Process for producing dielectric ceramic composition

A technology for dielectric ceramics and compositions is applied in the field of preparation of dielectric ceramic compositions, which can solve the problems of easy evaporation and difficult calcination.

Inactive Publication Date: 2002-02-27
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, when alkaline earth metals are increased accordingly, then a problem that is brought about is that it is difficult to calcine
Therefore, the problem with Zn is that it is easy to evaporate

Method used

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  • Process for producing dielectric ceramic composition
  • Process for producing dielectric ceramic composition
  • Process for producing dielectric ceramic composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] Multilayer ceramic capacitor samples were produced in the following manner.

[0215] First, the following slurries were prepared.

[0216] Dielectric layer slurry

[0217] Various components of major and minor components having a particle size in the range of 0.1-1 micron are first prepared. Carbonates are used as components of MgO and MnO, and oxides are used as other components. Will (Ba 0.6 Ca 0.4 ) SiO 3 Ingredient used as the second minor component. Note (Ba 0.6 Ca 0.4 ) SiO 3 Wet mixed BaCO by ball mill 3 , CaCO 3 and SiO 2 After 16 hours, the mixture was dried, then fired in the air at 1150°C and further pulverized with a ball mill for 100 hours.

[0218] First, the BaTiO 3 Main components and MgCO 3 The first subcomponents are mixed and the mixture is dried to produce a pre-calcined powder. As shown in Table 1, relative to 100 moles of Ba m TiO 2＋m , the pre-calcined powder contains 0.9 moles of MgCO 3 , In addition, when detecting the molar ra...

Embodiment 2

[0270] BaTiO 3 Main component, MgCO 3 The first subcomponent and Y 2 o 3 The fifth subcomponent is mixed and the mixture is dried to prepare a pre-calcined powder. As shown in Table 1, relative to 100 moles of Ba m TiO 2＋m , the pre-calcined powder contains 0.9 moles of MgCO 3 and 0.5 mol Y 2 o 3 . When detecting the molar ratio of the specific components (Ba+Mg+Ca+Sr) / (Ti+Yb+Y) in the pre-calcined powder, as shown in Table 1, it is 0.999. The molar ratio of (Ba+Yb+Y) / (Ti+Mg+Ca+Sr) was found to be 1.001, as shown in Table 1.

[0271] Next, the calcined powder was calcined in the same manner as in Example 1 to prepare cylindrical samples and capacitor samples, except that as shown in Table 2, 3.0 moles (Ba 0.6 Ca 0.4 ) SiO 3 , 0.374 mol MnCO 3 , 0.1 mole V 2 o 5 , 2.1 mol Yb 2 o 3 and 1.5 moles of Y 2 o 3 , and carry out the same test as in Example 1. The results are shown in Table 3 and Figure 4 middle.

Embodiment 3

[0273] BaTiO 3 Main component, MgCO 3 The first minor component and Yb 2 o 3 The fourth subcomponent is mixed and the mixture is dried to prepare a pre-calcined powder. As shown in Table 1, relative to 100 moles of Ba m TiO 2＋m , the pre-calcined powder contains 0.9 moles of MgCO 3 and 0.5 mol Yb 2 o 3 . When detecting the molar ratio of the specific components (Ba+Mg+Ca+Sr) / (Ti+Yb+Y) in the pre-calcined powder, as shown in Table 1, it is 0.999. The molar ratio of (Ba+Yb+Y) / (Ti+Mg+Ca+Sr) was found to be 1.001, as shown in Table 1.

[0274] Next, the calcined powder was calcined in the same manner as in Example 1 to prepare cylindrical samples and capacitor samples, except that as shown in Table 2, 3.0 moles of (Ba 0.6 Ca 0.4 ) SiO 3 , 0.374 mol MnCO 3 , 0.1 mole V 2 o 5 , 1.6 mol Yb 2 o 3 and 2.0 moles Y 2 o 3 , and carry out the same test as in Example 1. The results are shown in Table 3 and Figure 4 middle.

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Abstract

A method of manufacturing a dielectric ceramic composition comprising at least BaTiO3 as a main component, a second subcomponent having SiO2 as a main component and at least one type selected from MO (note that M is at least one type of element selected from Ba, Ca, Sr and Mg), Li2O and B2O3 and other subcomponents, comprising the steps of mixing in the main component at least part of other subcomponents except for the second subcomponent to prepare a pre-calcination powder, calcining said pre-calcination powder to prepare a calcined powder, and mixing at least said second subcomponent in said calcined powder to obtain a dielectric ceramic composition having ratios of the subcomponents to BaTiO3 as the main component of predetermined molar ratios.

Description

field of invention [0001] The invention relates to a preparation method of a dielectric ceramic composition, the composition has reduction resistance, a specific permittivity of 1000 or more than 1000, and satisfies the X8R characteristic in the EIA standard (within -55-150°C, Δ=±15% ) Capacitance-temperature characteristics, small dielectric loss, high permittivity, high insulation resistance and extremely high temperature accelerated life characteristics. Background technique [0002] Multilayer ceramic capacitors are widely used as small, high-capacitance, high-reliability electronic devices, and the number used in one electronic device is large. In recent years, with the miniaturization and high performance of devices, there has been an increasing demand for more miniaturized, large capacitance, low cost, and high reliability multilayer ceramic capacitors. [0003] For dielectric ceramic compositions having high permittivity and flat capacitance-temperature characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/50H01G4/12
CPCC04B35/4682H01G4/1227C04B35/468
Inventor 佐藤茂树寺田佳弘藤川佳则
Owner TDK CORPARATION
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