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Laminated ceramic capacitor and manufacturing method thereof

A technology of ceramic capacitors and ceramic dielectrics, applied in capacitor manufacturing, multilayer capacitors, capacitors, etc., can solve the problems of reducing electrostatic capacitance and reducing the area of ​​internal electrodes, and achieve the effect of low cost

Active Publication Date: 2009-01-28
TAIYO YUDEN KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, further shrinkage is caused, and the internal electrodes of the completed laminated ceramic capacitor are in a grid-like or island-like interrupted state
This reduces the area of ​​the internal electrodes and reduces the capacitance

Method used

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  • Laminated ceramic capacitor and manufacturing method thereof
  • Laminated ceramic capacitor and manufacturing method thereof
  • Laminated ceramic capacitor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Prepare barium titanate-based dielectric ceramic powder as a capacitor material that exhibits X7R characteristics (the change rate of electrostatic capacitance within the temperature range of -55°C to +125°C at 25°C is within ±15%), and mixes it with poly Vinyl butyral, dioctyl phthalate, ethanol, etc. were mixed, and mixed with a disperser mill for 15 hours to obtain a ceramic slurry. The obtained ceramic slurry was coated on a strip-shaped PET film by a doctor blade method to form a ceramic green sheet with a thickness of 1.4 μm.

[0044] Ni powder in which CoO was coated on Ni particles with an arithmetic average particle diameter of 0.2 μm by spray pyrolysis was mixed with ethyl cellulose, terpineol, etc., to prepare a conductive paste for internal electrodes. Apply this conductive paste on the ceramic green sheet by screen printing method, within the range of 15cm x 15cm, in a roughly rectangular shape of 3.75mm x 0.75mm, a plurality of paste films with a thickness...

Embodiment 2

[0058]A laminated ceramic capacitor was formed in the same manner as in Example 1, except that Ni particles having an arithmetic average particle diameter of 0.2 μm were coated with a base metal by the method of adsorbing an acetylacetonate metal complex. The types of base metals to be coated are shown in Table 3.

[0059] 【table 3】

[0060]

[0061] For the obtained multilayer ceramic capacitor, the capacitance, the thickness of the internal electrode layer, the continuity of the internal electrode layer, and the average particle diameter of the metal particles constituting the internal electrode were measured in the same manner as in Example 1, as shown in Table 4.

[0062] 【Table 4】

[0063]

[0064] From the results in Table 4, it can be seen that the same effect can be obtained even if Mn, Fe, Cu, Nb, Ba, Ca, Sr, Ti, Zn, V, and rare earth metals other than Co are used as the base metal to coat Ni. .

[0065] From the above results, it can be seen that the multila...

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Abstract

The purpose of the invention is to obtain a laminated ceramic capacitor of the internal electrode with great continuity with a low cost. The internal electrode layer (4) of the laminated ceramic capacitor (1) is composed of the metal particles (40); the metal particles (40) processes the solution for the thickness (T) of the average granule diameter less than the inner electrode layer (4) in the direction of the particle diameter (R) parallel to the direction of the internal electrode layer (4); the internal electrode layer can be formed by the conductive paste with the conductive powder, which is obtained by the heat process in the reductive atmosphere in the 10-14-10-18 atm partial pressure of oxygen. The conductive powder is covered with the base metal particles selected from the Mn, Co, Fe, Cu, Nb, Ba, Ca, Sr, Ti, Zn and tombar thite or the oxidant particles on the Ni metal particles.

Description

technical field [0001] The present invention relates to a laminated ceramic capacitor and its manufacturing method, characterized by Ni internal electrodes. Background technique [0002] A laminated ceramic capacitor can be produced by coating a conductive paste containing Ni metal particles by screen printing on a ceramic green sheet to form an internal electrode pattern, and forming the ceramic green sheet forming the internal electrode pattern in multiple layers. A laminated body is obtained by combining, and the laminated body is fired, thereby being produced. [0003] The Ni conductive paste is fired simultaneously with the ceramic green sheet. The sintering start temperature of the Ni metal particles contained in the conductive paste is lower than the sintering start temperature of the ceramic layer formed from the ceramic green sheet, and therefore, the sintering of the Ni metal particles starts first, and then shrinkage starts. Then the sintering of the ceramic die...

Claims

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Application Information

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IPC IPC(8): H01G4/30H01G4/005H01G4/008H01G4/12H01G4/232
CPCH01G4/1227Y10T29/435H01G4/005H01G4/30H01G4/12H01G13/00
Inventor 粕谷雄一水野洋一
Owner TAIYO YUDEN KK
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