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Multilayer ceramic capacitor

A ceramic capacitor, stacked type technology, applied in the direction of stacked capacitors, multiple fixed capacitors, fixed capacitor dielectrics, etc., can solve the problem of not being fully applicable to motor vehicle electronic devices

Inactive Publication Date: 2006-01-04
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although BaTiO 3 It is a high-dielectric material that can meet the EIA standard X7R characteristics (-55 to 125°C, ΔC / C = within ±15%), but it cannot be said to be fully suitable for automotive electronic devices used in the above-mentioned harsh environments

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0080] (1) Preparation of sheet-like laminate (device body)

[0081] When the so-called printing method is applied, the paste for forming a dielectric layer and the paste for forming an internal electrode layer are sequentially laminated and printed on a support such as polyethylene terephthalate. At this time, the first internal electrode layer 11 and the second internal electrode layer 15 are respectively as follows: figure 2 or image 3 As shown, printing is performed on the outer frame of the paste for forming a dielectric layer so as to obtain a predetermined form. After the dielectric layer and the internal electrode layer are sequentially laminated and printed, they are cut into a sheet in a predetermined shape, and then peeled off from the support to form a sheet-shaped laminate (prototype of the element body).

[0082] In addition, when the so-called sheet method is employed, a plurality of dielectric green sheets are formed using a paste for forming a dielectric l...

Embodiment 1

[0119] As starting materials for the preparation of dielectric materials, main component materials (BaTiO 3 ) and raw materials for the first to seventh subcomponents.

[0120] MgCO is used as the first subcomponent raw material 3 ,

[0121] Used as the second subcomponent raw material (Ba 0.6 Ca 0.4 ) SiO 3 ,

[0122] Use V as the third subcomponent raw material 2 o 5 ,

[0123] Yb is used as the raw material of the fourth subcomponent (R1) 2 o 3 ,

[0124] CaZrO is used as the fifth subcomponent raw material 3 and organometallic salts of Ca and Zr,

[0125] Use Y as the sixth subcomponent (R2) raw material 2 o 3 ,

[0126] MnCO is used as the seventh subcomponent raw material 3 .

[0127] In addition, the second subcomponent raw material (Ba 0.6 Ca 0.4 ) SiO 3 was prepared as follows: BaCO 3 , CaCO 3 and SiO 2 It was placed in a ball mill for 16 hours of wet mixing, then dried, sintered in air at 1150° C., and then placed in a ball mill for 100 hours o...

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Abstract

The multilayer ceramic capacitor of the present invention has: a main component containing barium titanate, a first subcomponent containing at least one selected from MgO, CaO, BaO, and SrO, and a second subcomponent containing silicon dioxide as a main component. 2 subcomponents, and the third subcomponent containing at least one selected from V2O5, MoO3, and WO3, and the first rare earth element (R1) containing at least one selected from Sc, Er, Tm, Yb, and Lu (R1) oxidation The fourth subcomponent of the substance, and the fifth subcomponent containing CaZrO3 or a mixture of CaO and ZrO2 (CaO+ZrO2), and constituted as follows: Zr is diffused in the crystal particles constituting the above-mentioned dielectric layer, and the average particle diameter of the crystal particles Among them, the depth of the Zr diffusion layer is 10 to 35% of the diameter of the crystal grains, so the capacity temperature characteristics as an indicator of the change in capacity over time satisfy the EIA standard X8R characteristics (-55 to 150 ° C, ΔC / C = ± Within 15%), and in the accelerated test, the resistance change rate is small (the average life is long), and the reliability is excellent.

Description

technical field [0001] The present invention relates to a multilayer ceramic capacitor, and particularly relates to a capacity-temperature characteristic that satisfies the EIA standard X8R characteristic (-55 to 150°C, ΔC / C=±15%) as a capacity change over time, and the resistance change rate in the accelerated test Small (long average life), multilayer ceramic capacitors with excellent reliability. Background technique [0002] As electronic components, for example, multilayer ceramic capacitors (multilayer chip capacitors) are widely used as small, large-capacity, and highly reliable electronic components. In recent years, along with the miniaturization and high performance of equipment, the requirements for further miniaturization, larger capacity, lower price, and higher reliability of multilayer ceramic capacitors have become more and more stringent. [0003] In multilayer ceramic capacitors, the paste for forming the internal electrode layer and the paste for forming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/30H01G4/38C04B35/468C04B35/638H01G4/06
CPCC04B2235/3239C04B2235/3454C04B2235/3409C04B2235/3206C04B2237/40C04B2235/3215C04B35/4682C04B2237/704C04B2235/3217C04B2235/6582C04B2235/3213C04B2235/6584C04B2237/346C04B2235/3249C04B2235/3203C04B2235/3262C04B2235/3224C04B2235/785C04B2235/782C04B2235/3418B32B2311/22C04B2237/706C04B2235/662C04B2235/3205C04B2235/3208C04B2235/3427C04B2235/72C04B2237/405C04B35/638C04B35/64C04B2235/3445C04B2237/12C04B35/62665C04B2235/3258C04B2235/6588C04B2235/3436C04B2235/3241C04B2235/3256C04B2235/3225B32B18/00C04B2235/3244H01G4/232H01G4/12
Inventor 伊東和重佐藤阳
Owner TDK CORPARATION
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