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Ferrite Sintered Magnet

一种烧结磁铁、铁氧体的技术，应用在永久磁铁、磁体、磁性物体等方向，能够解决不容易得到永久磁铁等问题

Active Publication Date: 2017-08-11
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, at present, if one of the magnetic properties is improved, the other magnetic property is lowered, etc., and it is never easy to obtain a permanent magnet having such three magnetic properties.

Method used

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  • Ferrite Sintered Magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159]

[0160] As the starting material, prepare CaCO 3 、La 2 o 3 , SrCO 3 , Fe 2 o 3 (Contains Al as an impurity), Co 3 o 4 , and weighed so as to obtain the composition of each sample described in Tables 1 to 4. In addition, weigh the Cr 2 o 3 The compositions of the samples described in Tables 1 to 4 were used. In addition, as the Si component, 0.33% by mass of SiO was weighed with respect to 100% by mass of the above-mentioned starting material. 2 .

[0161] In addition, in Table 1, the production changed the Cr 2 o 3 content of the sample. In Table 2, samples in which the atomic ratio (m) of Co was changed were produced. In Table 3, samples in which the atomic ratio (w) of La was changed were produced. In Table 4, samples in which the type of element A and the atomic ratio (x) of A were changed were produced.

[0162] The above initial raw materials and SiO 2 , The individual powders were mixed and pulverized using a wet mill to obtain a slurry-like ra...

Embodiment 2

[0172] In Example 2, as shown in Table 5, Sr and Ba were used as A element types, the atomic ratio of Sr was set to 0.08, the atomic ratio of Ba was set to 0.07, and the "atomic ratio x of A" was set to 0.15 ( =0.08+0.07), except that, it carried out similarly to Example 1, and obtained the ferrite sintered magnet.

Embodiment 3

[0174] In Example 3, as shown in Table 6, a ferrite sintered magnet was obtained in the same manner as in Example 1, except that samples in which the atomic ratio (z) of Fe was changed were produced.

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Abstract

A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca1-w-xLawAxFezComO19. In the formula (1), ''w'', ''x'', ''z'', and ''m'' satisfy a formula (2) of 0.30<=w<=0.50, a formula (3) of 0.08<=x<=0.20, a formula (4) of 8.55<=z<=10.00, and a formula (5) of 0.20<=m<=0.40. In the formula (1), ''A'' is at least one kind of element selected from a group consisting of Sr and Ba. Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr2O3.

Description

technical field [0001] The present invention relates to ferrite sintered magnets. Background technique [0002] Hexagonal M-type (magnetoplumbite-type) Sr ferrite and Ba ferrite are known as materials for permanent magnets made of oxides. Magnetic materials composed of these ferrites are supplied as permanent magnets in the form of ferrite sintered magnets or bonded magnets. [0003] In recent years, along with miniaturization and high performance of electronic components, permanent magnets are also required to have high magnetic properties. [0004] As indicators of the magnetic properties of a permanent magnet, remanence (Br) and coercive force (HcJ) are generally used, and the higher these indicators are, the higher the magnetic properties are evaluated. [0005] For example, Patent Document 1 discloses a ferrite magnetic material having not only high Br and HcJ but also high Hk / HcJ by containing a predetermined amount of Si component. [0006] In addition, Patent Docu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/36H01F7/02
CPCH01F1/36H01F7/0205C04B35/26C04B35/6261C04B35/62695C04B35/632C04B35/634C04B35/638C04B2235/3217C04B2235/3241C04B2235/3262C04B2235/3418C04B2235/5409C04B2235/5436C04B2235/5445C04B2235/549C04B2235/6021C04B2235/6567C04B2235/72C04B2235/726C04B2235/728C04B35/2666C04B35/2675H01F1/10C04B35/2633C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3227C04B2235/3275C04B2235/96H01F1/0315H01F7/02C04B2235/3222C04B2235/3243C04B2235/3274C04B2235/3454H01F1/0306
Inventor 森田启之
Owner TDK CORPARATION