Multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-10312020-B2
Application number	US-201715600609-A
Country	US
Kind code	B2
Filing date	May 19, 2017
Priority date	May 24, 2016
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

In an embodiment, a multilayer ceramic capacitor 10 has a first external electrode 12 and a second external electrode 13 that each contain metal grains MP and dielectric grains DP, where an oxide of the same metal element constituting the metal grain MP, or MO, is present at the interface between the metal grain MP and the dielectric grain DP. The multilayer ceramic capacitor can prevent the hardness of its external electrodes from dropping, even when the external electrodes contain metal grains and dielectric grains.

First claim

We claim:

1. A multilayer ceramic capacitor using external electrodes that contain metal grains and dielectric grains, wherein a metal oxide of a same metal element constituting the metal grain is present at an interface between the metal grain and the dielectric grain of the external electrodes, wherein the dielectric grains contain barium titanate.

2. A multilayer ceramic capacitor according to claim 1 , wherein the metal oxide is present intermittently at the interface between the metal grain and the dielectric grain.

3. A multilayer ceramic capacitor according to claim 1 , wherein a metal element constituting the metal grain is a base metal element.

4. A multilayer ceramic capacitor according to claim 2 , wherein a metal element constituting the metal grain is a base metal element.

5. A multilayer ceramic capacitor according to claim 1 , wherein a metal element constituting the metal grain is nickel.

6. A multilayer ceramic capacitor according to claim 2 , wherein a metal element constituting the metal grain is nickel.

7. A multilayer ceramic capacitor according to claim 1 , wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

8. A multilayer ceramic capacitor according to claim 2 , wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

9. A multilayer ceramic capacitor according to claim 3 , wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

10. A multilayer ceramic capacitor according to claim 4 , wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

11. A multilayer ceramic capacitor according to claim 5 , wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

12. A multilayer ceramic capacitor according to claim 6 , wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

13. A multilayer ceramic capacitor according to claim 1 , wherein the external electrodes are formed, opposing each other, on two end faces of a capacitor body, wherein the capacitor body is constituted by a capacitive part including internal electrode layers, and dielectric cover parts formed on upper and lower faces of the capacitive part, respectively, wherein a primary component of the capacitor body, except for the internal electrode layers, is barium titanate which is the same component contained in the dielectric grains of the external electrodes.

Assignees

• Taiyo Yuden Kk

Inventors

• Ryu Minoru
• Tahara Mikio
• Orimo Hirokazu

Classifications

• H01G4/2325 Primary

  characterised by the material of the terminals · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G4/1209 Primary

  characterised by the ceramic dielectric material (H01G4/1272, H01G4/1281 take precedence) · CPC title

• H01G4/10

  Metal-oxide dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G4/005

  Electrodes · CPC title