Ferrite and inductor including the same

Patent metadata

Field	Value
Publication number	US-10236104-B2
Application number	US-201414271968-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	Jul 19, 2013
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

An inductor is provided including a multilayer body in which a plurality of magnetic layers containing a ferrite are laminated. A coil part including a plurality of conductive patterns is disposed in the multilayer body. External electrodes are electrically connected to the coil part. The ferrite may contain iron (Fe), manganese (Mn), nickel (Ni), zinc (Zn), and vanadium (V), and the ferrite may contain 40 to 55 mol % of iron (Fe) calculated as iron oxide (Fe2O3), 5 to 20 mol % of nickel (Ni) calculated as nickel oxide (NiO), 15 to 25 mol % of zinc (Zn) calculated as zinc oxide (ZnO), 15 to 30 mol % of manganese (Mn) calculated as manganese oxide (MnO), and 1 to 4 mol % of vanadium (V) calculated as vanadium oxide (V2O5).

First claim

What is claimed is:

1. An inductor comprising:
a multilayer body in which a plurality of magnetic layers containing a ferrite are laminated;
a coil part including a plurality of conductive patterns disposed in the multilayer body, the coil part contains at least one of copper or a copper-nickel alloy; and
external electrodes electrically connected to the coil part,
wherein the ferrite contains 40 to 55 mol % of iron (Fe) calculated as Fe 2 O 3 , 5 to 20 mol % of nickel (Ni) calculated as NiO, 15 to 25 mol % of zinc (Zn) calculated as ZnO, 15 to 30 mol % of manganese (Mn) calculated as MnO, and 1 to 4 mol % of vanadium (V) calculated as V 2 O 5 .

2. The inductor of claim 1 , wherein the ferrite is sintered simultaneously with the coil part.

3. The inductor of claim 1 , wherein the ferrite is sintered under an atmosphere with a pressure lower than a Cu—Cu 2 O equilibrium oxygen partial pressure.

4. The inductor of claim 1 , wherein when a content of vanadium (V) existing in grains of the ferrite is defined as a and a content of vanadium (V) existing in grain boundaries of the ferrite is defined as b, a/b is 0.8 or less (a/b≤0.8).

5. The inductor of claim 1 , wherein the ferrite has higher insulation resistance in grain boundaries than in grains.

6. An inductor comprising:
a multilayer body in which a plurality of magnetic layers containing a ferrite are laminated;
a coil part including a plurality of conductive patterns disposed in the multilayer body, the coil part contains at least one of copper or a copper-nickel alloy; and
external electrodes electrically connected to the coil part,
wherein the ferrite contains 40 to 55 mol % of iron (Fe) calculated as Fe 2 O 3 , 5 to 20 mol % of nickel (Ni) calculated as NiO, 15 to 25 mol % of zinc (Zn) calculated as ZnO, 15 to 30 mol % of manganese (Mn) calculated as MnO, and 1 to 4 mol % of vanadium (V) calculated as V 2 O 5 , and
the ferrite contains 1.82 to 10 parts by mole of vanadium (V) calculated as vanadium oxide based on 100 parts by mole of iron (Fe) calculated as iron oxide.

7. The inductor of claim 6 , wherein when a content of vanadium (V) existing in grains of the ferrite is defined as a and a content of vanadium (V) existing in grain boundaries of the ferrite is defined as b, a/b is 0.8 or less (a/b≤0.8).

8. An inductor comprising:
a multilayer body in which a plurality of magnetic layers containing a ferrite are laminated; and
a coil part disposed in the multilayer body and containing at least one of copper (Cu) or a copper-nickel alloy;
wherein the ferrite is sintered simultaneously with the coil part under a reducing atmosphere, and
wherein the ferrite contains 40 to 55 mol % of iron (Fe) calculated as Fe 2 O 3 , 5 to 20 mol % of nickel (Ni) calculated as NiO, 15 to 25 mol % of zinc (Zn) calculated as ZnO, 15 to 30 mol % of manganese (Mn) calculated as MnO, and 1 to 4 mol % of vanadium (V) calculated as V 2 O 5 .

9. The inductor of claim 8 , wherein when a content of vanadium (V) existing in grains of the ferrite is defined as a and a content of vanadium (V) existing in grain boundaries of the ferrite is defined as b, a/b is 0.8 or less (a/b≤0.8).

10. An inductor including a ferrite comprising iron (Fe), manganese (Mn), nickel (Ni), zinc (Zn), and vanadium (V),
wherein the inductor further includes a multilayer body in which a plurality of magnetic layers containing the ferrite are laminated, and a coil part disposed in the multilayer body and containing at least one of copper (Cu) or a copper-nickel alloy,
wherein the ferrite contains 40 to 55 mol % of iron (Fe) calculated as Fe 2 O 3 , 5 to 20 mol % of nickel (Ni) calculated as NiO, 15 to 25 mol % of zinc (Zn) calculated as ZnO, 15 to 30 mol % of manganese (Mn) calculated as MnO, and 1 to 4 mol % of vanadium (V) calculated as V 2 O 5 , and
wherein when a content of vanadium (V) existing in grains of the ferrite is defined as a and a content of vanadium (V) existing in grain boundaries of the ferrite is defined as b, a/b is 0.8 or less (a/b≤0.8).

11. The ferrite of claim 10 , wherein the ferrite is sintered under an atmosphere with a pressure lower than a Cu—Cu 2 O equilibrium oxygen partial pressure.

12. An inductor comprising:
a ferrite body having first and second opposing sides;
a conductive coil disposed in the ferrite body;
a first external electrode disposed on the first side of the ferrite body electrically connected to the conductive coil; and
a second external electrode disposed on the second side of the ferrite body electrically connected to the conductive coil,
wherein the conductive coil comprises copper, copper-nickel alloy, or mixtures thereof, and
wherein the ferrite contains 40 to 55 mol % of iron (Fe) calculated as Fe 2 O 3 , 5 to 20 mol % of nickel (Ni) calculated as NiO, 15 to 25 mol % of zinc (Zn) calculated as ZnO, 15 to 30 mol % of manganese (Mn) calculated as MnO, and 1 to 4 mol % of vanadium (V) calculated as V 2 O 5 .

13. The inductor of claim 12 , wherein when a content of vanadium (V) existing in grains of the ferrite is defined as a and a content of vanadium (V) existing in grain boundaries of the ferrite is defined as b, a/b is 0.8 or less (a/b≤0.8).

14. The inductor of claim 12 , wherein the ferrite has higher insulation resistance in grain boundaries than in grains.

Assignees

• Samsung Electro Mech

Inventors

• Lee Young Il
• Moon Byeong Cheol
• Song So Yeon
• Kim Ic Seob
• Son Soo Hwan

Classifications

• H01F27/292

  Surface mounted devices · CPC title

• C04B35/26 Primary

  based on ferrites · CPC title

• C04B2235/3239

  Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate · CPC title

• C04B2235/656

  characterised by specific heating conditions during heat treatment · CPC title

• C04B2235/85

  Intergranular or grain boundary phases · CPC title