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

Dielectric ceramic and laminated ceramic capacitor

A technology for dielectric ceramics and capacitors, which is applied in multilayer capacitors, capacitors, fixed capacitors, etc., can solve the problems of high-temperature load life characteristics that are not clear, and the dielectric ceramic layer is not described, and achieves the effect of excellent life characteristics.

Active Publication Date: 2013-04-03
MURATA MFG CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] That is, Patent Document 1 does not describe any case where the thickness of the dielectric ceramic layer is less than 1 μm.
Therefore, it is unclear whether the dielectric ceramic described in Patent Document 1 has high reliability, good temperature characteristics, and excellent high-temperature load life characteristics as described above when the thickness of the dielectric ceramic layer is less than 1 μm.

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
  • Dielectric ceramic and laminated ceramic capacitor
  • Dielectric ceramic and laminated ceramic capacitor
  • Dielectric ceramic and laminated ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0036] (A) Production of Dielectric Ceramic Raw Materials

[0037] As a starting material, prepare BaCO as microparticles 3 , CaCO 3 and TiO 2 of each powder. Then, these powders are used to become the main component (Ba 1-x / 100 Ca x / 100 ) 1.01 TiO 3 After weighing according to the method of the composition, they were mixed using a ball mill. Here, the Ca amount x is as shown in the "Ca amount x" column of Table 1.

[0038] Next, the above-mentioned mixed powder was synthesized by calcining to obtain (Ba 1-x / 100 Ca x / 100 ) 1.01 TiO 3Main ingredient powder. The average particle diameter of the obtained main component powder was about 10 nm. In addition, when using XRD, the unreacted substances in the main component powder were below the detection level. That is, it was confirmed that the main component powder is a powder with a high degree of synthesis although it is a very small particle.

[0039] On the other hand, prepare MgO and MnCO as subcomponents 3 , SiO...

experiment example 2

[0070] In Experimental Example 2, the influence of impurities was evaluated.

[0071] In the manufacturing process of laminated ceramic capacitors such as raw material production, Sr, Zr, Hf, Zn, Na, Ag, Pd, and Ni may be mixed into dielectric ceramics as impurities, and they may exist in crystal particles and occupy In the crystal grain boundary between crystal grains. In addition, during the firing process of multilayer ceramic capacitors, etc., internal electrode components may diffuse and exist in the crystal grains in the dielectric ceramic and occupy the crystal grain boundaries between the crystal grains. In Experimental Example 2, the influence of these impurities was evaluated.

[0072] (A) Production of Dielectric Ceramic Raw Materials

[0073] In the composition formula: 100(Ba 0.95 Ca 0.05 )TiO 3 +2.0MgO+1.8SiO 2 +1.0MnO+8.0DyO 3 / 2 Except for adding the impurity components shown in Table 3 to the shown composition, a dielectric ceramic raw material was obtai...

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
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

A laminated ceramic capacitor which provides favorable life characteristics, even when a high electric field strength is applied while dielectric ceramic layers are reduced in layer thickness to less than 1 μm, contains a dielectric ceramic a compound represented by: (Ba1-x / 100Cax / 100)mTiO3 (0≰x≰20) as its main constituent, and as its accessory constituent, aMg-bSi-cMn-dR (R is at least one of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y, and a, b, c, and d (part by mol) respectively satisfy the conditions of 0.1<a≰20.0, 0.5<b≰20.0, 0.1<c≰10.0, and 1.0<d≰30.0 with respect to 100 parts by mol of the main constituent). The average grain size is 20 nm or more and less than 100 nm for crystal grains in a sintered body obtained by firing the dielectric ceramic.

Description

technical field [0001] The present invention relates to a dielectric ceramic and a laminated ceramic capacitor, in particular to a dielectric ceramic suitable for use in a thin-layer large-capacity laminated ceramic capacitor and a laminated ceramic capacitor composed of the dielectric ceramic. Background technique [0002] As one of the effective methods for meeting the demands for downsizing and increasing the capacity of multilayer ceramic capacitors, the thickness reduction of the dielectric ceramic layer included in the multilayer ceramic capacitors is aimed at. Therefore, recently, the thickness of the dielectric ceramic layer is required to be reduced to, for example, less than 1 μm. However, as the dielectric ceramic layer becomes thinner, the electric field intensity applied to each layer of the dielectric ceramic layer becomes relatively higher. Therefore, improvement in reliability at the time of voltage application is required for the dielectric ceramics to be u...

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 Patents(China)
IPC IPC(8): H01G4/12C04B35/468H01G4/30
CPCC04B2235/652C04B2235/3418C04B2235/3206C04B2235/781C04B2235/85C04B2235/3227C04B2235/6584C04B2235/3262C04B35/4682C04B2235/3229C04B2235/3224C04B2235/3225C04B2235/79C04B2235/3208B82Y30/00H01G4/30H01G4/12H01G4/1227C04B35/465
Inventor 福田惠矢尾刚之松田真神崎泰介
Owner MURATA MFG CO LTD