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XnR wide-temperature and high-stability BaTiO3-based dielectric ceramic and preparation method thereof

A dielectric ceramic, high stability technology, applied in the field of BaTiO3-based dielectric ceramics and its preparation, can solve the problems of low dielectric constant, high temperature end can not reach 200 ℃, low "core-shell" structure formation rate, etc. Effect of temperature range, high room temperature dielectric constant

Active Publication Date: 2018-08-14
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, the formation rate of "core-shell" structure is low, and the preparation method is complicated
The invention patent with the patent number 201010137504.X discloses a new type of lead-free X8R capacitor ceramic material and its preparation method. The invention focuses on xBi(Mg 1 / 2 Ti 1 / 2 )O 3 -(1-x)BaTiO 3 system, its performance meets the requirements of X8R (-55 ° C ~ 156 ° C), but the high temperature end cannot meet the requirements of 200 ° C
Similarly, the invention with the patent number 201110145367.9 uses the sol-gel method to prepare BaTiO 3 -Nb 2 o 5 -Co 2 o 3 -Sm 2 o 3 -CeO 2 Powder and 0.5BaTiO 3 -0.5Bi(Mg 1 / 2 Ti 1 / 2 )O 3 Powder, the invention also focuses on xBi(Mg 1 / 2 Ti 1 / 2 )O 3 -(1-x)BaTiO 3 system, its performance meets the requirements of X8R (-55 ° C ~ 156 ° C), but the invention has many steps and the high temperature end cannot meet the requirements of 200 ° C
The invention patent with the patent number of 201410339048.5 discloses an ultra-wide temperature and high stability lead-free capacitor ceramic dielectric material and its preparation method. The invention involves xBiAlO 3 -(1-x)BaTiO 3 (prepared by sol-gel method), the capacity temperature change rate does not exceed ±15% temperature range: -55~443℃, but its dielectric constant is low (~600)

Method used

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  • XnR wide-temperature and high-stability BaTiO3-based dielectric ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] a BaTiO 3 Base dielectric ceramics, the chemical composition is (1-y)BaTi 1-x Ca x o 3-x -yBi(Zn 0.5 Ti 0.5 )O 3 , x=0.04, y=0.1.

[0044] The aforementioned BaTiO 3 The preparation method of substrate ceramics, comprises the steps:

[0045] (1) Preparation of BaTi 0.96 Ca 0.04 o 2.96 Powder: according to BaTi 0.96 Ca 0.04 o 2.96 Chemical composition weighing raw material: BaCO 3 (99%), TiO 2 (99%), CaCO 3 (99%), the weighed raw materials are put into the planetary ball mill tank, mixed with a certain proportion of absolute ethanol and zirconium balls for ball milling, the specific parameters are: the ball milling time is 8h, and the rotating speed is 1200r / min;

[0046] Pour the ball-milled slurry into a beaker and dry it in a blast drying oven for 24 hours. The oven temperature is set at 100°C. The dried powder is crushed with a mortar, and then placed in a round crucible at 1190°C. Pre-fired for 2 hours; the pre-fired powder was ball milled twice and...

Embodiment 2

[0052] a BaTiO 3 Base dielectric ceramics, the chemical composition is (1-y)BaTi 1-x Ca x o 3-x -yBi(Zn 0.5 Ti 0.5 )O 3 , x=0.04, y=0.13.

[0053] The aforementioned BaTiO 3 The preparation method of substrate ceramics, comprises the steps:

[0054] (1) Preparation of BaTi 0.96 Ca 0.04 o 2.96 Powder, according to BaTi 0.96 Ca 0.04 o 2.96 Chemical composition weighing raw material: BaCO 3 (99%), TiO 2 (99%), CaCO 3 (99%), the weighed raw material is put into the planetary ball mill jar, and the planetary ball mill is used, and the raw material is mixed with a certain proportion of absolute ethanol and zirconium balls for ball milling. The specific parameters are: the ball milling time is 8h, and the rotating speed is 1200r / min;

[0055] Pour the ball-milled slurry into a beaker and dry it in a blast drying oven for 20 hours. The oven temperature is set at 100°C. The dried powder is then crushed with a mortar and placed in a round crucible at 1190°C. Pre-fired for...

Embodiment 3

[0061] a BaTiO 3 Base dielectric ceramics, the chemical composition is (1-y)BaTi 1-x Ca x o 3-x -yBi(Zn 0.5 Ti 0.5 )O 3 , x=0.04, y=0.15.

[0062] The aforementioned BaTiO 3 The preparation method of substrate ceramics, comprises the steps:

[0063] (1) Preparation of BaTi 0.96 Ca 0.04 o 2.96 Powder, according to BaTi 0.96 Ca 0.04 o 2.96 Chemical composition weighing raw material: BaCO 3 (99%), TiO 2 (99%), CaCO 3 (99%), the weighed raw material is put into the planetary ball mill jar, and the planetary ball mill is used, and the raw material is mixed with a certain proportion of absolute ethanol and zirconium balls for ball milling. The specific parameters are: the ball milling time is 8h, and the rotating speed is 1200r / min;

[0064] Pour the ball-milled slurry into a beaker and dry it in a blast drying oven for 24 hours. The oven temperature is set at 100°C. The dried powder is crushed with a mortar and placed in a round crucible at 1250°C. Pre-fired for 2 ...

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Abstract

The invention relates to XnR wide-temperature and high-stability BaTiO3-based dielectric ceramic and a preparation method thereof. A chemical composition of a ceramic material is (1-y)BaTi1-xCaxO3-x-yBi(Zn0.5Ti0.5)O3 ceramic, wherein x is equal to 0.04 to 0.05 and y is equal to 0.1 to 0.15. The dielectric ceramic has the characteristics of good performance, low cost, high stability in a wide temperature range and the like; especially, when the x is equal to 0.04 to 0.05 and the y is equal to 0.15, a ceramic capacitor dielectric material meeting an X9R characteristic is prepared.

Description

technical field [0001] The invention relates to a kind of BaTiO with wide temperature and high stability of XnR 3 The base dielectric ceramic and its preparation method are mainly used in the field of electronic components such as multilayer ceramic capacitors. Background technique [0002] BaTiO 3 Ceramics and their solid solutions have excellent insulation, ferroelectric properties and environmental friendliness. They are currently the best choice for preparing XnR series (X7R: -55~125℃, ΔC / C≤±15%, X8R: -55~150℃, ΔC / C ≤±15%, X9R: -55~200℃, ΔC / C≤±15%) The most commonly used system for ceramic capacitor materials. [0003] At present, the dielectric materials used to manufacture such large-capacity thermally stable MLCCs are mainly concentrated on Nb, Co and other oxides, BaTiO 3 with BaTiO 3 -Bi(Me)O 3 (Me=Al,Sc,(Ti 1 / 2 Zn 1 / 2 ),(Ti 1 / 2 Mg 1 / 2 ), etc.) and so on form a material with a "core-shell" structure. However, the formation rate of the "core-shell" structur...

Claims

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Application Information

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IPC IPC(8): C04B35/468
CPCC04B35/468C04B2235/3284C04B2235/3298C04B2235/442C04B2235/6562C04B2235/96
Inventor 郝华杨洋刘韩星罗智平陈程曹明贺尧中华
Owner WUHAN UNIV OF TECH
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