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Insulating ceramic and its preparation method, and multi-layer ceramic capacitor

A technology of insulating ceramics and internal electrodes, which is applied in the direction of laminated capacitors, capacitors, fixed capacitors, etc., can solve the problems of increased electrostatic capacitance, etc., and achieve the effects of high insulation resistance, low dielectric loss, and long insulation life

Inactive Publication Date: 2002-05-22
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce the size of the multilayer ceramic capacitor and increase the capacitance, as the thickness of each insulating ceramic sheet of the multilayer ceramic capacitor decreases, the DC field strength of each insulating ceramic sheet increases, and its electrostatic capacitance increases with time. The change further increases

Method used

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  • Insulating ceramic and its preparation method, and multi-layer ceramic capacitor
  • Insulating ceramic and its preparation method, and multi-layer ceramic capacitor
  • Insulating ceramic and its preparation method, and multi-layer ceramic capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0068] First, weigh a certain weight of TiCl as the starting material for the preparation of the main component 4 and Ba(NO 3 ) 2 , react the two with oxalic acid to obtain a tetrahydrate barium titanyl oxalate BaTiO(C 2 o 4 )·4H 2 Precipitation of O. Decompose the precipitate by heating at 1000°C or higher to obtain BaTiO 3 , the BaTiO 3 Grinding to get BaTiO 3 powder.

[0069] In the ball mill, the auxiliary component Dy 2 o 3 , NiO, MnO 2 and SiO 2 According to the proportions in Table 1, wet mixing was carried out respectively, and the obtained mixture was calcined at 1000° C. for 2 hours, and then ground to obtain calcined co-component powder.

[0070] According to the ratio shown in Table 1, the BaTiO 3 The powder and the calcined co-component powder are mixed to obtain a powder mixture as an insulating ceramic raw material powder.

[0071]In a ball mill, a polyvinyl butyral binder and an organic solvent such as ethanol are added to the powder mixtur...

Embodiment 3

[0082] Adopt the method for embodiment 1 to prepare multilayer ceramic capacitor, difference is to adopt respectively as shown in table 1 (Ba 0.90 Ca 0.10 )(Ti 0.90 Zr 0.09 f 0.01 )O 3 as an ABO 3 Components, (Y 2 o 3 , Tm 2 o 3 )-NiO-SiO 2 As an auxiliary component, MgO was used as an added component, and fired at the temperature shown in Table 2 to obtain a multilayer ceramic capacitor. In this process, ABO 3 Components used (Ba 0.90 Ca 0.10 )(Ti 0.90 Zr 0.09 f 0.01 )O 3 By mixing BaO, CaO, TiO 2 , ZrO 2 and HfO 2 And calcined the resulting mixture to prepare. Comparative example 3

Embodiment 4

[0085] Adopt the method for embodiment 1 to prepare multilayer ceramic capacitor, difference is to adopt respectively as shown in table 1 (Ba 0.95 Sr 0.05 )(Ti 0.95 Zr 0.05 )O 3 as an ABO 3 Components, (Er 2 o 3 , MnO 2 ) as auxiliary component, V 2 o 5 , SiO 2 and MgO as additional components, and fired at the temperature shown in Table 2 to obtain multilayer ceramic capacitors. In this process, ABO 3 Components used (Ba 0.95 Sr 0.05 )(Ti 0.95 Zr 0.05 )O 3 By mixing BaO, SrO, TiO 2 and ZrO 2 And calcined the resulting mixture to prepare. Comparative example 4

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Abstract

A dielectric ceramic includes ABO3 as a major component and R and M as accessory components, where A is at least one of Ba, Sr and Ca; B is at least one of Ti, Zr and Hf; R is at least one of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y; and M is at least one of Ni, Co, Fe, Cr and Mn. The dielectric ceramic contains the components R and M at about 70% or more of analysis points in grain boundaries. This dielectric ceramic is suitable for use in dielectric ceramic layers of a multilayer ceramic capacitor obtained by firing in a reducing atmosphere, has a long life at high temperatures and high voltages, exhibits less time-dependent change in electrostatic capacity under application of a direct-current voltage and has satisfactory reliability even when its thickness is reduced.

Description

technical field [0001] The present invention relates to an insulating ceramic, a preparation method of the insulating ceramic, and a multilayer ceramic capacitor using the insulating ceramic, in particular to an improvement beneficial to reducing the thickness of the insulating ceramic layer of the multilayer ceramic capacitor. Background technique [0002] Multilayer ceramic capacitors generally employ the following manufacturing methods. [0003] First, a ceramic green sheet containing an insulating ceramic material is prepared. A patterned conductive material is carried on the surface of each ceramic green sheet to constitute internal electrodes. The insulating porcelain used in the preparation process mainly contains such as BaTiO 3 . [0004] Lamination and hot pressing of multiple layers of ceramic green sheets including ceramic green sheets loaded with conductive material yields a monolithic (monolithic) multilayer compact. [0005] Then, the above-mentioned multi...

Claims

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Application Information

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IPC IPC(8): C04B35/46B32B18/00C04B35/468H01G4/12
CPCH01G4/1245H01G4/1236H01G4/1227B32B18/00C04B35/4682C04B2235/6567C04B2235/658C04B2237/346C04B2237/66C04B2237/704H01G4/12
Inventor 中村友幸酒井健太郎佐野晴信
Owner MURATA MFG CO LTD
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