Ferrite sintered plate and ferrite sintered sheet

Patent metadata

Field	Value
Publication number	US-9824802-B2
Application number	US-201314439283-A
Country	US
Kind code	B2
Filing date	Oct 29, 2013
Priority date	Oct 31, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The present invention relates to an Ni—Zn—Cu—Co ferrite sintered plate having a composition comprising 45 to 50 mol % of Fe 2 O 3 , 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, and a ferrite sintered sheet that is provided on a surface thereof with a groove and further with an adhesive layer and/or a protective layer. The ferrite sintered sheet is capable of exhibiting an increased μ′ value of a magnetic permeability while maintaining a small μ″ value of the magnetic permeability.

First claim

The invention claimed is:

1. A ferrite sintered sheet consisting of a ferrite sintered plate, an adhesive layer formed on one surface of the ferrite sintered plate, and a protective layer formed on an opposite surface of the ferrite sintered plate, wherein the ferrite sintered plate consists of a Ni—Zn—Cu—Co ferrite having a composition comprising 45 to 50 mol % of Fe 2 O 3 , 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides.

2. The ferrite sintered sheet according to claim 1 , wherein at least one groove is formed on at least one surface of the ferrite sintered plate.

3. The ferrite sintered sheet according to claim 1 wherein the ferrite sintered plate is divided into small parts.

4. The ferrite sintered sheet according to claim 1 , wherein the ferrite sintered sheet has a μ′ of 80 to 300 and a μ″ of 0.05 to 15.

5. The ferrite sintered sheet according to claim 1 , wherein the adhesive layer is formed of a double-sided adhesive tape.

6. A ferrite sintered sheet consisting of a ferrite sintered plate, and adhesive layers respectively formed on opposite surfaces of the ferrite sintered plate, wherein the ferrite sintered plate consists of a Ni—Zn—Cu—Co ferrite having a composition comprising 45 to 50 mol % of Fe 2 O 3 , 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides.

7. The ferrite sintered sheet according to claim 6 , wherein the ferrite sintered sheet has a μ′ of 80 to 300 and a μ″ of 0.05 to 15.

8. The ferrite sintered sheet according to claim 6 , wherein the adhesive layer is formed of a double-sided adhesive tape.

9. The ferrite sintered sheet according to claim 6 , wherein at least one groove is formed on at least one surface of the ferrite sintered plate.

10. The ferrite sintered sheet according to claim 6 , wherein the ferrite sintered plate is divided into small parts.

11. A ferrite sintered sheet consisting of a ferrite sintered plate, and protective layers respectively formed on opposite surfaces of the ferrite sintered plate, wherein the ferrite sintered plate consists of a Ni—Zn—Cu—Co ferrite having a composition comprising 45 to 50 mol % of Fe 2 O 3 , 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides.

12. The ferrite sintered sheet according to claim 11 , wherein the ferrite sintered sheet has is μ′ of 80 to 300 and μ″ of 0.05 to 15.

13. The ferrite sintered sheet according to claim 11 , wherein the adhesive layer is formed of a double-sided adhesive tape.

14. The ferrite sintered sheet according to claim 11 , wherein at least one groove is formed on at least one surface of the ferrite sintered plate.

15. The ferrite sintered sheet according to claim 11 , wherein the ferrite sintered plate is divided into small parts.

Assignees

• Toda Kogyo Corp

Inventors

• Sadai Makoto
• Dote Tomohiro
• Okano Yoji

Classifications

• C04B2235/3281

  Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O · CPC title

• H01F1/344

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

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title

• C04B2235/3275

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

• C04B2235/6025

  Tape casting, e.g. with a doctor blade · CPC title