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Mncozn-like ferrite and its manufacturing method

A manufacturing method and technology of ferrite, applied in chemical instruments and methods, cobalt compounds, magnetic properties of inorganic materials, etc., can solve the problems of insufficient grain boundary formation, reduced resistivity, etc., to inhibit the growth of abnormal particles and achieve good magnetic properties. Characteristics, effect of low coercivity

Active Publication Date: 2022-02-22
JFE CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the resistivity decreases due to insufficient grain boundary formation

Method used

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  • Mncozn-like ferrite and its manufacturing method
  • Mncozn-like ferrite and its manufacturing method
  • Mncozn-like ferrite and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] After converting all the iron, zinc, cobalt and manganese contained into Fe 2 o 3 , ZnO, CoO and MnO, weigh Fe according to the ratio shown in Table 1 2 o 3 , the amounts of ZnO, CoO and MnO, each raw material powder was mixed for 16 hours using a ball mill, and then calcined at 925° C. in air for 3 hours. Then, weigh 150 and 700 mass ppm equivalent SiO 2 and CaO, it was added to the calcined powder and pulverized using a ball mill for 12 hours. Next, polyvinyl alcohol was added to the obtained pulverized slurry, spray-dried and granulated at an exhaust air temperature of 250 °C, coarse powder was removed through a sieve with a mesh size of 350 μm, and then a pressure of 118 MPa was applied to form a ring core and rectangular core. In addition, due to the use of high-purity raw materials, and before use, media such as ball mills are thoroughly cleaned to reduce the mixing of components derived from other materials, so the impurities contained in the annular core an...

Embodiment 2

[0140] After converting all the iron, zinc, cobalt and manganese contained into Fe 2 o 3 , ZnO, CoO and MnO, according to Fe 2 o 3 A composition of 49.0 mol% ZnO, 10.0 mol% ZnO, 2.0 mol% CoO and the balance MnO Weigh the raw materials, mix them with a ball mill for 16 hours, and then calcinate them in air at 925°C for 3 hours. Then, the amount of SiO shown in Table 2 was added to the calcined powder 2 and CaO, and pulverized using a ball mill for 12 hours. Next, polyvinyl alcohol was added to the obtained pulverized slurry, spray-dried and granulated at an exhaust air temperature of 250 °C, coarse powder was removed through a sieve with a mesh size of 350 μm, and then a pressure of 118 MPa was applied to form a ring core and cylindrical core. The impurities Cd, Pb, Sb, As, and Se contained in the annular core and the cylindrical core were all 3 mass ppm, and Zr and Bi were 5 mass ppm. In addition, the particle size distribution d90 of the granulated powder used for moldi...

Embodiment 3

[0150] According to the method shown in Examples 1 and 2, the outer diameter is produced by using the basic ingredients and auxiliary ingredients in the same proportion as in Example 1-2, but using raw materials with different amounts of impurities, or adding ingredients intentionally: 25mm, inner diameter: 15mm, height: sintered body annular core of 5mm, and 5 diameters: 10mm, height: the cylindrical core of 10mm, use the same method and apparatus evaluation characteristic with embodiment 1, and the result that obtains is shown in Table 3. In addition, the particle size distribution d90 of the granulated powder used for molding was 230 μm, and the crushing strength was 1.29 MPa.

[0151] [table 3]

[0152]

[0153] As shown in the table, in Example 3-1 in which the contents of Cd, Pb, Sb, As, Se, Bi, and Zr were below the specified values, the strength expressed in terms of abrasion values, and the strength expressed in terms of wear at 100°C Magnetic properties indicate...

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Abstract

The present invention provides a MnCoZn ferrite, which not only has good magnetic properties of high electrical resistance and low coercive force, but also has excellent mechanical strength. A MnCoZn-like ferrite composed of basic components, auxiliary components and unavoidable impurities, wherein iron is contained as the basic component: with Fe 2 o 3 45.0 mol % or more and less than 50.0 mol %, zinc: 3.0 mol % or more and less than 15.5 mol % as ZnO, cobalt: 0.5 to 4.0 mol % as CoO, and manganese: balance; The basic ingredient contains as the auxiliary ingredient: SiO 2 : 50 to 300 mass ppm, and CaO: 300 to 1300 mass ppm; the amounts of Cd, Pb, Sb, As, Se, Bi and Zr in the unavoidable impurities are respectively controlled at less than 20 mass ppm; thus, The wear value is less than 0.85%, the coercive force at 100°C is below 15A / m, the resistivity is above 30Ω·m, the Curie temperature is above 170°C, and the initial magnetic permeability at 100°C and 1kHz is above 3000. The initial magnetic permeability at 100°C and 1 MHz is above 2000, and the initial magnetic permeability at 100°C and 10 MHz is above 150.

Description

technical field [0001] The present invention relates to a MnCoZn-like ferrite, which has a high resistivity, a small coercive force at 100°C, is hard to damage, and is suitable for use in a vehicle-mounted noise filter, etc., and a method for producing the same. the use of. Background technique [0002] A typical example of the soft magnetic oxide magnetic material is MnZn ferrite. Conventional MnZn ferrite contains about 2% by mass or more of Fe having positive magnetic anisotropy 2+ , to offset the Fe with negative magnetic anisotropy 3+ , Mn 2+ , thus achieving high initial permeability and low loss in the kHz region. [0003] Such MnZn ferrite is widely used as a noise filter of a switching power supply or the like, a transformer, or a magnetic core of an antenna because it is cheaper than an amorphous metal or the like. [0004] However, since MnZn ferrite has a large amount of Fe 2+ , so prone to Fe 3+ -Fe 2+ The electronic exchange between them, and there is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/38C01G51/00H01F1/34H01F1/36
CPCC01G51/00H01F1/34H01F1/36
Inventor 吉田裕史中村由纪子
Owner JFE CHEMICAL CORP
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