Ceramic electronic component and method of producing a ceramic electronic component

Patent metadata

Field	Value
Publication number	US-10861649-B2
Application number	US-201816032579-A
Country	US
Kind code	B2
Filing date	Jul 11, 2018
Priority date	Jul 25, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A ceramic electronic component includes: a ceramic body that includes internal electrodes; and an external electrode that includes a plurality of crystal particles containing Ba, Zn, Si, and O, the external electrode being formed on a surface of the ceramic body and connected to the internal electrodes.

First claim

The invention claimed is:

1. A ceramic electronic component, comprising:
a ceramic body that includes internal electrodes; and
an external electrode that includes a plurality of rod-like crystal particles containing Ba, Zn, Si, and O, the external electrode being formed on a surface of the ceramic body and connected to the internal electrodes,
wherein at least some of the plurality of rod-like crystal particles are deposited on the surface of the external electrode, and
wherein if the external electrode is divided into a surface region within a half depth of a thickness of the external electrode from a surface of the external electrode, and an internal region adjacent between the surface region and the ceramic body, more rod-like crystal particles of the plurality of rod-like crystal particles are present in the surface region than in the internal region.

2. The ceramic electronic component according to claim 1 , wherein
the plurality of rod-like crystal particles are formed of barium zinc silicate (BaZnSiO 4 ).

3. The ceramic electronic component according to claim 1 , wherein
each of the plurality of rod-like crystal particles has a length of 20 μm or less in a longitudinal direction.

4. The ceramic electronic component according to claim 1 , wherein
the external electrode comprises copper.

5. A method of producing a ceramic electronic component, comprising:
forming a ceramic body including internal electrodes;
applying an electrode material containing Ba, Zn, and Si and comprising flaky metal powder to a surface of the ceramic body, the flaky metal powder having a length in the longitudinal direction of 5 μm or more and a thickness of 1 μm or less; and
depositing rod-like crystal particles containing Ba, Zn, Si, and O on a surface by baking the electrode material under a humidified atmosphere, and forming an external electrode that is connected to the internal electrodes.

6. The method of producing a ceramic electronic component according to claim 5 , wherein
an aspect ratio of the length in the longitudinal direction to the thickness of the flaky metal powder is equal to or more than tenfold.

7. The method of producing a ceramic electronic component according to claim 5 , wherein
the electrode material comprises copper.

Assignees

• Taiyo Yuden Kk

Inventors

• Nakamura Tomoaki
• Tahara Mikio

Classifications

• H01G4/30

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• H01G4/2325 Primary

  characterised by the material of the terminals · CPC title

• C01B33/20 Primary

  Silicates (persilicates C01B15/14 {; containing aluminium C01B33/26}) · CPC title

• C04B2235/6588

  Water vapor containing atmospheres · CPC title

• C04B2235/3284

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