Ferrite sintered body and multilayer coil component

Patent metadata

Field	Value
Publication number	US-2024212894-A1
Application number	US-202418426915-A
Country	US
Kind code	A1
Filing date	Jan 30, 2024
Priority date	Oct 7, 2021
Publication date	Jun 27, 2024
Grant date	—

Abstract

A ferrite sintered body contains a main component and a sub component. The main component contains from 4 mol % to 13 mol % of Fe in terms of Fe 2 O 3 , from 47 mol % to 58 mol % of Zn in terms of ZnO, from 1 mol % to 4 mol % of Cu in terms of CuO, from 2 mol % to 8 mol % of Ni in terms of NiO, and from 28 mol % to 36 mol % of Si in terms of SiO 2 . The sub component contains, per 100 parts by weight of the main component, from 0.8 parts by weight to 3 parts by weight of Bi in terms of Bi 2 O 3 and from 0.005 parts by weight to 0.1 parts by weight of Zr in terms of ZrO 2 .

First claim

What is claimed is:

1 . A ferrite sintered body comprising a main component and a sub component, wherein the main component includes
from 4 mol % to 13 mol % of Fe in terms of Fe 2 O 3 , from 47 mol % to 58 mol % of Zn in terms of ZnO, from 1 mol % to 4 mol % of Cu in terms of CuO, from 2 mol % to 8 mol % of Ni in terms of NiO, and from 28 mol % to 36 mol % of Si in terms of SiO 2 ,
and
the sub component includes, per 100 parts by weight of the main component,
from 0.8 parts by weight to 3 parts by weight of Bi in terms of Bi 2 O 3 and
from 0.005 parts by weight to 0.1 parts by weight of Zr in terms of ZrO 2 .

2 . The ferrite sintered body according to claim 1 , wherein
the main component includes from 4 mol % to 9 mol % of Fe in terms of Fe 2 O 3 , from 52 mol % to 58 mol % of Zn in terms of ZnO, from 1 mol % to 3 mol % of Cu in terms of CuO, from 2 mol % to 5 mol % of Ni in terms of NiO, and from 31 mol % to 36 mol % of Si in terms of SiO 2 .

3 . The ferrite sintered body according to claim 1 , wherein
the sub component further includes, per 100 parts by weight of the main component, from 0.003 parts by weight to 0.1 parts by weight of Mn in terms of Mn 2 O 3 and from 0.003 parts by weight to 0.1 parts by weight of Cr in terms of Cr 2 O 3 .

4 . The ferrite sintered body according to claim 1 , wherein
the ferrite sintered body has an average crystal grain size of from 0.2 μm to 0.8 μm.

5 . The ferrite sintered body according to claim 1 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

6 . A multilayer coil component comprising:
a multilayer body in which insulating layers comprising the ferrite sintered body according to claim 1 , and coil conductors are alternately stacked.

7 . The ferrite sintered body according to claim 2 , wherein
the sub component further includes, per 100 parts by weight of the main component, from 0.003 parts by weight to 0.1 parts by weight of Mn in terms of Mn 2 O 3 and from 0.003 parts by weight to 0.1 parts by weight of Cr in terms of Cr 2 O 3 .

8 . The ferrite sintered body according to claim 2 , wherein
the ferrite sintered body has an average crystal grain size of from 0.2 μm to 0.8 μm.

9 . The ferrite sintered body according to claim 3 , wherein
the ferrite sintered body has an average crystal grain size of from 0.2 μm to 0.8 μm.

10 . The ferrite sintered body according to claim 7 , wherein
the ferrite sintered body has an average crystal grain size of from 0.2 μm to 0.8 μm.

11 . The ferrite sintered body according to claim 2 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

12 . The ferrite sintered body according to claim 3 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

13 . The ferrite sintered body according to claim 4 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

14 . The ferrite sintered body according to claim 7 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

15 . The ferrite sintered body according to claim 8 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

16 . The ferrite sintered body according to claim 9 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

17 . The ferrite sintered body according to claim 10 , wherein
the ferrite sintered body includes a magnetic phase including at least Fe, Ni, Zn, and Cu and a non-magnetic phase containing at least Si and Zn.

18 . A multilayer coil component comprising:
a multilayer body in which insulating layers comprising the ferrite sintered body according to claim 2 , and coil conductors are alternately stacked.

19 . A multilayer coil component comprising:
a multilayer body in which insulating layers comprising the ferrite sintered body according to claim 3 , and coil conductors are alternately stacked.

20 . A multilayer coil component comprising:
a multilayer body in which insulating layers comprising the ferrite sintered body according to claim 4 , and coil conductors are alternately stacked.

Assignees

• Murata Manufacturing Co

Inventors

• Sugii Kazutoshi

Classifications

• C01P2006/42

  Magnetic properties · CPC title

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C01G49/0063

  containing zinc · CPC title