MULTILAYER CERAMIC CAPACITOR AND MANUFACTURING METHOD OF THE SAME

• US 20190318876A1
• Filed: 04/09/2019
• Published: 10/17/2019
• Est. Priority Date: 04/11/2018
• Status: Active Grant

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: MATSUSHITA, Yuji
• Granted Patent: US 11,056,283 B2
• Time in Patent Office: Days
• CPC Class Codes: H01G 4/012 Form of non-self-supporting electrodes
• CPC Class Codes: H01G 4/12 Ceramic dielectrics H01G4/085 takes precedence
• CPC Class Codes: H01G 4/228 Terminals
• CPC Class Codes: H01G 4/232 electrically connecting two or more layers of a stacked or rolled capacitor
• CPC Class Codes: H01G 4/2325 characterised by the material of the terminals
• CPC Class Codes: H01G 4/30 Stacked capacitors H01G4/33 takes precedence

Abstract

A multilayer ceramic capacitor includes: a ceramic main body having a structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked and are alternately exposed to two end faces of the ceramic multilayer structure, a main component of the dielectric layers being ceramic; and a pair of external electrodes that are formed from the two end faces to at least one of side faces of the ceramic main body, wherein a relationship of y≤1+1.48x is satisfied when a temperature of the multilayer ceramic capacitor is increased from 190 degrees C. to 260 degrees C., wherein “y” is a total amount of hydrogen gas, water vapor and carbonic acid gas (number of molecules/10¹⁵) released from the multilayer ceramic capacitor, wherein a volume of the multilayer ceramic capacitor is “x” (mm³).

Claims

1. A multilayer ceramic capacitor comprising:

a ceramic main body having a structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked and are alternately exposed to two end faces of the ceramic multilayer structure, a main component of the dielectric layers being ceramic; and

a pair of external electrodes that are formed from the two end faces to at least one of side faces of the ceramic main body,

wherein a relationship of y≤

1+1.48x is satisfied when a temperature of the multilayer ceramic capacitor is increased from 190 degrees C. to 260 degrees C.,

wherein “

y”

is a total amount of hydrogen gas, water vapor and carbonic acid gas (number of molecules/10¹⁵) released from the multilayer ceramic capacitor,

wherein “

x”

(mm³) is a volume of the multilayer ceramic capacitor.

2. The multilayer ceramic capacitor as claimed in claim 1, wherein the external electrodes include a plated layer.

3. The multilayer ceramic capacitor as claimed in claim 1, wherein the external electrodes include a Ni base layer and a plated layer formed on the Ni base layer.

4. The multilayer ceramic capacitor as claimed in claim 1, wherein the external electrodes include a base layer including a glass component and a plated layer formed on the base layer, a main component of the base layer being Cu.

5. The multilayer ceramic capacitor as claimed in claim 1, wherein the total amount is measured by TDS (Thermal Desorption Spectroscopy).

6. A manufacturing method of a multilayer ceramic capacitor comprising:

preparing a multilayer ceramic capacitor having a ceramic main body and a pair of external electrodes, the ceramic main body having a structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked and are alternately exposed to two end faces of the ceramic multilayer structure, a main component of the dielectric layers being ceramic, the pair of external electrodes being formed from the two end faces to at least one of side faces of the ceramic main body,

heating the multilayer ceramic capacitor in a reduced pressure atmosphere so that a relationship y≤

1+1.48x is satisfied when a temperature of the multilayer ceramic capacitor is increased from 190 degrees C. to 260 degrees C.,

wherein “

x”

(mm³) is a volume of the multilayer ceramic capacitor,

wherein “

y”

is a total amount of hydrogen gas, water vapor and carbonic acid gas (number of molecules/10¹⁵) released from the multilayer ceramic capacitor.

7. The method as claimed in claim 6, wherein

the preparing comprises:

forming a ceramic multilayer structure having a parallelepiped shape by alternately stacking ceramic dielectric green sheets and conductive paste for forming internal electrodes and alternately exposing the conductive paste to two end faces of the ceramic multilayer structure;

providing conductive paste for forming external electrodes, on the two end faces; and

firing the ceramic multilayer structure together with the conductive paste for forming external electrodes.

8. The method as claimed in claim 7, further comprising:

forming a plated layer on a base layer that is formed by the firing of the conductive paste for forming external electrodes.

9. The method as claimed in claim 6, wherein

the preparing comprises:

forming a ceramic multilayer structure having a parallelepiped shape by alternately stacking ceramic dielectric green sheets and conductive paste for forming internal electrodes and alternately exposing the conductive paste to two end faces of the ceramic multilayer structure;

forming the ceramic main body by firing the ceramic multilayer structure;

providing conductive paste for forming external electrodes on the two end faces of the ceramic main body; and

firing the conductive paste for forming external electrodes.

10. The method as claimed in claim 9, further comprising:

forming a plated layer on a base layer that is formed by the firing of the conductive paste for forming external electrodes.