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Problems solved by technology
[0002] Generally speaking, if the inductance element is miniaturized, the loss tends to increase and the Q value decreases.
Method used
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Embodiment 1
[0066] First, as a raw material of the main component, Fe 2 o 3 , NiO, CuO, and then prepare ZnO in the presence of zinc oxide. Prepare SnO as a raw material for subcomponents 2 、 Bi 2 o 3 、Co 3 o 4 .
[0067] Next, the prepared raw material powders of the main component and the subcomponent were weighed so as to have the compositions described in Table 1 and Table 2 as sintered compacts, and wet-mixed with a ball mill for 16 hours to obtain a raw material mixture.
[0068] Next, after drying the obtained raw material mixture, it calcined in air at 720 degreeC for 4 hours, and turned it into the calcined powder. The calcined powder was subjected to wet pulverization for 16 hours using a ball mill made of steel to obtain a pulverized powder.
[0069] Next, after drying the pulverized powder, 10.0 wt % of a 6 wt % polyvinyl alcohol aqueous solution as a binder was added to 100 wt % of the pulverized powder and granulated to form granules. The pellets were press-molded t...
Embodiment 2
[0083] For sample No. 11 in Table 1 and sample Nos. 31, 32, and 33 in Table 2, the Q value was measured under an external magnetic field (H=20 to 400A / m) other than H=100A / m and 200A / m. The results are summarized in Figure 5 . Except for the external magnetic field, it was measured in the same manner as in Example 1. Note that sample No. 31 corresponds to a conventional non-additive material, sample No. 32 corresponds to a conventional Co-added material, and sample No. 33 corresponds to a conventional SnBi-added material. In addition, the Q value cannot be measured at H=350, 400 A / m in the conventional non-additive material and the Co-added material.
[0084] from Figure 5 It can be seen that the SnCoBi-added material according to the present invention can maintain a higher Q value under a high magnetic field of 20 to 400 A / m than conventional non-added materials, Co-added materials, and SnBi-added materials.
[0085] To sum up, it is possible to sinter the ferrite mater...
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Abstract
A ferrite composition comprises a main component and a sub component. The main component is comprised of 40.0 to 49.8 mol % iron oxide in terms of Fe2O3, 5.0 to 14.0 mol % copper oxide in terms of CuO, 0 to 32.0 mol % zinc oxide in terms of ZnO, and a remaining part of nickel oxide. The sub component includes 0.5 to 4.0 wt % tin oxide in terms of SnO2, 0.10 to 1.00 wt % bismuth oxide in terms of Bi2O3, and 0.21 to 3.00 wt % cobalt oxide in terms of Co3O4, with respect to the main component.
Description
technical field [0001] The present invention relates to a ferrite composition suitable for production of multilayer inductors and the like, and an electronic component having a ferrite sintered body composed of the composition. Background technique [0002] Generally speaking, if the inductance element is miniaturized, the loss tends to increase and the Q value decreases. Therefore, a magnetic core material capable of obtaining a high Q value and an inductance element using the magnetic core material even when miniaturized are required. [0003] In addition, in multilayer inductors, it is required that the coil conductor and the ferrite layer be fired integrally. Therefore, the ferrite composition for multilayer inductors requires a sintering temperature below the melting point of the coil conductor. [0004] Patent Document 1 discloses adding SnO to NiCuZn-based ferrite 2 , Mn 3 o 4 magnetic material. The invention described in Patent Document 1 relates to an electric...
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