Method of manufacturing multilayer ceramic capacitor and multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-11227718-B2
Application number	US-201916287851-A
Country	US
Kind code	B2
Filing date	Feb 27, 2019
Priority date	Mar 2, 2018
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A method of manufacturing a multilayer ceramic capacitor includes: forming a multilayer body by alternately stacking a green sheet and a conductive paste for forming an internal electrode layer, the green sheet being mainly composed of a ceramic material having a perovskite structure that includes Ca and Zr and is expressed by a general expression ABO 3 and containing an alkali metal, the conductive paste being mainly composed of Cu, containing a ceramic co-material and no alkali metal; and baking the multilayer body to obtain a ceramic multilayer body.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a ceramic multilayer body including a ceramic dielectric layer and an internal electrode layer that are alternately stacked and having a substantially rectangular parallelepiped shape, the ceramic dielectric layer being mainly composed of Ca, Zr, and O and containing an alkali metal, the internal electrode layer being mainly composed of Cu and containing a co-material containing no alkali metal; and
at least two external electrodes that are coupled to a plurality of the internal electrode layers led out to an end face of the ceramic multilayer body,
wherein the co-material consists essentially of a Ca—Zr—O based material, and
wherein when a cross section parallel to a stacking direction of the multilayer ceramic capacitor is viewed at a position where the ceramic dielectric layer and the internal electrode layer are alternately stacked, a concentration of the alkali metal in a region within 1.2 μm at the ceramic dielectric layer side from a position at which the ceramic dielectric layer is in contact with the internal electrode layer is less than a concentration of the alkali metal in other regions of the ceramic dielectric layer.

2. The multilayer ceramic capacitor according to claim 1 , wherein
the alkali metal is Li.

3. The multilayer ceramic capacitor according to claim 1 , wherein
the ceramic dielectric layer contains B, Si, and Mn.

4. The multilayer ceramic capacitor according to claim 1 , wherein
a main component of the ceramic dielectric layer is CaZrO 3 .

5. The multilayer ceramic capacitor according to claim 1 , wherein
a main component of the co-material is CaZrO 3 .

6. The multilayer ceramic capacitor according to claim 1 , wherein
the co-material is composed of a compound including Ca, Zr and O.

7. The multilayer ceramic capacitor according to claim 1 , wherein
the co-material is composed of a compound composed of Ca, Zr, and O.

8. The multilayer ceramic capacitor according to claim 1 , wherein
the co-material is composed of CaZrO 3 .

9. A multilayer ceramic capacitor comprising:
a ceramic multilayer body including a ceramic dielectric layer and an internal electrode layer that are alternately stacked and having a substantially rectangular parallelepiped shape, the ceramic dielectric layer being mainly composed of Ca, Zr, and O and containing an alkali metal, the internal electrode layer being mainly composed of Cu and containing a co-material containing Ca, Zr, and O and no alkali metal; and
at least two external electrodes that are coupled to a plurality of the internal electrode layers led out to an end face of the ceramic multilayer body,
wherein when a cross section parallel to a stacking direction of the multilayer ceramic capacitor is viewed at a position where the ceramic dielectric layer and the internal electrode layer are alternately stacked, a concentration of the alkali metal in a region within 1.2 μm at the ceramic dielectric layer side from a position at which the ceramic dielectric layer is in contact with the internal electrode layer is less than a concentration of the alkali metal in other regions of the ceramic dielectric layer.

10. A multilayer ceramic capacitor comprising:
a ceramic multilayer body including a ceramic dielectric layer and an internal electrode layer that are alternately stacked and having a substantially rectangular parallelepiped shape, the ceramic dielectric layer being mainly composed of Ca, Zr, and O and containing an alkali metal, the internal electrode layer being mainly composed of Cu and containing a co-material containing Ca, Zr, and O and no alkali metal; and
at least two external electrodes that are coupled to a plurality of the internal electrode layers led out to an end face of the ceramic multilayer body,
wherein when a cross section parallel to a stacking direction of the multilayer ceramic capacitor is viewed at a position where the ceramic dielectric layer and the internal electrode layer are alternately stacked, the ceramic dielectric layer includes a section including Cu at an interface between the dielectric layer and the internal electrode layer, and includes a CaZrO 3 layer of which a concentration of an alkali metal is less than that of the section, between the section and the internal electrode layer.

11. A multilayer ceramic capacitor comprising:
a ceramic multilayer body including a ceramic dielectric layer and an internal electrode layer that are alternately stacked and having a substantially rectangular parallelepiped shape, the ceramic dielectric layer being mainly composed of Ca, Zr, and O and containing an alkali metal, the internal electrode layer being mainly composed of Cu and containing a co-material containing no alkali metal, wherein the co-material consists of CaZrO 3 ; and
at least two external electrodes that are coupled to a plurality of the internal electrode layers led out to an end face of the ceramic multilayer body.

Assignees

• Taiyo Yuden Kk

Inventors

• ARIGA Jyouji
• Nosaki Takeshi
• Ishii Masumi
• Arai Norihiro
• Moteki Hiroyuki
• Ozawa Manabu

Classifications

• H01G4/12

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

• H01G4/012

  Form of non-self-supporting electrodes · CPC title

• H01G4/30

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

• C04B2235/3203

  Lithium oxide or oxide-forming salts thereof · CPC title

• C04B2235/3262

  Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO · CPC title