Ferrite ceramic composition and coil component

Patent metadata

Field	Value
Publication number	US-12534411-B2
Application number	US-202217710698-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Apr 8, 2021
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A ferrite ceramic composition includes, as main components, from 27.0 mol % to 41.0 mol % of Fe in terms of Fe 2 O 3 , from 16.0 mol % to 24.0 mol % of Ni in terms of NiO, from 23.0 mol % to 37.0 mol % of Zn in terms of ZnO, from 5.0 mol % to 9.0 mol % of Cu in terms of CuO, and from 4.0 mol % to 14.0 mol % of Si in terms of SiO 2 , and as sub-components, relative to 100 parts by mass of the main components, from 0.3 parts by mass to 1.2 parts by mass of Bi in terms of Bi 2 O 3 , from 0.3 parts by mass to 1.2 parts by mass of Co in terms of Co 3 O 4 , from 0.01 parts by mass to 0.25 parts by mass of Mn in terms of Mn 2 O 3 , and from 0.003 parts by mass to 0.030 parts by mass of Cr in terms of Cr 2 O 3 .

First claim

What is claimed is:

1 . A ferrite ceramic composition comprising:
as main components, from 27.0 mol % to 41.0 mol % of Fe in terms of Fe 2 O 3 ; from 16.0 mol % to 24.0 mol % of Ni in terms of NiO; from 23.0 mol % to 37.0 mol % of Zn in terms of ZnO; from 5.0 mol % to 9.0 mol % of Cu in terms of CuO; and from 4.0 mol % to 14.0 mol % of Si in terms of SiO 2 ; and as sub-components, relative to 100 parts by mass of the main components, from 0.3 parts by mass to 1.2 parts by mass of Bi in terms of Bi 2 O 3 ; from 0.3 parts by mass to 1.2 parts by mass of Co in terms of Co 3 O 4 ; from 0.01 parts by mass to 0.25 parts by mass of Mn in terms of Mn 2 O 3 ; and from 0.003 parts by mass to 0.030 parts by mass of Cr in terms of Cr 2 O 3 .

2 . The ferrite ceramic composition according to claim 1 , wherein an average crystal grain size of crystal grains in the ferrite ceramic composition is from 0.2 μm to 0.8 μm.

3 . The ferrite ceramic composition according to claim 1 , wherein an average crystal grain size of crystal grains in the ferrite ceramic composition is from 0.2 μm to 0.5 μm.

4 . The ferrite ceramic composition according to claim 1 , further comprising:
a magnetic phase containing at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

5 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 1 .

6 . The coil component according to claim 5 , wherein
the insulator part has a dimension of from 0.95 mm to 1.05 mm or less in a length direction and a dimension of from 0.45 mm to 0.55 mm in a width direction.

7 . The ferrite ceramic composition according to claim 2 , wherein
an average crystal grain size of crystal grains in the ferrite ceramic composition is from 0.2 μm to 0.5 μm.

8 . The ferrite ceramic composition according to claim 2 , further comprising:
a magnetic phase containing at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

9 . The ferrite ceramic composition according to claim 3 , further comprising:
a magnetic phase containing at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

10 . The ferrite ceramic composition according to claim 7 , further comprising:
a magnetic phase containing at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

11 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 2 .

12 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is configured comprised of the ferrite ceramic composition according to claim 3 .

13 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 4 .

14 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 7 .

15 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 8 .

16 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 9 .

17 . A coil component comprising:
an insulator part; a coil that is embedded in the insulator part and includes a plurality of coil conductor layers electrically connected together; and outer electrodes that are disposed on surfaces of the insulator part and are electrically connected to the coil, wherein the insulator part is comprised of the ferrite ceramic composition according to claim 10 .

18 . The coil component according to claim 11 , wherein
the insulator part has a dimension of from 0.95 mm to 1.05 mm or less in a length direction and a dimension of from 0.45 mm to 0.55 mm in a width direction.

19 . The coil component according to claim 12 , wherein
the insulator part has a dimension of from 0.95 mm to 1.05 mm or less in a length direction and a dimension of from 0.45 mm to 0.55 mm in a width direction.

20 . The coil component according to claim 13 , wherein
the insulator part has a dimension of from 0.95 mm to 1.05 mm or less in a length direction and a dimension of from 0.45 mm to 0.55 mm in a width direction.

Assignees

• Murata Manufacturing Co

Inventors

• Sugii Kazutoshi
• Sakai Takashi

Classifications

• H01F27/292

  Surface mounted devices · CPC title

• H01F1/344 Primary

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

• C04B35/265 Primary

  Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt · CPC title

• H01F17/04

  with magnetic core · CPC title

• H01F17/0013

  with stacked layers · CPC title