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Multilayer ceramic capacitor and manufacturing method thereof

A technology of ceramic capacitors and manufacturing methods, applied in the direction of laminated capacitors, fixed capacitor electrodes, fixed capacitor dielectrics, etc., can solve problems such as unsatisfactory, and achieve the effect of inhibiting the reaction

Active Publication Date: 2006-02-01
KYOCERA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the multilayer ceramic capacitor disclosed in Japanese Patent Laid-Open No. 2001-230149, due to the use of pre-mixed and baked BaTiO 3 The preparatory process of MgO can increase the dielectric constant of dielectric ceramics, and even in terms of capacitance temperature characteristics, it can better satisfy B characteristics (temperature range: -25°C to 85°C, capacitance change rate within ±10%) , but at present, in terms of capacitance temperature characteristics, X7R with a wide temperature range cannot be satisfied (temperature range: -55°C to 125°C, capacitance change rate within ±15%)
[0009] Secondly, in the dielectric ceramics described in JP-A-9-241075, the dielectric constant can only be increased to about 2100 at best due to the micronization of the dielectric particles.

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  • Multilayer ceramic capacitor and manufacturing method thereof

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no. 1 Embodiment approach

[0040] refer to figure 1 A schematic cross-sectional view of FIG. 2 will describe in detail the multilayer ceramic capacitor of this embodiment. The multilayer ceramic capacitor of the present invention is constituted by forming external electrodes 3 at both ends of a capacitor body 1 . The external electrodes 3 are formed, for example, by sintering Cu or an alloy paste of Cu and Ni.

[0041] Capacitor body 1 is formed by alternately laminating dielectric layers 5 and internal electrode layers 7 . The dielectric layer 5 is composed of dielectric particles 11 mainly composed of Ba and Ti having a low concentration of alkaline earth metals other than Ba, dielectric particles 13 mainly composed of Ba and Ti having a high concentration of alkaline earth metals other than Ba, and Grain boundary phase 15 constitutes. The thickness of the dielectric layer 5 is preferably 4 μm or less, and more preferably 3 μm or less from the viewpoint of increasing the capacitance. In addition, ...

no. 2 Embodiment approach

[0067] A second embodiment of the present invention will be described. The multilayer ceramic capacitor of the second embodiment has the same figure 1 composition shown.

[0068] In the present embodiment, BaTiO having an alkaline earth metal component concentration other than Ba ​​of 0.2 atomic % or less coexists. 3 Particles (BMTL), and BaTiO having a concentration of alkaline earth metal components other than Ba ​​of 0.4 atomic % or more, preferably 0.5 to 2.5 atomic % 3 Particles (BMTH). Importantly, when the average particle diameter of BMTL is defined as DL and the average particle diameter of BMTH is defined as DH, DL>DH, especially DL / DH=1.1-2.

[0069] If the alkaline earth metal component concentration of BMTL particles exceeds 0.2 atomic %, and the alkaline earth metal component concentration of BMTH is less than 0.4 atomic %, the alkaline earth metal component concentrations of BMTL and BMTL are large, and it is difficult to find the dielectric strength of diele...

Embodiment 1

[0093] A multilayer ceramic capacitor is fabricated as follows. First, pre-prepared BaTiO 3 (BT) and (Ba 0.95 Ca 0.05 )TiO 3 (BCT). In BaTiO 3 Add and mix 0.25 mole parts of MgO to the powder, and heat at the temperature shown in Table 1 for 2 hours. Next, relative to the calcined BaTiO 3 Powder and (Ba 0.95 Ca 0.05 )TiO 3 100 moles of powder, mixed with 0.5 moles of Y 2 o 3 , 0.3 moles of MnCO 3 , 0.25 moles of MgO, relative to BaTiO 3 Powder+(Ba 0.95 Ca 0.05 )TiO 3 100 parts by mass, mixed by Li 2 O, SiO 2 0.5 parts by mass of an additional component composed of CaO. Use ZrO with a diameter of 5mm 2 The ball mill wet-mills the mixed powder, adds an organic binder, and prepares a slurry.

[0094] Next, using the obtained slurry, a dielectric green sheet having a thickness of 2.5 μm was fabricated using an auxiliary plate. A conductive paste containing Ni metal was screen-printed on this dielectric green sheet to form internal electrode patterns. 388 diel...

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Abstract

The present invention provides a multilayer ceramic capacitor and its manufacturing method. The multilayer ceramic capacitor comprises a dielectric layer and an internal electrode layer that are alternately laminated. Barium titanate particles containing an alkaline earth metal component except for Ba in a proportion of not more than 0.2 atomic % (BMTL), and barium titanate particles containing an alkaline earth metal component except for Ba in a proportion of not less than 0.4 atomic % (BMTH) coexist in the dielectric layer in an area ratio of BMTL to BMTH of 0.1 to 9. This provides excellent reliability of capacity temperature characteristic and high-temperature load lifetime, if the dielectric layer is thinned.

Description

technical field [0001] The present invention relates to a multilayer ceramic capacitor and its manufacturing method. In particular, it relates to the capacitance temperature characteristics and high temperature characteristics of alternately laminating very thin dielectric layers and internal electrode layers, which are used in high-performance electronic equipment such as computers and mobile phones. A small-sized high-capacity multilayer ceramic capacitor excellent in reliability such as load life and a method for manufacturing the same. Background technique [0002] In recent years, with the miniaturization and high performance of electronic equipment, the multilayer ceramic capacitors used in them are also required to be small and high-capacity. Therefore, the number of stacked layers of dielectric layers and internal electrode layers is increased, and the thickness of the dielectric layer body is reduced. In addition, even as characteristics of multilayer ceramic capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/008H01G4/30
Inventor 藤冈芳博松原圣
Owner KYOCERA CORP
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