
Owner DOWA ELECTRONICS MATERIALS CO LTD