Barium titanate dielectric powder, method for manufacturing the same, method for manufacturing ceramic green sheet, and method for manufacturing laminated ceramic capacitor

A manufacturing method and dielectric technology, applied in the direction of laminated capacitors, fixed capacitor dielectrics, fixed capacitor parts, etc., can solve the problems of inability to improve the reliability of the dielectric constant temperature characteristics, and achieve the suppression of grain growth and temperature characteristics Flat, reliable effect

Active Publication Date: 2010-09-22
MURATA MFG CO LTD
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  • Application Information

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Problems solved by technology

[0010]However, as in the above-mentioned prior art, only by using an atmosphere in which the partial pressure of carbon dioxide during calcining of barium titanate is set to 400 to 1000 ppm, it may not be possible to The temperature characteristics of the dielectric constant and the reliability under high temperature and high electric field conditions are fully improved

Method used

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  • Barium titanate dielectric powder, method for manufacturing the same, method for manufacturing ceramic green sheet, and method for manufacturing laminated ceramic capacitor
  • Barium titanate dielectric powder, method for manufacturing the same, method for manufacturing ceramic green sheet, and method for manufacturing laminated ceramic capacitor
  • Barium titanate dielectric powder, method for manufacturing the same, method for manufacturing ceramic green sheet, and method for manufacturing laminated ceramic capacitor

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Embodiment 1

[0053] Prepare BaCO 3 、TiO 2 As a starting material, it weighed and mixed so that the ratio of Ba and Ti may become Ba / Ti=1.01 (atomic ratio). Then, use a ball mill (using PSZ abrasives with a diameter of 2mm) to mix the raw materials, and heat-treat at 900-1050°C in the atmosphere to synthesize the general formula Ba 1.01 TiO 3 Represented barium titanate compound.

[0054] Next, by pulverizing the barium titanate-based compound, barium titanate-based compound powders (Ba 1.01 TiO 3 powder).

[0055] Next, the above Ba 1.01 TiO 3 100 g of the powder was put into a container together with 100 g of water, and immersed in water while stirring for the time (1 to 120 hours) shown in Table 1. Specifically, stirring is achieved by adding Ba 1.01 TiO 3 Powder and water are then swirled. In addition, this process is not accompanied by pulverization (only stirring), and the barium titanate compound powder (Ba 1.01 TiO 3 powder) in the process of immersing in water.

[005...

Embodiment 2

[0101] Prepare BaCO 3 、TiO 2 As a starting material, it weighed and mixed so that the ratio of Ba and Ti may become Ba / Ti=1.000 (atomic ratio). Then, use a ball mill (using PSZ abrasives with a diameter of 2mm) to mix the raw materials, and heat-treat at 1000°C in the atmosphere to synthesize the general formula BaTiO 3 Represented barium titanate.

[0102] Next, by pulverizing the barium titanate, barium titanate powder (BaTiO 3 powder).

[0103] Alternatively, prepare BaZrO 3 、BaCO 3 、Gd 2 o 3 、Dy 2 o 3 , MnCO 3 , MgCO 3 , SiO 2 as an added ingredient.

[0104] Next, the barium titanate powder (BaTiO 3 Powder) 100g, according to the following proportions, mix selected from the above-mentioned additive group, that is, selected from BaZrO 3 、BaCO 3 、Gd 2 o 3 、Dy 2 o 3 , MnCO 3 , MgCO 3 , SiO 2 Each sample (raw material powder of barium titanate-based dielectric material) of sample numbers 10 to 13 in Table 2 was prepared for the additive components in Ta...

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Abstract

The present invention provides a barium titanate dielectric powder which can form dielectric ceramic with flattened temperature characteristic of dielectric constant and excellent reliability in the high-temperature and high-electrical-field state, a method for manufacturing a ceramic green sheet, and a method for manufacturing a laminated ceramic capacitor. In the barium titanate dielectric powder of the invention, the surface of BaTiO3 powder is coated by the barium compound which contains BaCO3 and BaO with a proportion of BaCO3 / BaO=0.55 in molar ratio. In the invention, the BaTiO3 powder is prepared. Then the BaTiO3 powder is soaked in aqueous solvent for more than 16 hours. Furthermore the BaTiO3 powder which is added with additives for adjusting the characteristic can be used as the BaTiO3 powder. Then the sheet forming slurry with barium titanate dielectric powder, adhesive base material and dispersion medium is prepared. Then the slurry is shaped to sheet for preparing the ceramic green sheet.

Description

technical field [0001] The present invention relates to a dielectric ceramic raw material powder and a method for producing the same, and more specifically, to a barium titanate-based dielectric raw material powder used in laminated ceramic capacitors, etc. A method of manufacturing a ceramic green sheet of a raw material powder, and a method of manufacturing a multilayer ceramic capacitor using the ceramic green sheet. Background technique [0002] As a dielectric material, barium titanate (BaTiO 3 )-based dielectric ceramics are widely used in electronic components such as multilayer ceramic capacitors. [0003] Furthermore, when this barium titanate-based dielectric ceramic is used as a dielectric material, in order to improve various electrical characteristics, various subcomponents (for example, rare earth elements, Mg, Mn, etc.) Add to. [0004] Especially in order to take into account the temperature characteristics of the dielectric constant and the reliability un...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/626B28B1/00H01G4/12H01G4/30
Inventor 井上德之中村将典小中宏泰田村刚
Owner MURATA MFG CO LTD
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