Mncozn-based ferrite and method for producing the same

A manufacturing method and ferrite technology, which are applied in the manufacture of inductors/transformers/magnets, chemical instruments and methods, iron compounds, etc., can solve the problems of reduced resistivity, increased squareness ratio, insufficient formation of grain boundaries, etc. Excellent defect resistance, the effect of suppressing abnormal grain growth

Active Publication Date: 2021-11-12
JFE CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is: Ni has a negative magnetic anisotropy energy greater than that of Mn and contains almost no Fe with positive magnetic anisotropy 2+ , so the squareness ratio increases
At the same time, the grain boundary formation becomes insufficient, so the resistivity decreases

Method used

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  • Mncozn-based ferrite and method for producing the same
  • Mncozn-based ferrite and method for producing the same
  • Mncozn-based ferrite and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] After replacing all the iron, zinc, cobalt and manganese contained with Fe 2 o 3 , ZnO, CoO, and MnO for conversion, weigh each raw material powder so that Fe 2 o 3 , ZnO, CoO, and MnO amounts to the ratios shown in Table 1, and after mixing the weighed raw material powders for 16 hours using a ball mill, calcining was performed at 925° C. for 3 hours in air. Next, for the calcined powder, SiO in amounts corresponding to 150 mass ppm and 700 mass ppm were weighed, respectively. 2 , CaO was added, and pulverized by a ball mill for 12 hours. Next, polyvinyl alcohol was added to the obtained pulverized slurry, spray-dried and granulated at an exhaust temperature of 250° C., and the coarse powder was removed through a sieve with a mesh size of 350 μm, and a pressure of 118 MPa was applied to form an annular core and cuboid core. The particle size distribution d90 of the granulated powder used for molding was 230 μm, and the crushing strength was 1.29 MPa.

[0095] The...

Embodiment 2

[0105] After replacing all the iron, zinc, cobalt and manganese contained with Fe 2 o 3 , ZnO, CoO, and MnO for conversion, weigh the raw materials to obtain Fe 2 o 3 49.0 mol % of ZnO, 21.0 mol % of ZnO, 2.0 mol % of CoO and the balance of MnO were mixed using a ball mill for 16 hours, and then calcined in air at 925° C. for 3 hours. Next, to this calcined powder, add the SiO of the amount shown in Table 2 2 , CaO, and pulverized by a ball mill for 12 hours. Next, polyvinyl alcohol was added to the obtained pulverized slurry, spray-dried and granulated at an exhaust temperature of 250° C., and the coarse powder was removed through a sieve with a mesh size of 350 μm, and a pressure of 118 MPa was applied to form an annular core and cylindrical core. The granulated powder used for molding had a particle size distribution d90 of 230 μm, a crush strength of 1.29 MPa, and the amounts of impurities P, B, S, and Cl in the ferrite were all 5 mass ppm.

[0106] Then, put the mol...

Embodiment 3

[0114] Using the method shown in Examples 1 and 2, using raw materials that make the basic components and subcomponents the same composition ratio as in Example 1-2, but the amount of impurities contained is different, the outer diameter: 25mm, inner diameter : 15mm, height: 5mm sintered annular core and 5 diameters: 10mm, height: 10mm cylindrical core, using the same method and equipment as in Example 1 to evaluate the characteristics, the results are shown in Table 3. In addition, the particle size distribution d90 of the granulated powder used for molding was 230 micrometers, and the crushing strength was 1.29 MPa.

[0115]

[0116] As shown in the table, in Example 3-1 in which the contents of P, B, S, and Cl were not more than the specified values, the strength represented by the abrasion value and the magnetic properties represented by the squareness ratio, resistivity, and Curie temperature were all obtained. good value.

[0117] In contrast, in Comparative Examples 3...

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Abstract

The invention provides a kind of MnCoZn ferrite, it contains iron: with Fe 2 o 3 45.0 mol% or more and less than 50.0 mol% in conversion, zinc: 15.5 to 24.0 mol% in conversion to ZnO, cobalt: 0.5 to 4.0 mol% in conversion to CoO, and manganese: the balance as basic components, relative to the above basic components, Contains SiO 2 : 50 to 300 mass ppm and CaO: 300 to 1300 mass ppm as subcomponents, and the balance is composed of unavoidable impurities. In this MnCoZn-based ferrite, P, B, S and Cl among the above unavoidable impurities The amount is suppressed to P: less than 50 mass ppm, B: less than 20 mass ppm, S: less than 30 mass ppm, and Cl: less than 50 mass ppm, and the wear value is less than 0.85%, and the squareness ratio at 23°C is 0.35 or less. , The resistivity is set to be 30Ω·m or more, and the Curie temperature is set to be 100°C or more, thereby not only having good magnetic properties such as high resistance and low squareness ratio, but also having excellent mechanical strength.

Description

technical field [0001] The present invention relates to an MnCoZn-based ferrite having high resistivity, a small ratio of residual magnetic flux density to saturation magnetic flux density (residual magnetic flux density / saturation magnetic flux density), that is, a squareness ratio, and is less prone to chipping, and a method for producing the same. [0002] In addition, in this specification, squareness ratio means the value at 23 degreeC. Background technique [0003] As a representative example of the soft magnetic oxide magnetic material, MnZn ferrite can be mentioned. Conventional MnZn ferrite contains about 2% by mass or more of Fe having positive magnetic anisotropy 2+ , by combining with Fe with negative magnetic anisotropy 3+ , Mn 2+ Compensating, high initial permeability and low loss are achieved in the kHz region. [0004] Since this MnZn ferrite is cheap compared with amorphous metal etc., it is used widely as the magnetic core of the noise filter of a swit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/38C01G49/00C04B35/626H01F1/34H01F41/02
CPCC01G49/00C04B35/626H01F1/34H01F41/02
Inventor 吉田裕史中村由纪子
Owner JFE CHEMICAL CORP
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