Ferrite ceramic composition, ceramic electronic component, and method for manufacturing ceramic electronic component

Patent metadata

Field	Value
Publication number	US-9296659-B2
Application number	US-201414192659-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Sep 2, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A ceramic electronic component includes a magnetic section composed of a ferrite material and a coil conductor containing Cu as its main constituent. The magnetic section is formed from Ni—Cu—Zn ferrite which falls within the range specified by (x, y)=A (25, 1), B (47, 1), C (47, 7.5), D (46, 7.5), E (46, 10), F (30, 10), G (30, 7.5), and H (25, 7.5) when the molar content x of Fe 2 O 3 and the molar content y of Mn 2 O 3 are represented by (x, y). A CuO molar content of 0.5 to 10.0 mol %, a ZnO content of 1.0 to 35.0 mol %, a MgO content of 5.0 to 35.0 mol %, and NiO as the balance is present. Even when co-firing with a conductive material containing Cu as its main constituent, insulation properties are ensured, favorable electrical properties are achieved, and a ceramic electronic component is achieved.

First claim

The invention claimed is:

1. A ceramic electronic component comprising:
a magnetic section including a ferrite material; and
a conductive section containing Cu as a main constituent,
the magnetic section being formed from a ferrite ceramic composition containing at least Fe, Mn, Cu, Zn, Mg, and Ni,
wherein when a molar content x mol % of Fe in terms of Fe 2 O 3 and a molar content y mol % of Mn in terms of Mn 2 O 3 are represented by (x, y), the (x, y) falls within a region surrounded by A (25, 1), B (47, 1), C (47, 7.5), D (46, 7.5), E (46, 10), F (30, 10), G (30, 7.5), and H (25, 7.5), a molar content of Cu is 0.5 to 10.0 mol % in terms of CuO, a molar content of Zn is 1.0 to 35.0 mol % in terms of ZnO, and a molar content of Mg is 5.0 to 35.0 mol % in terms of MgO.

2. The ceramic electronic component according to claim 1 , wherein the ceramic electronic component is obtained by firing in an atmosphere at lower than or equal to an equilibrium oxygen partial pressure of Cu—Cu 2 O.

3. The ceramic electronic component according to claim 1 , wherein the magnetic section and the conductive section are obtained by co-firing.

4. The ceramic electronic component according to claim 1 , wherein the magnetic section and the conductive section are alternately stacked more than once.

5. The ceramic electronic component according to claim 1 , wherein the ceramic electronic component is a laminated coil component.

6. A method for manufacturing a ceramic electronic component, the method comprising the steps of:
weighing a Fe compound, a Mn compound, a Cu compound, a Zn compound, a Mg compound, and a Ni compound so that when a molar content x mol % of Fe in terms of Fe 2 O 3 and a molar content y mol % of Mn in terms of Mn 2 O 3 are represented by (x, y), the (x, y) includes a region surrounded by A (25, 1), B (47, 1), C (47, 7.5), D (46, 7.5), E (46, 10), F (30, 10), G (30, 7.5), and H (25, 7.5), and a molar content of Cu is 0.5 to 10.0 mol % in terms of CuO, a molar content of Zn is 1.0 to 35.0 mol % in terms of ZnO, and a molar content of Mg is 5.0 to 35.0 mol % in terms of MgO;
mixing and then calcining the weighed compounds to prepare a calcined powder;
preparing a ceramic thin-layer body from the calcined powder;
forming, on the ceramic thin-layer body, a conductive film containing Cu as a main constituent in a predetermined pattern;
forming a laminated body by stacking the ceramic thin-layer body with the conductive film formed in a predetermined order; and
firing the laminated body in a firing atmosphere at lower than or equal to an equilibrium oxygen partial pressure of Cu—Cu 2 O to co-fire the ceramic thin-layer body and the conductive film.

Assignees

• Murata Manufacturing Co

Inventors

• Nakamura Akihiro
• Yamamoto Atsushi

Classifications

• H01F41/0246

  Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36) · CPC title

• H01F17/0013

  with stacked layers · CPC title

• C04B2235/3279

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

• C01P2002/32

  spinel-type (AB2O4) · CPC title

• C01G53/40

  Complex oxides containing nickel and at least one other metal element · CPC title