Anti-reduction BaTiO3-based dielectric ceramic and preparation method thereof

A dielectric ceramic, batio3-xbi technology, which is applied in the field of anti-reduction BaTiO3-based dielectric ceramics and its preparation, can solve the problems of complex system material composition, poor temperature stability at high temperature end, unable to meet the requirements of 150 ℃, etc., and achieve excellent insulation performance. , High temperature stability, the effect of improving insulation resistivity

Active Publication Date: 2019-10-08
WUHAN UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0004] The invention patent of CN102531592A discloses an anti-reduction Y5P ceramic capacitor dielectric porcelain material, which focuses on Ba 1-x Zn x Ti 1-y Zr y o 3 system, the capacitance change rate is less than ±10% in the range of -30-85°C, but its temperature stability at the high temperature end is poor
The invention

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  • Anti-reduction BaTiO3-based dielectric ceramic and preparation method thereof
  • Anti-reduction BaTiO3-based dielectric ceramic and preparation method thereof
  • Anti-reduction BaTiO3-based dielectric ceramic and preparation method thereof

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[0035] Example 1

[0036] a BaTiO 3 Base dielectric ceramic, the chemical composition expression is 0.95BaTiO 3 -0.05Bi(Zn 1 / 2 Y 1 / 2 )O 2.75 , its preparation method specifically comprises the following steps:

[0037] (1) According to the composition expression, weigh 0.95mol BaTiO 3 , 0.0263mol Bi 2 O 3 (5% excess), 0.025mol ZnO and 0.0125mol Y 2 O 3 as a raw material;

[0038] (2) Put the weighed raw materials into a ball mill jar, use zirconia balls and absolute ethanol as a medium, and mill them on a planetary ball mill for 8 hours; then dry them at 100°C for 24 hours and then pre-burn them. The pre-burning process is as follows: Raise the temperature from room temperature to 850°C at a heating rate of 2°C / min, keep it warm for 2 hours, and then cool with the furnace; mill the pre-fired powder for a second time for 6 hours, and dry it at 100°C to obtain ceramic powder;

[0039] (3) in the ceramic powder of step (2) gained, add the polyvinyl alcohol aqueous solu...

Example Embodiment

[0045] Example 2

[0046] a BaTiO 3 Base dielectric ceramics, the chemical composition expression is 0.9BaTiO 3 -0.1Bi(Zn 1 / 2 Y 1 / 2 )O 2.75 , its preparation method specifically comprises the following steps:

[0047] (1) According to the composition expression, weigh 0.9mol BaTiO 3 , 0.0525mol Bi 2 O 3 (5% excess), 0.05mol ZnO and 0.025mol Y 2 O 3 as a raw material;

[0048] (2) Put the weighed raw materials into a ball mill jar, use zirconia balls and absolute ethanol as a medium, and mill them on a planetary ball mill for 8 hours; then dry them at 100°C for 24 hours and then pre-burn them. The pre-burning process is as follows: Raise the temperature from room temperature to 850°C at a heating rate of 2°C / min, keep it warm for 2 hours, and then cool with the furnace; mill the pre-fired powder for a second time for 6 hours, and dry it at 100°C to obtain ceramic powder;

[0049] (3) in the ceramic powder of step (2) gained, add the polyvinyl alcohol aqueous solution...

Example Embodiment

[0055] Example 3

[0056] a BaTiO 3 Base dielectric ceramics, the chemical composition expression is 0.85BaTiO 3 -0.15Bi(Zn 1 / 2 Y 1 / 2 )O 2.75 , its preparation method specifically comprises the following steps:

[0057] (1) According to the composition expression, weigh 0.85mol BaTiO 3 , 0.0788mol Bi 2 O 3 (5% excess), 0.075mol ZnO and 0.0375mol Y 2 O 3 as a raw material;

[0058] (2) Put the weighed raw materials into a ball mill jar, use zirconia balls and absolute ethanol as a medium, and mill them on a planetary ball mill for 8 hours; then dry them at 100°C for 24 hours and then pre-burn them. The pre-burning process is as follows: Raise the temperature from room temperature to 850°C at a heating rate of 2°C / min, keep it warm for 2 hours, and then cool with the furnace; mill the pre-fired powder for a second time for 6 hours, and dry it at 100°C to obtain ceramic powder;

[0059] (3) in the ceramic powder of step (2) gained, add the polyvinyl alcohol aqueous sol...

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Abstract

The invention relates to an anti-reduction BaTiO3-based dielectric ceramic and a preparation method thereof. The chemical formula of the dielectric ceramic is (1-x) BaTiO3-xBi (Zn1/2Y1/2) O2.75, wherein x= 0.05-0.25. The preparation method comprises the following steps: (1) taking BaTiO3, Bi2O3, ZnO and Y2O3 as raw materials, and proportioning the raw materials according to the stoichiometric ratio of metal atoms in the chemical formula; (2) uniformly ball-milling and mixing the raw materials, drying, and presintering the raw materials in a muffle furnace to obtain ceramic powder; (3) carryingout secondary ball milling on the ceramic powder obtained by presintering, drying, then granulating and pressing to obtain a ceramic green body; and (4) after adhesive discharge of the ceramic greenbody, introducing reducing gas into a tube furnace for sintering to obtain the anti-reduction BaTiO3-based dielectric ceramic. The dielectric ceramic is sintered in a reducing atmosphere and has the characteristics of excellent insulating property and dielectric property, low production cost, stable dielectric property in a wide temperature range and the like, particularly when x = 0.15, the dielectric ceramic has the insulation resistivity which reaches up to 5.5* 1012 omega.cm, and the dielectric temperature stability meets the X8R standard.

Description

technical field [0001] The invention relates to an anti-reduction BaTiO 3 The base dielectric ceramic and its preparation method are mainly used in the field of base metal multilayer ceramic capacitors. Background technique [0002] As the capacitor material with the fastest development and the largest consumption, MLCC has the characteristics of high specific capacity, small size, high precision and high insulation resistivity. In recent years, with the rapid development of the electronics industry, the demand for MLCC has increased, and large capacity, thin film, small size, and wide temperature have become its development trend, and the development of large capacity and thin film of MLCC has led to expensive internal electrode metals. The proportion of usage increases, and the overall production cost increases rapidly. In order to effectively reduce its production cost, it is necessary to use base metal electrodes such as Ni and Cu as internal electrode materials, and b...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3298C04B2235/3284C04B2235/3225C04B2235/6562C04B2235/6567
Inventor 郝华罗智平刘韩星陈程赖昕张东升曹明贺尧中华
Owner WUHAN UNIV OF TECH
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