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Method for preparing high-performance ceramic capacitor material by preparing multi-variant synergetic doped barium strontium titanate

A technology for ceramic capacitors and barium strontium titanate is applied in the field of multi-component synergistic doping of barium strontium titanate to prepare high-performance ceramic capacitor materials, which can solve the problems of low dielectric loss, large loss, and large change in dielectric constant, and achieve high dielectric constant. Low-loss withstand voltage characteristics, cost savings, and effects of high withstand voltage characteristics

Active Publication Date: 2016-07-20
江苏省陶瓷研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SrTiO3 ceramics have the advantages of small dielectric constant change with voltage, low dielectric loss and high dielectric strength; but the dielectric constant is only about 250 at room temperature
BaTiO 3 The Curie temperature is about 120°C, and the dielectric constant at the Curie point can reach 105. It also has a large dielectric constant at room temperature, but its loss is large, and the dielectric constant varies greatly with voltage.
Therefore pure SrTiO 3 and BaTiO 3 It cannot meet the requirements of ceramic dielectric materials for medium and high voltage capacitors

Method used

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  • Method for preparing high-performance ceramic capacitor material by preparing multi-variant synergetic doped barium strontium titanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] with BaCO 3 , CaCO 3 、 Bi 2 o 3 ,, ZrO 2 、TiO 2 As the main raw material, base materials such as strontium titanate and barium titanate are pre-synthesized.

[0023] (1) With 1molBi 2 o 3 , 3molTiO 2 For the standard ratio, wet ball milling to make it evenly mixed, and after press filtration, keep it at 800°C for 2 hours to obtain Bi 2 o 3 ·3TiO2 2 ; Analytical pure BaCO 3 , SrCO 3 respectively and TiO 2 Mix evenly according to the ratio of 1:1 of the amount of substances, wet ball milling to make it evenly mixed, and prepare BaTiO by 1180°C for 2.5h after pressing and other processes 3 and SrTiO 3 ; Analytical pure CaCO 3 with ZrO 2 Mix evenly according to the amount of the same substance, and cool in an electric furnace at 1250 ° C for 2 hours to obtain CaZrO 3 .

[0024] (2) Then prepare BST ceramic materials according to production design requirements, (1-z) [(Ba 1-x-y Sr x Ca y ) Ti 1-y Zr y o 3 ]·z(Bi 2 o 3 ·3TiO2 2 ), where x=0.35, y=0....

Embodiment 2

[0032] with BaCO 3 , CaCO 3 、 Bi 2 o 3 ,, ZrO 2 、TiO 2 As the main raw material, base materials such as strontium titanate and barium titanate are pre-synthesized.

[0033] (1) With 1molBi 2 o 3 , 3molTiO 2 It is the standard ratio, wet ball milling to make it evenly mixed, and after pressure filtration, keep it at 850°C for 2~3h to get Bi 2 o 3 ·3TiO2 2 ; Analytical pure BaCO 3 , SrCO 3 respectively and TiO 2 Mix evenly according to the ratio of 1:1 of the amount of substances, wet ball milling to make it evenly mixed, and prepare BaTiO by 1200°C for 2h after pressing and other processes 3 and SrTiO 3 ; Analytical pure CaCO 3 with ZrO 2 Mix evenly according to the amount of the same substance, and cool in an electric furnace at 1250 ° C for 2 hours to obtain CaZrO 3 .

[0034] (2) Then prepare BST ceramic materials according to production design requirements, (1-z) [(Ba 1-x-y Sr x Ca y ) Ti 1-y Zr y o 3 ]·z(Bi 2 o 3 ·3TiO2 2 ), where x=0.35, y=0.1, ...

Embodiment 3

[0042] with BaCO 3 , CaCO 3 、 Bi 2 o 3 ,, ZrO 2 、TiO 2 As the main raw material, base materials such as strontium titanate and barium titanate are pre-synthesized.

[0043] (1) With 1molBi 2 o 3 , 3molTiO 2 It is the standard ratio, wet ball milling to make it evenly mixed, and after pressure filtration, it is kept at 850°C for 2 hours to obtain Bi 2 o 3 ·3TiO2 2 ; Analytical pure BaCO 3 , SrCO 3 respectively and TiO 2 Mix evenly according to the ratio of 1:1 of the amount of substances, wet ball milling to make it evenly mixed, and prepare BaTiO by 1200°C for 2h after pressing and other processes 3 and SrTiO 3 ; Analytical pure CaCO 3 with ZrO 2 Mix evenly according to the amount of the same substance, and cool in an electric furnace at 1250 ° C for 2 hours to obtain CaZrO 3 .

[0044] (2) Then prepare BST ceramic materials according to production design requirements, (1-z) [(Ba 1-x-y Sr x Ca y ) Ti 1-y Zr y o 3 ]·z(Bi 2 o 3 ·3TiO2 2 ), where x=0.3,...

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Abstract

The invention relates to a method for preparing a high-performance ceramic capacitor material by preparing multi-variant synergetic doped barium strontium titanate. Dielectric properties of a BST ceramic material in a room temperature range are realized by utilizing strontium titanate, barium titanate and zirconium titanate; the performance of a product is improved by adopting multi-variant doping and synergetic compensation. Results show that the material has the characteristics of high dielectricity, low loss and voltage resistance; moreover, the product is easy to design, and cost is saved.

Description

technical field [0001] The invention belongs to the field of high-voltage ceramic capacitors, in particular to a high-performance ceramic capacitor material prepared by multi-component synergistic doping of barium strontium titanate. Background technique [0002] Barium strontium titanate (Ba 1-x Sr x TiO 3 , referred to as BST)-based ceramic material is a ferroelectric material with high insulation resistance and low dielectric loss. By changing the material composition and trace doping modification, the material can be adjusted to a suitable range of dielectric constant and Curie temperature. , and at the same time ensure that the material has very good and stable dielectric temperature characteristics to a certain extent. With the rapid development of modern mobile communications, LED, and aerospace fields, electronic components are increasingly miniaturized and integrated, and there is an urgent need for high-performance ceramic capacitors with high voltage resistance...

Claims

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Application Information

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IPC IPC(8): C04B35/49C04B35/622H01G4/12
CPCC04B35/4682C04B35/49C04B35/622C04B2235/3208C04B2235/3213C04B2235/3225C04B2235/3229C04B2235/3251C04B2235/3284C04B2235/3298H01G4/1245
Inventor 詹丽君洑义达左真国陆婵娟
Owner 江苏省陶瓷研究所有限公司
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