Method for manufacturing ceramic electronic component, and ceramic electronic component

Patent metadata

Field	Value
Publication number	US-9328026-B2
Application number	US-201314140741-A
Country	US
Kind code	B2
Filing date	Dec 26, 2013
Priority date	Dec 28, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A raw ceramic portion is formed on each of first and second lateral surfaces of a raw ceramic body. The raw ceramic portions contain ceramic particles and more of at least one constituent selected from Ba, Mg, Mn, and a rare-earth element between the ceramic particles than the ceramic section of the raw ceramic body in terms of total amount. The raw ceramic body is fired with the raw ceramic portions thereon. In this way, a ceramic electronic component is obtained that has a main body left after the raw ceramic body is fired with the raw ceramic portions thereon.

First claim

What is claimed is:

1. A method for manufacturing a ceramic electronic component, the method comprising:
preparing a raw ceramic body including:
first and second main surfaces extending in length and width directions;
first and second lateral surfaces extending in length and thickness directions;
first and second end surfaces extending in width and thickness directions;
a first inner electrode exposed at the first end surface and the first and second lateral surfaces; and
a second inner electrode exposed at the second end surface and the first and second lateral surfaces;
the first and second inner electrodes facing each other in the thickness direction with a ceramic section located therebetween, the ceramic section containing ceramic particles and at least one constituent selected from Ba, Mn, and a rare-earth element located between the ceramic particles;

forming a raw ceramic portion on each of the first and second lateral surfaces of the raw ceramic body, the raw ceramic portions containing ceramic particles and more of the total amount content of the at least one constituent selected from Ba, Mn, and a rare-earth element located between the ceramic particles in the raw ceramic portions than that in the ceramic section; and
obtaining the ceramic electronic component including an electronic component body left after the raw ceramic body is fired with the raw ceramic portions provided thereon, by firing the raw ceramic body with the raw ceramic portions provided thereon.

2. The method for manufacturing a ceramic electronic component according to claim 1 , wherein the at least one constituent located between the ceramic particles is a rare-earth element.

3. The method for manufacturing a ceramic electronic component according to claim 1 , wherein the at least one constituent located between the ceramic particles is selected from a Ba-containing compound, a Mn-containing compound, and a compound containing a rare-earth element.

4. The method for manufacturing a ceramic electronic component according to claim 1 , wherein each of the raw ceramic portions is formed by attaching a ceramic green sheet.

5. The method for manufacturing a ceramic electronic component according to claim 1 , wherein each of the raw ceramic portions is formed by applying a ceramic paste.

6. The method for manufacturing a ceramic electronic component according to claim 1 , wherein a total amount content of the at least one constituent selected from Ba, Mn, and a rare-earth element gradually decreases from an outer side portion of the ceramic body toward an inner side portion of the ceramic body.

7. The method for manufacturing a ceramic electronic component according to claim 6 , wherein the at least one constituent between the ceramic particles is a rare-earth element.

8. The method for manufacturing a ceramic electronic component according to claim 1 , wherein end portions of the first inner electrode in the width direction are in the same or substantially the same positions in the width direction as end portions of the second inner electrode in the width direction.

9. The method for manufacturing a ceramic electronic component according to claim 1 , wherein the ceramic particles in the ceramic body are made of a perovskite compound containing Ba and Ti or a perovskite compound containing Ba, Ti, and Ca.

10. The method for manufacturing a ceramic electronic component according to claim 1 , wherein the at least one constituent between the ceramic particles is selected from a Ba-containing compound, a Mn-containing compound, and a compound containing a rare-earth element.

11. The method for manufacturing a ceramic electronic component according to claim 1 , wherein:
an end portion of a region defined by the first and second inner electrodes on a first lateral surface side in the width direction is at a distance of about 2 μm to about 30 μm from the first lateral surface; and
an end portion of the region defined by the first and second inner electrodes on a second lateral surface side in the width direction is at a distance of about 2 μm to about 30 μm from the second lateral surface.

12. The method for manufacturing a ceramic electronic component according to claim 1 , wherein the ceramic section has a thickness of about 0.4 μm to about 0.8 μm.

13. A ceramic electronic component comprising:
a ceramic body including:
first and second main surfaces extending in length and width directions;
first and second lateral surfaces extending in length and thickness directions; and
first and second end surfaces extending in width and thickness directions; and including:
ceramic particles; and
at least one constituent selected from Ba, Mn, and a rare-earth element located between the ceramic particles;

a first inner electrode extending in the ceramic body in the length and width directions and exposed at the first end surface;
a second inner electrode extending in the ceramic body in the length and width directions and exposed at the second end surface, the first and second inner electrodes facing each other in the thickness direction with a ceramic section located therebetween; wherein
end portions of the ceramic section, located between the first inner electrode and the second inner electrode, in the width direction contain more of the total amount content of the at least one constituent selected from Ba, Mn, and a rare-earth element contained in a compound present between the ceramic particles than that in a middle portion of the ceramic body in the width direction.

14. The ceramic electronic component according to claim 13 , wherein a total amount content of the at least one constituent selected from Ba, Mn, and a rare-earth element gradually decreases from an outer side portion of the ceramic body toward an inner side portion of the ceramic body.

15. The ceramic electronic component according to claim 14 , wherein the at least one constituent between the ceramic particles is a rare-earth element.

16. The ceramic electronic component according to claim 13 , wherein end portions of the first inner electrode in the width direction are in the same or substantially the same positions in the width direction as end portions of the second inner electrode in the width direction.

17. The ceramic electronic component according to claim 13 , wherein the ceramic particles in the ceramic body are made of a perovskite compound containing Ba and Ti or a perovskite compound containing Ba, Ti, and Ca.

18. The ceramic electronic component according to claim 13 , wherein the at least one constituent between the ceramic particles is selected from a Ba-containing compound, a Mn-containing compound, and a compound containing a rare-earth element.

19. The ceramic electronic component according to claim 13 , wherein:
an end portion of a region defined by the first and second inner electrodes on a first lateral surface side in the width direction is at a distance of about 2 μm to about 30 μm from the first lateral surface; and
an end portion of the region defined by the first and second inner electrodes on a second lateral surface side in the width direction is at a distance of about 2 μm to about 30 μm from the second lateral surface.

20. The ceramic electronic component according to claim 13 , wherein the ceramic section has a thickness of about 0.4 μm to about 0.8 μm.

Assignees

• Murata Manufacturing Co

Inventors

• Okajima Kenichi
• Fukunaga Daiki
• Yao Takayuki
• Nakamura Yasunari
• Shiota Akihiro

Classifications

• C04B2237/80

  Joining the largest surface of one substrate with a smaller surface of the other substrate, e.g. butt joining or forming a T-joint · CPC title

• C04B2237/346

  Titania or titanates · CPC title

• Y10T29/43

  Electric condenser making · CPC title

• B32B18/00

  Layered products essentially comprising ceramics, e.g. refractory products · CPC title

• C04B2237/704

  of one or more of the ceramic layers or articles · CPC title