Unlock instant, AI-driven research and patent intelligence for your innovation.

Multilayer ceramic capacitor

A technology of ceramic capacitors and laminates, applied in the direction of laminate capacitors, capacitors, fixed capacitors, etc., can solve the problems of shortening the life time of the dielectric layer and reducing the reliability of the laminate ceramic capacitor, and achieve excellent life characteristics and bias characteristics. Effect

Active Publication Date: 2017-02-15
TAIYO YUDEN KK
View PDF9 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the dielectric layer is made thinner, the voltage applied per unit thickness increases, and the life time of the dielectric layer becomes shorter, resulting in a decrease in the reliability of the multilayer ceramic capacitor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multilayer ceramic capacitor
  • Multilayer ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In ion-exchanged water with dispersant added, BaCO 3 (specific surface area 30m 2 / g) and TiO 2 (specific surface area 50m 2 / g) was added so that the Ba / Ti molar ratio = 1 to prepare a slurry, which was mixed and dispersed using a bead mill. The above slurry was dried to remove water, and calcined at 935°C to synthesize BaTiO with an average particle diameter of 100 nm obtained from the SEM photograph. 3 .

[0059] Then, compared to BaTiO 3 100mol, as MoO 3 =0.2mol, (Ho 2 o 3 ) / 2=0.5mol, MnCO 3 =0.1mol, SiO 2 Various additives were added at a ratio of =1.0 mol (all are conversion values ​​of each compound), and a solvent was added to prepare a slurry. A PVB binder was added to this slurry, and a green sheet was coated on a PET film in a thickness of 1.0 μm.

[0060] Next, a Ni conductive paste was printed on the green sheet as an internal electrode, and a 1005-shaped multilayer ceramic capacitor with 400 layers was produced using this. After performing bind...

Embodiment 2

[0068] In addition to using MnO 3 =0.1mol (conversion value), (Ho 2 o 3 ) / 2=1.0 mol (converted value), a multilayer ceramic capacitor was produced in the same manner as in Example 1. As a result, the average valency of Mo was 4.20. The result of the high-temperature accelerated life test of the multilayer ceramic capacitor was 120 minutes, and the measurement result of the DC bias characteristic was -50%.

Embodiment 3

[0070] In addition to using (Ho 2 o 3 ) / 2=1.0 mol (converted value), a multilayer ceramic capacitor was produced in the same manner as in Example 1. As a result, the average valence number of Mo was 4.22. The result of the high-temperature accelerated life test of the multilayer ceramic capacitor was 775 minutes, and the measurement result of the DC bias characteristic was -50%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

A multilayer ceramic capacitor includes a laminate constituted by internal electrode layers of different polarities alternately stacked via dielectric layers, wherein the multilayer ceramic capacitor is such that the dielectric layers contain ceramic grains whose primary component is BaTiO3, the ceramic grains contain Mo, Mn, and rare earth R, and the average valence number of Mo in the ceramic grains is 4.18 to 4.60. The multilayer ceramic capacitor can offer excellent service life characteristics and bias characteristics even when the thickness of the dielectric layer is 0.8 [mu]m or less.

Description

technical field [0001] The present invention relates to a multilayer ceramic capacitor in which ceramic particles constituting a dielectric layer have a predetermined composition. Background technique [0002] In recent years, as the density of circuits used in digital electronic devices such as mobile phones and tablet terminals has increased, the demand for miniaturization of electronic components has increased. Large-capacity is rapidly developing. [0003] The capacitance of a multilayer ceramic capacitor is proportional to the dielectric constant of the constituent material of the dielectric layer constituting the capacitor and the number of stacked dielectric layers, and inversely proportional to the thickness of each dielectric layer. Therefore, in order to meet the demand for miniaturization, it is required to increase the dielectric constant of the material, reduce the thickness of the dielectric layer, and increase the number of stacked layers. [0004] However, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/30C04B35/468
CPCH01G4/1227H01G4/30C04B35/468C04B2235/3224C04B2235/3256C04B2235/3262
Inventor 小形曜一郎川村知荣志村哲生龙穣岩崎誉志纪
Owner TAIYO YUDEN KK