MnCoZn-based ferrite

A ferrite, fe2o3 technology, applied in the direction of magnetic objects, iron compounds, cobalt compounds, etc., can solve the problems of easy damage and achieve good yield

Active Publication Date: 2022-04-01
JFE CHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that oxide magnetic materials represented by MnZn-type ferrite are ceramics, which are brittle and easily damaged. In addition, compared with conventional home appliance applications, automotive applications are subject to constant vibration and are prone to damage. Continuous use in the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Fe, Zn, Co and Mn are all contained in Fe 2 o 3 , ZnO, CoO and MnO, weigh each raw material powder to make Fe 2 o 3 , ZnO, CoO and MnO ratios are shown in Table 1. Mix with a ball mill for 16 hours, then calcined in air at 900° C. for 3 hours, and cool in air for 1.5 hours to room temperature to obtain calcined powder. Next, SiO corresponding to 150 mass ppm and 700 mass ppm were weighed, respectively. 2 and CaO were added to the above-mentioned calcined powder, and pulverized using a ball mill for 12 hours to obtain a pulverized powder. Polyvinyl alcohol was added to the pulverized powder for spray-drying and granulation, and a pressure of 118 MPa was applied to form annular magnetic cores and flat magnetic cores. After that, it was visually confirmed that there were no cracks in these molded bodies, and the molded bodies were put into a firing furnace, and fired at a maximum temperature of 1320° C. for 2 hours in an air flow of a proper mixture of nitrogen and ai...

Embodiment 2

[0108] Convert all contained Fe, Zn, Co and Mn into Fe 2 o 3 , ZnO, CoO and MnO, weigh each raw material to make Fe 2 o 3: 49.0 mol%, CoO: 2.0 mol%, ZnO: 21.0 mol%, MnO: 28.0 mol%. Mix with a ball mill for 16 hours, then calcined in air at 900° C. for 3 hours, and cool in air for 1.5 hours to room temperature to obtain calcined powder. Next, the amount of SiO shown in Table 2 2 and CaO were added to the above-mentioned calcined powder, and pulverized using a ball mill for 12 hours to obtain a pulverized powder. Polyvinyl alcohol was added to the pulverized powder for spray-drying and granulation, and a pressure of 118 MPa was applied to form annular magnetic cores and flat magnetic cores. Thereafter, these compacts were visually confirmed to be free of cracks, inserted into a firing furnace, and fired at a maximum temperature of 1320° C. for 2 hours in an air stream of a proper mixture of nitrogen and air to obtain an outer diameter of 25 mm and an inner diameter of 15 mm...

Embodiment 3

[0116] According to the method shown in Example 1, granulated powders were obtained by using raw materials having the same composition ratios of basic components and auxiliary components as in Example 1-2 but containing different amounts of P and B. A pressure of 118 MPa was applied to shape the granulated powder into ring-shaped magnetic cores and flat-shaped magnetic cores. Thereafter, these compacts were visually confirmed to be free of cracks, inserted into a firing furnace, and fired at a maximum temperature of 1320° C. for 2 hours in an air stream of a proper mixture of nitrogen and air to obtain an outer diameter of 25 mm and an inner diameter of 15 mm. , Height: 5mm sintered ring magnetic core and length: 4mm, width: 35mm, thickness: 3mm sintered flat magnetic core.

[0117] For each of the above samples, their characteristics were evaluated using the same method and equipment as in Example 1, respectively. The obtained results are shown in Table 3.

[0118] In addit...

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Abstract

The invention provides a MnCoZn-based ferrite and a manufacturing method thereof. The MnCoZn-based ferrite has excellent mechanical properties in which a flat plate-shaped magnetic core has a fracture toughness value of 1.00 MPa.m1/2 or more as measured in accordance with JIS R1607, and excellent magnetic properties in which the resistivity is 30 [Omega] .m or more, the Curie temperature is 100 DEG C or more, the coercive force of a toroidal magnetic core produced under the same conditions is 15.0 A/m or less, and the initial permeability value at 23 DEG C and 10 MHz is 150 or more. The MnCoZn ferrite is composed of a basic component, an auxiliary component and unavoidable impurities, and the contents of P, B, Na, Mg, Al and K in the unavoidable impurities are respectively controlled to be as follows: P: less than 10 ppm by mass; b: less than 10 ppm by mass; less than 200 ppm by mass of Na; mg: less than 200 mass ppm; al: less than 250 ppm by mass, and K: less than 100 ppm by mass.

Description

technical field [0001] The present invention relates to a MnCoZn-based ferrite particularly suitable for magnetic cores of automotive parts. Background technique [0002] MnZn-based ferrite is widely used as a material for noise filters such as switching power supplies, transformers, and magnetic cores for antennas. As its advantages, among soft magnetic materials, it has high magnetic permeability and low loss in the kHz region, and is cheaper than amorphous metals. [0003] On the other hand, ordinary MnZn-based ferrite has low resistivity and attenuation due to eddy current loss, so it is difficult to maintain the magnetic permeability in the 10MHz region. As a countermeasure, the following MnCoZn-like ferrite is known: Select Fe 2 o 3 The region where the amount is less than 50 mol%, and through the Co that also shows positive magnetic anisotropy 2+ Ionic substitution of Fe with positive magnetic anisotropy in usual MnZn ferrites 2+ The existence of ions, so as to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26H01F1/147
CPCC01G49/00C01G51/00C04B35/26H01F1/34
Inventor 吉田裕史中村由纪子平谷多津彦田川哲哉
Owner JFE CHEMICAL CORP
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