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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
  • Description
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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 described in Patent Document 1 (a method of aggregating ceramic fine particles under predetermined conditions), it is difficult to obtain a powder with a small particle diameter variation in the region of 100 nm or less in particle diameter.

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

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Experimental program
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Effect test

experiment 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 are then mixed in a ball mill for 24 hours, and then heat-treated, using a solid-state reaction to obtain BaTiO 3 powder. BaTiO 3 The target particle size of the powder is 6 grades of 10nm, 30nm, 70nm, 100nm, 150nm and 200nm.

[0045] (B) Grading treatment of barium titanate powder

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

[0047] In addition, BaTiO obtained in the above-mentioned (A) process and having target particle diameters of 10 nm, 30 nm, 70 nm, 100 nm, 150 nm, and 200 nm were respectively 3 Put the powder into pure water as a dispersion medium in the flask to disperse it, and after standing for a certain period of time, place the BaTiO 3 T...

experiment example 2

[0078] In Experimental Example 2, the (A) preparation of barium titanate powder, (B) classification treatment of barium titanate powder, and (C) preparation of dielectric ceramic raw material powder in Experimental Example 1 were used as they were. The dielectric ceramic raw material powder obtained in 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, the same procedure as in Experimental Example 1 was performed except that the thickness of the ceramic green sheet was set so as to be 0.3 μm after firing in the production of (D) multilayer ceramic capacitor in Experimental Example 1. (D) The process of producing a multilayer ceramic capacitor is carried out.

[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 Example 1 as it is....

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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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