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MnCoZn ferrite and production method for same

A manufacturing method and ferrite technology, applied in chemical instruments and methods, inorganic chemistry, and magnetism of inorganic materials, can solve problems such as insufficient formation of grain boundaries, lower resistivity, etc., and achieve suppression of abnormal grain growth and good magnetic properties. Characteristics, effects of excellent damage resistance

Active Publication Date: 2019-11-05
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 ferrite and production method for same
  • MnCoZn ferrite and production method for same
  • MnCoZn ferrite and production method for same

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

Provided is a MnCoZn ferrite that not only has favorable magnetic characteristics such as high resistivity and low coercivity but also has excellent mechanical strength. A MnCoZn ferrite that comprises fundamental components, auxiliary components, and unavoidable impurities is disclosed. As the fundamental components, the MnCoZn ferrite includes at least 45.0 mol% but less than 50.0 mol% of iron in terms of Fe2O3, at least 3.0 mol% but less than 15.5 mol% of zinc in terms of ZnO, and 0.5-4.0 mol% of cobalt in terms of CoO, the remainder being manganese. As the auxiliary components, the MnCoZnferrite includes, relative to the fundamental components, 50-300 mass ppm of SiO2 and 300-1,300 mass ppm of CaO. The Cd, Pb, Sb, As, Se, Bi, and Zr of the unavoidable impurities are suppressed to lessthan 20 mass ppm each. As a result, the MnCoZn ferrite has a rattler value of less than 0.85%, a coercivity of no more than 15 A / m at 100 DEG C, a relative resistivity of at least 30 Omega m, a Curietemperature of at least 170 DEG C, an initial permeability of at least 3,000 at 100 DEG C and 1 kHz, an initial permeability of at least 2,000 at 100 DEG C and 1 MHz, and an initial permeability of at least 150 at 100 DEG C and 10 MHz.

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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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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