Ferrite composition, ferrite sintered body, electronic device, and chip coil

Patent metadata

Field	Value
Publication number	US-10894745-B2
Application number	US-201715678775-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 30, 2016
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A ferrite composition includes a main component and an accessory component. The main component includes 43.0 to 51.0 mol % of iron oxide in terms of Fe2O3, 5.0 to 15.0 mol % of copper oxide in terms of CuO, 1.0 to 24.9 mol % of zinc oxide in terms of ZnO, and a remaining part of nickel oxide. The accessory component includes 0.2 to 3.0 pts. wt. of silicon compound in terms of SiO2, 3.0 to 8.0 pts. wt. of cobalt compound in terms of Co3O4 (excluding 3.0 pts. wt.), and 0.2 to 8.0 pts. wt. of bismuth compound in terms of Bi2O3 with respect to 100 pts. wt. of the main component.

First claim

The invention claimed is:

1. A ferrite composition comprising a main component and an accessory component, wherein
the main component includes:
43.0 to 51.0 mol % of iron oxide in terms of Fe 2 O 3 ;
5.0 to 15.0 mol % of copper oxide in terms of CuO;
1.0 to 24.9 mol % of zinc oxide in terms of ZnO; and
a remaining part of nickel oxide, and
the accessory component includes:
0.2 to 3.0 pts. wt. of silicon compound in terms of SiO 2 ;
3.1 to 8.0 pts. wt. of cobalt compound in terms of Co 3 O 4 ; and
0.3 to 8.0 pts. wt. of bismuth compound in terms of Bi 2 O 3 with respect to 100 pts. wt. of the main component,
the ferrite composition has a resistivity ρ of 1.00×10 5 Ω·m or more, μ′ at 10 MHz of 4.5 or more, μ′ at 900 MHz of 5.5 or more, and an absolute value of a change rate of initial permeability μ i at 125° C. based on initial permeability μ i at 25° C. of 100% or less.

2. A ferrite sintered body composed of the ferrite composition according to claim 1 .

3. An electronic device comprising the ferrite sintered body according to claim 2 .

4. A chip coil comprising the ferrite sintered body according to claim 2 .

5. The ferrite composition according to claim 1 , wherein
the main component includes:
46.1 to 51.0 mol % of iron oxide in terms of Fe 2 O 3 ;
5.0 to 12.0 mol % of copper oxide in terms of CuO;
2.0 to 22.0 mol % of zinc oxide in terms of ZnO; and
a remaining part of nickel oxide, and
the accessory component includes:
0.2 to 2.2 pts. wt. of silicon compound in terms of SiO 2 ;
3.1 to 7.0 pts. wt. of cobalt compound in terms of Co 3 O 4 ; and
0.30 to 5.0 pts. wt. of bismuth compound in terms of Bi 2 O 3 with respect to 100 pts. wt. of the main component.

6. A ferrite sintered body composed of the ferrite composition according to claim 5 .

7. An electronic device comprising the ferrite sintered body according to claim 6 .

8. A chip coil comprising the ferrite sintered body according to claim 6 .

9. The ferrite composition according to claim 1 , wherein
the main component includes:
46.1 to 50.0 mol % of iron oxide in terms of Fe 2 O 3 ;
5.5 to 11.0 mol % of copper oxide in terms of CuO;
2.0 to 17.0 mol % of zinc oxide in terms of ZnO; and
a remaining part of nickel oxide, and
the accessory component includes:
0.2 to 2.0 pts. wt. of silicon compound in terms of SiO 2 ;
3.1 to 7.0 pts. wt. of cobalt compound in terms of Co 3 O 4 ; and
0.30 to 5.0 pts. wt. of bismuth compound in terms of Bi 2 O 3 with respect to 100 pts. wt. of the main component.

10. A ferrite sintered body composed of the ferrite composition according to claim 9 .

11. An electronic device comprising the ferrite sintered body according to claim 10 .

12. A chip coil comprising the ferrite sintered body according to claim 10 .

Assignees

• Tdk Corp

Inventors

• Kakuda Kouichi
• Wada Ryuichi
• Takahashi Yukio
• Tanoue Hiroyuki
• Suzuki Tatsuro
• Sato Takahiro
• Suzuki Takashi

Classifications

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01F17/04

  with magnetic core · CPC title

• C04B2235/3279

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

• C04B2235/3277

  Co3O4 · CPC title

• C04B2235/5445

  submicron sized, i.e. from 0,1 to 1 micron · CPC title