NiZn-based ferrite, magnetic core using the same, and noise filter

Abstract

This invention provides a NiZn-based ferrite that offers excellent productivity and can suppress the increase in the rate of change of complex relative permeability with respect to temperature, as well as a noise filter using the same. [Solution] A NiZn-based ferrite containing Fe in the form of "48.06 mol% or more and 48.43 mol% or less" in Fe2O3 equivalent, Zn in the form of "29.47 mol% or more and 29.96 mol% or less" in ZnO equivalent, Cu in the form of "5.70 mol% or more and 6.30 mol% or less" in CuO equivalent, and Ni in the form of "15.70 mol% or more and 16.34 mol% or less" in NiO equivalent, wherein when the total amount of Fe2O3, ZnO, NiO and CuO is taken as 100 mol%, the total amount of Fe2O3 and ZnO is "77.51 mol% or more and 78.39 mol% or less".

Claims

1. Fe ２ O ３ In terms of conversion, Fe is "48.04 mol% or more and 48.43 mol% or less", Zn with a concentration of "29.47 mol% or more and 29.96 mol% or less" in terms of ZnO, Cu with a concentration of "5.70 mol% or more and 6.30 mol% or less" in CuO equivalent, Ni with a concentration of "15.70 mol% or more and 16.34 mol% or less" in NiO equivalent. It contains, and, Fe ２ O ３ When the total amount of ZnO, NiO, and CuO is set to 100 mol%, The Fe ２ O ３ And the total amount of ZnO is "77.51 mol% or more and 78.39 mol% or less". NiZn-based ferrite.

2. NiZn-based ferrite according to claim 1, The aforementioned Cu is "6.00 mol% or more and 6.07 mol% or less" in terms of CuO equivalent. NiZn-based ferrite.

3. NiZn-based ferrite according to claim 1, The Fe ２ O ３ And the total amount of ZnO is "77.59 mol% or more and 78.26 mol% or less". NiZn-based ferrite.

4. NiZn-based ferrite according to claim 1, The Curie temperature Tc is 160°C or higher. Complex relative permeability μ ２５ is the complex relative permeability μ under the conditions of "frequency 100 kHz, temperature 25°C", and is 800 or more and 1200 or less. NiZn-based ferrite.

5. NiZn-based ferrite according to claim 4, The complex relative permeability μ is the temperature Tμ at which it is maximum between 50°C and 130°C. ｍａｘ There is, NiZn-based ferrite.

6. NiZn-based ferrite according to claim 5, Complex relative permeability μ ｍａｘ This is the highest complex relative permeability μ among the complex relative permeability μs under the conditions of "frequency 100 kHz, -40°C to 150°C". The complex relative permeability μ ２５ The complex relative permeability μ for the above ｍａｘ Rate of change Δμ ｍａｘ It is less than 40%, and "Δμ ｍａｘ = (μ ｍａｘ -μ ２５ ) / μ ２５ It is "x 100 (%)" NiZn-based ferrite.

7. NiZn-based ferrite according to any one of claims 1 to 6, The total amount of Fe, Zn, Ni, and Cu is each Fe ２ O ３ When calculated as 100 parts by mass in terms of ZnO, NiO, and CuO, Mn ３ O ４ In terms of conversion, Mn is "0.500 parts by mass or less", Ca in terms of CaO equivalent of "0.025 parts by mass or less", SiO ２ In terms of conversion, Si is "0.250 parts by mass or less", It contains, NiZn-based ferrite.

8. A magnetic core using NiZn-based ferrite according to any one of claims 1 to 6.

9. A noise filter using a magnetic core as described in claim 8.

10. A noise filter according to claim 9, The aforementioned magnetic core comprises a columnar shaft portion and a first magnetic core having flange portions at both ends of the shaft portion, The device comprises a plate-shaped second magnetic core that spans between the flanges of the first magnetic core, A noise filter comprising a first conductor and a second conductor wound around the shaft of the first magnetic core.

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