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Ferrite sintered body and ferrite core and coil parts

A technology for ferrite cores and coil components, applied in magnetic materials, electrical components, magnetic objects, etc., can solve the problems of lower Curie temperature and lower magnet properties, and achieve the effect of excellent properties and high reliability

Active Publication Date: 2016-07-06
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the magnetic permeability is to be increased, the Curie temperature tends to be lowered. The so-called lowered Curie temperature means that the magnetic properties in a high-temperature environment are significantly reduced. Therefore, ferrite with high resistivity, magnetic permeability, and Curie temperature is required. body sintered body

Method used

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  • Ferrite sintered body and ferrite core and coil parts
  • Ferrite sintered body and ferrite core and coil parts
  • Ferrite sintered body and ferrite core and coil parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]A ferrite sintered body with various changes in the main component composition and production conditions was produced, and the magnetic permeability and Curie temperature were confirmed. The preparation method of the sample is shown below. First, powders of iron oxide, zinc oxide, nickel oxide, and copper oxide having an average particle diameter of 1 μm were prepared. Then, zinc oxide, nickel oxide, and copper oxide were weighed so as to have the compositions shown in Table 1. Next, the iron oxide was weighed so that it was equivalent to the copper oxide used as the second raw material, and the balance was used as the first raw material.

[0051] Then, after crushing and mixing the iron oxide, zinc oxide and nickel oxide respectively weighed as the first raw material with a ball mill, they were calcined at 750° C. for 2 hours in a reducing atmosphere, and the obtained calcined body was crushed to obtain First raw material. In addition, iron oxide and copper oxide for...

Embodiment 2

[0063] A ferrite sintered body in which the heating rate during firing was variously changed was produced, and the magnetic permeability and mechanical properties were confirmed. In addition, the temperature rise rate at the time of baking of each sample was made into the temperature shown in Table 2, and the preparation method was the same as the sample No. 11 of Example 1 except for that. In Example 1, the rate of temperature increase during firing was 100° C., and Sample No. 30 was the same as Sample No. 11.

[0064] In addition, for the half peak width, the value of half the width between diffraction peaks at which 2θ is 1 / 2 the intensity maximum value of the X-ray diffraction peak intensity of 35° or more and 36° or less is shown in Table 2. In addition, regarding mechanical properties, three-point bending strength was measured in accordance with JISR1601-2008. In addition, the magnetic permeability and the mol% of the main component were obtained by the same method as i...

Embodiment 3

[0069] The average particle size D of the ground after making the re-calcined 50 The relationship between the magnetic permeability and the mechanical properties of the ferrite sintered body with various changes was confirmed. In addition, the average particle diameter D of the recalcination of each sample was 50 It was the size shown in Table 3, and the manufacturing method other than that was the same as that of sample No. 11 of Example 1. The average particle diameter D of the calcining again of embodiment 1 50 It is 0.80 μm, and sample No. 40 is the same as sample No. 11. In addition, the difference between sample No. 42 and sample No. 43 is only the rate of temperature rise during firing.

[0070] About the average particle size D after recalcination 50 , was measured by a laser diffraction scattering method using a MICROTRAC device (MT3300EXII manufactured by Nikkiso). In addition, for each sample, I was obtained from the diffraction pattern obtained by XRD. 3 / I ...

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Abstract

[Problem] To provide a sintered ferrite and a ferrite core which are high in resistivity, magnetic permeability, and Curie temperature and a coil component obtained by winding a metal wire on this ferrite core. [Solution] A sintered ferrite which comprises, as the main component, an oxide of Fe, Zn, Ni, and Cu, wherein if the composition of the main component is taken as 100 mol%, the Fe content is 49-50 mol% in terms of Fe2O3, the Zn content is 32-34 mol% in terms of ZnO, the Ni content is 10-12.5 mol% in terms of NiO, and the Cu content is 4-8 mol% in terms of CuO. In an examination by X-ray diffractometry, the sintered ferrite has an I2 / I1 of 0.350-0.380 where I1 is the intensity of the X-ray diffraction peak appearing at a 2theta of 35-36º and I2 is the intensity of the X-ray diffraction peak appearing at a 2theta of 29.5-30.5º.

Description

technical field [0001] The present invention relates to a ferrite sintered body, a ferrite core including the ferrite sintered body, and a coil component in which a metal wire is wound around the ferrite core. Background technique [0002] Ferrite sintered bodies have been used in magnetic cores for inductors, transformers, ballasts, electromagnets, noise filters, etc., and pulse transformers for LAN interface parts of various IT-related equipment. In addition, as a ferrite sintered body used for this magnetic core, generally, a Mn—Zn-based ferrite sintered body with high magnetic permeability is widely used. [0003] However, in the Mn-Zn-based ferrite sintered body, the metal wire cannot be directly wound on the ferrite sintered body to form a magnetic core with low resistivity (resistance), but an insulator needs to be interposed therebetween. , so the operability of winding the metal wire is poor. In addition, since an insulator must be interposed therebetween, it is d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/30H01F1/34H01F19/04
CPCC04B35/62685C04B35/26C04B35/62655C04B35/62675C04B35/6268C04B2235/3232C04B2235/3244C04B2235/3256C04B2235/3267C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/3298C04B2235/5445C04B2235/6562C04B2235/72C04B2235/96H01F1/344H01F41/0246
Inventor 古馆宪一落合仁美竹之下英博
Owner KYOCERA CORP