Barium titanate powder, process for producing the same, dielectric ceramic, and laminated ceramic capacitor

A technology of dielectric ceramics and barium titanate, which is applied in the field of reliability of laminated ceramic capacitors, can solve problems such as difficulty in obtaining powder with particle size deviation, frequent occurrence of short circuit defects, and decreased insulation, and achieve good crystallinity and improved fault life characteristics , the effect that the integral width becomes smaller

Inactive Publication Date: 2010-10-13
MURATA MFG CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

If the particle size is so large, the thinning of the dielectric ceramic layer will result in frequent occurrence of short-circuit failures, or a significant decrease in life due to a decrease in insulation
[0006] In addition, in the method d

Method used

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  • Barium titanate powder, process for producing the same, dielectric ceramic, and laminated ceramic capacitor
  • Barium titanate powder, process for producing the same, dielectric ceramic, and laminated ceramic capacitor
  • Barium titanate powder, process for producing the same, dielectric ceramic, and laminated ceramic capacitor

Examples

Experimental program
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Example Embodiment

[0042] [Experimental Example 1]

[0043] (A) Production of barium titanate powder

[0044] First, barium titanate (BaTiO 3 )powder. That is, weighing BaCO 3 and TiO 2 The powders were then mixed with a ball mill for 24 hours, and then heat-treated to obtain BaTiO by a solid-phase reaction. 3 powder. BaTiO 3 The target particle size of the powder is 6 grades of 10 nm, 30 nm, 70 nm, 100 nm, 150 nm, and 200 nm.

[0045] (B) Classification of barium titanate powder

[0046] BaTiO with target particle diameters of 10 nm, 30 nm, 70 nm, 100 nm, 150 nm, and 200 nm, obtained in the step (A) above, was 3 The powders were used as samples 101, 105, 107, 111, 114 and 116 shown in Table 1, respectively.

[0047] In addition, BaTiO with target particle diameters of 10 nm, 30 nm, 70 nm, 100 nm, 150 nm, and 200 nm, obtained in the step (A) above, was used. 3 The powder was put into pure water as a dispersion medium in a flask to disperse, and after standing for a certain period of ti...

Example Embodiment

[0077] [Experimental example 2]

[0078] In Experimental Example 2, (A) production of barium titanate powder, (B) classification of barium titanate powder, and (C) production of dielectric ceramic raw material powder in Experimental Example 1 were used as they were. The dielectric ceramic raw material powder obtained by each process. Therefore, the sample number in Experimental Example 2 is shared with the sample number in Experimental Example 1.

[0079] In Experimental Example 2, it was the same as in the case of Experimental Example 1, except that the thickness of the ceramic green sheet was set to be 0.3 μm after firing in the preparation of the (D) laminated ceramic capacitor of Experimental Example 1. (D) The process of manufacturing a laminated ceramic capacitor is implemented.

[0080] The evaluation results of Experimental Example 2 are shown in Table 2, and Table 2 also shows the evaluation results of the (E-1) barium titanate powder implemented in Experimental Exa...

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Abstract

The aim of the invention is to reduce inferior insulation of laminated ceramic capacitor and improve failure lifetime characteristic in load test. The barium titanate powder which is used for obtaining dielectric ceramic of a dielectric layer 2 in the laminated ceramic capacitor 1 has sharp particle size distribution and satisfies the following states: the average particle diameter D1 is 10-200nm; 1.0<D2/D1</=2.0 and 0.5</=D3/D1<1.0 when a maximum particle diameter is set to D2 and a minimal particle diameter is set to D3. Therefore, the barium titanate powder has the following advantages: greatly improving the dispersivity in ceramic slurry, realizing density increase and surface smoothing of the dielectric ceramic layer 2 in the laminated ceramic capacitor 1, reducing inferior insulation and improving failure lifetime characteristic of load test.

Description

technical field [0001] The present invention relates to a barium titanate-based powder and a method for producing the same, a dielectric ceramic obtained by sintering the barium titanate-based powder, and a multilayer ceramic capacitor composed of the dielectric ceramic, and particularly to a method for improving the realization of small and large capacitors. Reliability technology for multilayer ceramic capacitors with increased capacity. Background technique [0002] In multilayer ceramic capacitors, as a method of increasing the capacitance per unit volume, thinning of the dielectric ceramic layer is mentioned. Thinning of the dielectric ceramic layer may lead to short-circuit defects and poor reliability. Therefore, it is effective to improve the density and smoothness of the dielectric ceramic layer. [0003] In order to densify the dielectric ceramic layer, first, it is necessary to granulate the dielectric ceramic powder contained in the dielectric ceramic layer. Fu...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/626H01G4/12H01G4/30
CPCC01G23/04C04B35/468C04B2235/3236H01G4/1227H01G4/30
Inventor 松田真井上勉中村友幸
Owner MURATA MFG CO LTD
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