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Magnetic metal containing resin, and coil component and electronic component, using same

A technology of magnetic metal and electronic components, applied in the direction of inorganic material magnetism, transformer/inductor magnetic core, etc., can solve the problems of high permeability barrier, low saturation magnetization of ferrite, and decrease in filling volume, etc., and achieve the suppression of magnetic metal Settlement, improvement in thermal shock resistance, and reduction in coefficient of linear expansion

Active Publication Date: 2015-01-14
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the coating material as the exterior resin described in Patent Document 1, the filling amount of NiZn ferrite powder is 4.8 g / cm in true specific gravity. 3 On the other hand, there is a problem that sufficient magnetic permeability cannot be obtained with such a resin because the filling amount of spherical filler is large.
In addition, regarding the exterior resin of Patent Document 1, there is a problem that the same spherical silica powder (2.2 g / cm 3 Around), the filling volume allowed by the soft magnetic metal powder decreases, which creates obstacles in obtaining high magnetic permeability
In addition, the ferrite (Fe-based oxide) described in Patent Document 1 has a low saturation magnetization, and there is a problem that magnetic saturation tends to occur due to the DC superposition characteristic of the inductor.

Method used

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  • Magnetic metal containing resin, and coil component and electronic component, using same
  • Magnetic metal containing resin, and coil component and electronic component, using same
  • Magnetic metal containing resin, and coil component and electronic component, using same

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0052] In Experimental Example 1, Samples 1 to 6 were produced as follows as the magnetic metal-containing resin used for the coil component. In Experimental Example 1, samples in which the average particle diameter of the spherical silica powder was varied were prepared.

[0053] First, a cresol novolak type epoxy resin was prepared as a resin commonly used in samples 1 to 6. As magnetic metal powder, prepare permalloy powder (Fe-45Ni), as oxide, prepare spherical silica powder (SiO 2 ). Table 1 shows the respective contents of spherical silica powder and permalloy powder contained in each sample prepared in Experimental Example 1, the inductance value of the coil member, and the like.

[0054]

[0055] As shown in Table 1, among the prepared permalloy powders, the permalloy powders of samples 1 to 6 had an average particle diameter D50 value of 5.2 μm and a D90 value of 14.9 μm. In addition, in samples 1 to 6, the content of the permalloy powder was 85% by mass. It sh...

experiment example 2

[0068] Regarding Experimental Example 2, the samples shown below were prepared as the magnetic metal-containing resin used for the coil component. In Experimental Example 2, samples were prepared in which the content of the permalloy powder was changed for the magnetic metal-containing resin.

[0069] First, a cresol novolak type epoxy resin was prepared as a resin commonly used in samples 7 to 12. As the magnetic metal powder, permalloy powder (Fe-45Ni) was prepared. Table 2 shows the respective contents of spherical silica powder and permalloy powder contained in each sample prepared in Experimental Example 2, the inductance value of the coil member, and the like.

[0070]

[0071] As shown in Table 2, among the prepared permalloy powders, any one of the permalloy powders of samples 7 to 12 had an average particle diameter D50 value of 5.2 μm and a D90 value of 14.9 μm. The contents of permalloy powder in sample 7, sample 8, sample 9, sample 10, sample 11 and sample 12 ...

experiment example 3

[0081] Regarding Experimental Example 3, the samples shown below were prepared as the magnetic metal-containing resin used for the coil component. In Experimental Example 3, samples obtained by varying the contents of the permalloy powder and the spherical silica powder were prepared.

[0082] First, a bisphenol A type epoxy resin was prepared as a resin commonly used in samples 13 to 18. As the magnetic metal powder, permalloy powder (Fe-45Ni) was prepared. Table 3 shows the respective contents of the spherical silica powder and the permalloy powder contained in the samples prepared in Experimental Example 3, the properties of the magnetic metal-containing resin, the inductance value of the coil member, and the like.

[0083]

[0084] As shown in Table 3, among the prepared permalloy powders, the average particle diameter D50 value of any of the permalloy powders in sample 13 to sample 18 is 5.2 μm, and the D90 value is 14.9 μm. The contents of permalloy powder in sample...

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Abstract

Provided are: a magnetic metal containing resin which can ensure less susceptibility to magnetic saturation and which has such heat shock resistance as to tolerate the heat due to the application of a DC bias or the atmospheric temperature; and a coil component and an electronic component, using the same. This magnetic metal containing resin comprises 70 to 88 mass% of a magnetic metal powder and at least 5.0 mass% of an oxide, and is characterized in that the mean particle diameter of the oxide is 2.8mum or more. It is preferable that the oxide content of the magnetic metal containing resin is 10 mass% or more. Further, it is preferable that the mean particle diameter of the oxide is in a range including 5.5mum. The magnetic metal containing resin makes it possible to produce a coil component and an electronic component which are less susceptible to magnetic saturation and which are resistant to thermal shocks.

Description

technical field [0001] The present invention relates to a magnetic metal-containing resin composed of a mixture of magnetic metal powder and resin, and a coil component and an electronic component using the resin. Background technique [0002] As a coil component used in an electronic device, a coil component including a drum core, a winding wound around the drum core, and an exterior resin layer formed between an upper flange and a lower flange of the drum core is known. For example, among the coil components described in Patent Document 1, there is disclosed a wire-wound inductor in which the ratio of the diameter of the winding core to the external dimension of the upper flange is limited. This coil component is characterized in that the ratio of the inorganic filler to the resin forming the exterior resin layer is 70 to 90% by mass. Also disclosed is a coating material for the coil component, wherein the inorganic filler is a spherical filler, and the ratio of the spher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C08K3/08C08K3/36
CPCC08L101/00C08K3/08C08K3/36C08K3/22H01F1/01H01F27/24
Inventor 丸泽博
Owner MURATA MFG CO LTD
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