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Dielectric ceramic and its producing and estimating method, and monolithic ceramic electronic element

一种介电陶瓷、陶瓷的技术，应用在介电陶瓷及其制造和评价,及单片陶瓷电子元件领域，能够解决可靠性降低等问题，达到高抵抗力的效果

Inactive Publication Date: 2005-05-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the insulation resistance at room temperature or high temperature decreases, resulting in a significant decrease in reliability

Method used

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  • Dielectric ceramic and its producing and estimating method, and monolithic ceramic electronic element
  • Dielectric ceramic and its producing and estimating method, and monolithic ceramic electronic element
  • Dielectric ceramic and its producing and estimating method, and monolithic ceramic electronic element

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0081] with BaTiO 3 as an ABO 3 , use (Ba 0.99 Dy 0.01 )TiO 3 as modified ABO 3 , and with Dy 2 o 3 -NiO-MnO 2 -SiO 2 as an additive.

[0082] Weigh barium carbonate (BaCO 3 ) and titanium dioxide (TiO 2 ). These compounds were mixed with deionized water in a ball mill for 24 hours, and the water was evaporated to prepare a powder mixture. This powder mixture was calcined in air at 1000°C and ground to form BaTiO 3 powder.

[0083] Weigh barium carbonate (BaCO 3 ), titanium dioxide (TiO 2 ) and dysprosium oxide (Dy 2 o 3 ), these compounds were mixed with deionized water in a ball mill for 24 hours, and the water was evaporated to prepare a powder mixture. This powder mixture was calcined in air at 1000°C and ground to form (Ba 0.99 Dy 0.01 )TiO 3 powder.

[0084] Mix BaTiO with a molar ratio of 50:50 3 Powder and (Ba 0.99 Dy 0.01 )TiO 3 powder. With respect to 100 moles of this mixture in total, 0.75 moles of powdered Dy 2 o 3 , 0.5 moles of powde...

example 2

[0088] With (Ba 0.95 Sr 0.05 )TiO 3 powder as ABO 3 , (Ba 0.93 Sr 0.05 Gd 0.02 )TiO 3 powder as modified ABO 3 , and with Ho 2 o 3 -Cr 2 o 3 -MgO-SiO 2 powder as an additive. Prepare as example 1 (Ba 0.95 Sr 0.05 )TiO 3 Powder and (Ba 0.93 Sr 0.05 Gd 0.02 )TiO 3 powder.

[0089] Mix according to the molar ratio of 70:30 (Ba 0.95 Sr 0.05 )TiO 3 Powder and (Ba 0.93 Sr 0.05 Gd 0.02 )TiO 3 powder. With respect to 100 mol of this mixture, 0.8 mol of powdered Ho was added 2 o 3 , 0.5 moles of powdered Cr 2 o 3 , 0.5 moles of powdered MgO, 2.0 moles of powdered SiO 2 , to prepare base metal powders for dielectric ceramics.

example 3

[0093] With (Ba 0.95 Ca 0.05 )(Ti 0.95 Zr 0.04 f 0.01 )O 3 powder as ABO 3 , and with (Ba 0.93 Ca 0.05 SM 0.02 )(Ti 0.95 Zr 0.04 f 0.01 )O 3 powder as modified ABO 3 , and with Ho 2 o 3 -MgO-MnO 2 -B 2 o 3 -SiO 2 powder as an additive. Prepare as example 1 (Ba 0.95 Ca 0.05 )(Ti 0.95 Zr 0.04 f 0.01 )O 3 Powder and (Ba 0.93 Ca 0.05 SM 0.02 )(Ti 0.95 Zr 0.04 f 0.01 )O 3 powder.

[0094] Mix according to the molar ratio of 35:65 (Ba 0.95 Ca 0.05 )(Ti 0.95 Zr 0.04 f 0.01 )O 3 Powder and (Ba 0.93 Ca 0.05 SM 0.02 )(Ti 0.95 Zr 0.04 f 0.01 )O 3 powder. With respect to 100 mol of this mixture, 0.5 mol of powdered Ho was added 2 o 3 , 1.0 moles of powdered MgO, 0.3 moles of powdered MnO 2 , 0.5 moles of powdered B 2 o 3 , 2.0 moles of powdered SiO 2 , The base metal powder used in the preparation of dielectric ceramics.

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Abstract

Dielectric ceramics, which have a ceramic structure consisting of crystalline grains and grain boundaries between the crystalline grains. The crystal particles include the structural formula ABO 3 Indicates the main components and additives containing rare earth elements, wherein A is at least one of barium, calcium and strontium, and barium is the basic element; B is at least one of titanium, zirconium and hafnium, and titanium is the basic element. The average rare earth element concentration inside the crystal grains is about 50% or less of the average rare earth element concentration at the grain boundaries. And about 20%-70% of the crystal grains have a rare earth element concentration at the center of the crystal grain that is at least about 1 / 50 of the maximum rare earth element concentration in a region extending inwardly from the surface at a distance equivalent to about 5% of the crystal grain diameter.

Description

technical field [0001] The present invention relates to dielectric ceramics, methods of making and evaluating the same, and monolithic ceramic electronic components. In particular, it relates to a thin monolithic ceramic electronic component, such as a thin monolithic ceramic capacitor. Background technique [0002] As an example of a monolithic ceramic electronic component to which the present invention relates, a monolithic ceramic capacitor is generally produced as follows. [0003] Green ceramic sheets were prepared, each composed of a dielectric ceramic material and provided with an internal electrode pattern of a conductive material. This dielectric ceramic material can be, for example, BaTiO 3 . [0004] A plurality of green ceramic sheets including the above-mentioned sheet provided with an internal electrode pattern were stacked and hot-pressed to form a green composite. [0005] The green composite body was fired to prepare a sintered composite body having inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/46C04B35/468C04B35/48H01G4/12
CPCB32B18/00B32B2311/08C04B35/4682C04B35/48C04B2235/3203C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3236C04B2235/3239C04B2235/3241C04B2235/3262C04B2235/3267C04B2235/3272C04B2235/3275C04B2235/3279C04B2235/3409C04B2235/3418C04B2235/36C04B2235/6582C04B2235/6584C04B2235/785C04B2235/786C04B2235/85C04B2237/346C04B2237/408C04B2237/704H01G4/1227H01G4/1245H01G4/12
Inventor 小中宏泰中村友幸冈松俊宏佐野晴信
Owner MURATA MFG CO LTD