Ceramic electronic component and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-9840787-B2
Application number	US-201514963298-A
Country	US
Kind code	B2
Filing date	Dec 9, 2015
Priority date	Jun 13, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A ceramic electronic component includes a ceramic body, baked external electrodes, and plated external electrodes, and glass layers derived from a glass material included in a conductive paste of the baked external electrodes, are provided at interfaces between the baked external electrodes and the ceramic body, such that the glass layers extend from the interfaces between the ceramic body and the baked external electrodes to a surface of the ceramic body that does not contain the baked external electrodes.

First claim

What is claimed is:

1. A ceramic electronic component comprising:
a ceramic body;
a baked external electrode including a baked conductive paste including a conductive material and a glass material on the ceramic body; and
a plated external electrode plated on a surface of the baked external electrode; wherein
a glass layer derived from the glass material included in the conductive paste is provided at an interface between the baked external electrode and the ceramic body;
the ceramic body has a first basicity;
the glass material included in the conductive paste has a second basicity;
a difference between the first basicity and the second basicity has an absolute value of about 0.21 or less; and
the glass layer extends from the interface between the ceramic body and the baked external electrode to a surface of the ceramic body that does not contain the baked external electrode.

2. The ceramic electronic component according to claim 1 , wherein the glass layer extending on the surface of the ceramic body extends about 10 μm or more from an outer edge of the baked external electrode, and the outer edge of the baked external electrode does not contact with the surface of the ceramic body over an entire periphery.

3. The ceramic electronic component according to claim 1 , wherein the conductive material comprises at least one of Cu, an alloy containing Cu, Ag, an alloy containing Ag, Pd, and an alloy containing Pd.

4. The ceramic electronic component according to claim 1 , wherein the ceramic electronic component is one of an NTC thermistor and a PTC thermistor.

5. The ceramic electronic component according to claim 1 , wherein the plated external electrode includes two plated layers.

6. The ceramic electronic component according to claim 1 , wherein the plated external electrode includes a Ni plated external electrode plated on the baked external electrode.

7. The ceramic electronic component according to claim 6 , further comprising an Sn plated external electrode plated on the Ni plated external electrode.

8. The ceramic electronic component according to claim 1 , wherein the ceramic body includes internal electrodes connected to the plated external electrode.

9. A method for manufacturing a ceramic electronic component, the method comprising the steps of:
firing a ceramic body;
applying a conductive paste including a conductive material and a glass material to the ceramic body;
baking the applied conductive paste to form a baked external electrode on the ceramic body, and forming a glass layer derived from the glass material included in the conductive paste, to extend between an interface between the baked external electrode and the ceramic body, and from the interface to a surface of the ceramic body that does not contain the baked external electrode; and
forming a plated external electrode on a surface of the baked external electrode;

wherein
the ceramic body has a first basicity;
the glass material included in the conductive paste has a second basicity; and
a difference between the first basicity and the second basicity has an absolute value of about 0.21 or less.

10. The method for manufacturing a ceramic electronic component according to claim 9 , wherein the glass layer extending on the surface of the ceramic body extends about 10 μm or more from an outer edge of the baked external electrode, and the outer edge of the baked external electrode is not brought into contact with the surface of the ceramic body over an entire periphery.

11. The method for manufacturing a ceramic electronic component according to claim 9 , wherein a temperature of baking the conductive paste is about 30° C. or more higher than a softening point of the glass material included in the conductive paste.

12. The method for manufacturing a ceramic electronic component according to claim 9 , wherein the glass layer has a solubility in plating solution of about 3.3% or less after immersion for about 5 hours in a plating solution for use in the step of forming the plated external electrode.

13. The method for manufacturing a ceramic electronic component according to claim 9 , wherein the ceramic electronic component is one of an NTC thermistor and a PTC thermistor.

14. The method for manufacturing a ceramic electronic component according to claim 9 , wherein the plated external electrode includes two plated layers.

15. The method for manufacturing a ceramic electronic component according to claim 9 , wherein the plated external electrode includes a Ni plated external electrode plated on the baked external electrode.

16. The method for manufacturing a ceramic electronic component according to claim 15 , further comprising an Sn plated external electrode plated on the Ni plated external electrode.

17. The method for manufacturing a ceramic electronic component according to claim 9 , wherein the ceramic body includes internal electrodes connected to the plated external electrode.

Assignees

• Murata Manufacturing Co

Inventors

• Kitada Eriko
• Ito Hiromasa
• Sasaki Tsutomu

Classifications

• H01C1/14

  Terminals or tapping points specially adapted for resistors; Arrangements of terminals or tapping points on resistors · CPC title

• H01C7/008

  Thermistors (H01C7/02 - H01C7/06 take precedence) · CPC title

• H01C7/041

  formed with two or more layers · CPC title

• H01C1/1413

  Terminals or electrodes formed on resistive elements having negative temperature coefficient · CPC title

• H01C7/042

  mainly consisting of inorganic non-metallic substances (H01C7/041 takes precedence) · CPC title