Mncozn ferrite and production method therefor

A ferrite, granulated powder technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of hindering the movement of magnetic domain walls, increasing coercivity, decreasing resistivity, etc., to suppress abnormality Effects of grain growth, low coercivity, excellent defect resistance

Active Publication Date: 2019-08-27
JFE CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Impurities, lattice defects, and other substances that greatly hinder the movement of magnetic domain walls are mixed in the abnormally grown grains, so the soft magnetic properties are lost and the coercive force is increased.
At the same time, the grain boundary formation becomes insufficient, so the resistivity decreases

Method used

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  • Mncozn ferrite and production method therefor
  • Mncozn ferrite and production method therefor
  • Mncozn ferrite and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] The contained iron, zinc, cobalt and manganese are all replaced by Fe 2 o 3 , ZnO, CoO and MnO in the form of conversion, so that Fe 2 o 3 , ZnO, CoO, and MnO were weighed so that the amounts of ZnO, CoO, and MnO became the ratios shown in Table 1, and the respective raw material powders were mixed using a ball mill for 16 hours, and then calcined in air at 925° C. for 3 hours. Next, for this calcined powder, SiO corresponding to 150 mass ppm and 700 mass ppm were weighed. 2 and CaO were added afterward, 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 a ring core and a rectangular parallelepiped. core. The particle size distribution d90 of the granulated powder used for molding was 230 μm, and its crushing strength ...

Embodiment 2

[0110] The contained iron, zinc, cobalt and manganese are all replaced by Fe 2 o 3 , ZnO, CoO and MnO calculated to form Fe 2 o 3 Weigh the raw materials so that the amount of ZnO is 49.0 mol%, the amount of ZnO is 21.0 mol%, the amount of CoO is 2.0 mol%, and the balance is MnO. After mixing with a ball mill for 16 hours, pre-calcine 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. 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.

[0111] Then, the molded body was put int...

Embodiment 3

[0120]By the method shown in Examples 1 and 2, using raw materials whose basic components and subcomponents have the same composition ratio as in Example 1-2, but which contain various amounts of impurities, the outer diameter of 25 mm and the inner diameter of A sintered annular core with a diameter of 15 mm and a height of 5 mm and five cylindrical cores with a diameter of 10 mm and a height of 10 mm were evaluated using the same method and equipment as in Example 1, and 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.

[0121]

[0122] As shown in the table, in Example 3-1 in which the contents of Cd, Pb, Sb, As, and Se were not more than the specified values, the strength indicated by the abrasion value, coercive force, resistivity, and Curie temperature were obtained. All the indicated magnetic properties are good values.

[0123] In ...

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Abstract

This invention provides an MnCoZn ferrite containing, as basic constituents, 45.0% by mole or more but less than 50.0% by mole of iron calculated as Fe2O3, 15.5 to 24.0% by mole of zinc calculated asZnO, and 0.5 to 4.0% by mole of cobalt calculated as CoO with the balance being manganese, and containing, as sub-constituents to the basic constituents, 50 to 300 ppm by mass of SiO2 and 300 to 1300ppm by mass of CaO, with the balance being unavoidable impurities, wherein the amounts of Cd, Pb, Sb, As and Se in the unavoidable impurities are suppressed to less than 20 ppm by mass each, and furthermore, the Rattler value is brought to less than 0.85%, the coercive force at 23 DEG C to 15 A/m or lower, the specific resistance to 30 ohm*m or higher, and the Curie temperature to 100 DEG C or higher. In this manner, the MnCoZn ferrite not only has excellent magnetic properties of high resistance and low coercive force, but also has excellent mechanical strength.

Description

technical field [0001] The invention relates to a MnCoZn-based ferrite with high resistivity, low coercive force and not easily damaged, and a manufacturing method thereof. [0002] In addition, in this specification, coercive force 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. Existing MnZn ferrites contain about 2% by mass or more of Fe with positive magnetic anisotropy 2+ , by combining with Fe with negative magnetic anisotropy 3+ , Mn 2+ cancel each other out, thereby achieving high initial permeability with low losses in the kHz region. [0004] Since this MnZn ferrite is cheap compared with an amorphous metal etc., it is used widely as the magnetic core of the noise filter of a switching power supply etc., a transformer, and an antenna. [0005] However, the Fe of MnZn ferrite 2+ The amount is large, therefore, it is easy to produce Fe 3+ -Fe ...

Claims

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Application Information

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