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Laminated ceramic capacitor

A technology of ceramic capacitors and laminates, applied in the direction of multilayer capacitors, capacitors, fixed capacitors, etc., can solve other problems such as low characteristics, and achieve the effects of excellent dielectric constant, high insulation, and excellent insulation reliability.

Active Publication Date: 2014-12-24
TAIYO YUDEN KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, especially when the method of increasing the dielectric constant by changing the composition ratio of the subcomponents is adopted, there are disadvantages such as lowering other characteristics even though the dielectric constant is increased.

Method used

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  • Laminated ceramic capacitor
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Experimental program
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Embodiment

[0062] Hereinafter, the present invention will be described in more detail through examples, but the scope of the present invention is not limited by these examples.

[0063] Prepare BaTiO 3 powder as the main component, prepare SiO 2 , MgO, Ho 2 o 3 , MnO as a subcomponent. These were weighed so that the composition of Table 1 below was obtained, wet-mixed with a ball mill, dried, and calcined at 400° C. to obtain ceramic powder.

[0064] [Table 1]

[0065]

BaTiO 3

SiO 2

MgO

Ho 2 o 3

MnO

sample 1

100

1.5

0.5

0.4

0.1

sample 2

100

3

0.5

0.4

0.1

sample 3

100

1.5

0.3

0.4

0.1

[0066] In the ceramic powder, polyvinyl butyral resin, toluene, ethanol, and DOP were added and mixed to prepare a ceramic slurry. This ceramic slurry was sheeted by a roll coater to obtain a dielectric green sheet having a thickness of 3 μm.

[0067] On this dielectric green...

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Abstract

The purpose of the present invention is to provide a laminated ceramic capacitor for achieving a high dielectric constant and thin layers in order to meet the need for smaller size and greater capacity, and moreover having excellent dependability of insulating properties. The present invention relates to a laminated ceramic capacitor having: a laminate of dielectric layers and internal electrode layers laminated in alternating fashion; and cover layers formed as the outermost layers on the top and bottom in the stacking direction of the laminate. In this laminated ceramic capacitor, the dielectric layers comprise a sintered compact containing barium titanate and a silicon compound, and a fresnoite phase of average particle size of 1 [mu]m or less is present within the dielectric layers.

Description

technical field [0001] The invention relates to a laminated ceramic capacitor with high dielectric constant and high reliability. Background technique [0002] In recent years, there has been a growing demand for miniaturization of electronic components accompanying the increase in the density of electronic circuits used in digital electronic devices such as mobile phones, and the miniaturization and increase in capacitance of multilayer ceramic capacitors constituting these circuits are rapidly progressing. [0003] The capacitance of a multilayer ceramic capacitor is proportional to the dielectric constant of the material constituting the dielectric layer of the capacitor or the number of stacked dielectric layers, and inversely proportional to the thickness of each dielectric layer. Therefore, also in order to meet the demand for miniaturization, it is required to increase the dielectric constant of the material, to reduce the thickness of the dielectric layer, and to inc...

Claims

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Application Information

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IPC IPC(8): H01G4/12H01G4/30
CPCH01G4/1227H01G4/1209H01G4/30
Inventor 寺冈秀弥森田浩一郎水野洋一
Owner TAIYO YUDEN KK
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