Ferrite composition and multilayer electronic component

Patent metadata

Field	Value
Publication number	US-10839995-B2
Application number	US-201916423760-A
Country	US
Kind code	B2
Filing date	May 28, 2019
Priority date	May 28, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A ferrite composition includes a main component that includes more than 44.0 mol % to 50.0 mol % or less of an Fe compound, 5.5 to 14.0 mol % of a Cu compound, 4.0 to 39.0 mol % of a Zn compound, and a balance of less than 40.0 mol % of a Ni compound. The ferrite composition further includes a subcomponent that includes, with respect to 100 parts by weight of the main component, more than 3.0 parts by weight to 13.0 parts by weight or less of an Si compound, more than 2.0 parts by weight to 10.0 parts by weight or less of a Co compound, and 0.25 to 5.00 parts by weight of a Bi compound. A weight ratio of the content of the Co compound to the content of the Si compound is 0.4 to 2.9.

First claim

What is claimed is:

1. A ferrite composition comprising a main component and a subcomponent, wherein
the main component comprises 44.1 mol % or more to 50.0 mol % or less of an Fe compound in terms of Fe 2 O 3 , 5.5 mol % or more to 14.0 mol % or less of a Cu compound in terms of CuO, 4.5 mol % or more to 39.0 mol % or less of a Zn compound in terms of ZnO, and a balance which is 5.4 mol % or more to 39.9 mol % or less of a Ni compound in terms of NiO,
the subcomponent, with respect to 100 parts by weight of the main component, comprises 3.1 parts by weight or more to 13.0 parts by weight or less of an Si compound in terms of SiO 2 , 2.1 parts by weight or more to 10.0 parts by weight or less of a Co compound in terms of Co 3 O 4 , and 0.25 parts by weight or more to 5.00 parts by weight or less of a Bi compound in terms of Bi 2 O 3 , and
a weight ratio of the content of the Co compound in terms of Co 3 O 4 to the content of the Si compound in terms of SiO 2 is 0.4 to 2.9.

2. The ferrite composition according to claim 1 comprising 3.0 parts by weight or more to 8.0 parts by weight or less of the Co compound in terms of Co 3 O 4 .

3. The ferrite composition according to claim 1 comprising 1.00 parts by weight or more to 4.00 parts by weight or less of the Bi compound in terms of Bi 2 O 3 .

4. The ferrite composition according to claim 2 comprising 1.00 parts by weight or more to 4.00 parts by weight or less of the Bi compound in terms of Bi 2 O 3 .

5. The ferrite composition according to claim 1 , wherein the weight ratio of the content of the Co compound in terms of Co 3 O 4 to the content of the Si compound in terms of SiO 2 is 1.0 or more to 2.5 or less.

6. The ferrite composition according to claim 2 , wherein the weight ratio of the content of the Co compound in terms of Co 3 O 4 to the content of the Si compound in terms of SiO 2 is 1.0 or more to 2.5 or less.

7. The ferrite composition according to claim 3 , wherein the weight ratio of the content of the Co compound in terms of Co 3 O 4 to the content of the Si compound in terms of SiO 2 is 1.0 or more to 2.5 or less.

8. The ferrite composition according to claim 4 , wherein the weight ratio of the content of the Co compound in terms of Co 3 O 4 to the content of the Si compound in terms of SiO 2 is 1.0 or more to 2.5 or less.

9. The ferrite composition according to claim 1 comprising
a main phase comprising a spinel ferrite,
a first subphase comprising a Zn 2 SiO 4 phase, and
a grain boundary phase comprising an SiO 2 phase.

10. The ferrite composition according to claim 9 further comprising a second subphase comprising an SiO 2 phase.

11. The ferrite composition according to claim 10 , wherein
an area of the first subphase is 1% or more and 32% or less,
an area of the second subphase is 1% or more and 16% or less,
an area of the main phase is 66% or more and 82% or less, and
an area of the grain boundary phase is 1% or more and 15% or less,
when a total area of the main phase, the first subphase, the second subphase, and the grain boundary phase is 100%.

12. A multilayer electronic component composed by laminating a coil conductor and a ceramic layer, wherein the ceramic layer comprises the ferrite composition according to claim 1 .

13. The ferrite composition according to claim 1 , which has a resistivity p of 10 6 Ω·m or more.

14. The ferrite composition according to claim 1 , which has an initial permeability μi of 3.0 or more.

15. The ferrite composition according to claim 1 , which has an Idc of 8.0 A or more.

16. The ferrite composition according to claim 1 , which has a density of 4.70 g/cm 3 or more.

17. The ferrite composition according to claim 1 , which has an alternating current resistance (Rac) of 19.9 mΩ or less.

Assignees

• Tdk Corp

Inventors

• Shibayama Takeshi
• Takahashi Yukio
• Suzuki Tatsuro
• Tanoue Hiroyuki
• Ito Yasuhiro
• Sato Takahiro
• Suzuki Takashi

Classifications

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title

• H01F1/344 Primary

  Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4 · CPC title

• C04B35/26

  based on ferrites · CPC title

• C04B2235/3279

  Nickel oxides, nickalates, or oxide-forming salts thereof · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title