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X7R ceramic capacitor dielectric material and preparation method thereof

A technology of ceramic capacitors and dielectric materials, applied in the direction of fixed capacitor dielectrics, capacitors, fixed capacitors, etc., can solve the problems of narrow use environment temperature range, market requirements that do not meet high quality requirements, low reliability, etc. The effect of wide range, superior performance and high reliability

Active Publication Date: 2018-06-08
厦门三行电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Invention patent CN104193328B discloses a ceramic dielectric material, the main phase is barium titanate, and the auxiliary material is SrTiO 3 , including modified additives and sintering fluxes, whose temperature characteristic change rate is about 20% at -25 to +85°C, and its operating environment temperature range is narrow, and its reliability is low, which does not meet the market requirements for high quality requirements

Method used

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  • X7R ceramic capacitor dielectric material and preparation method thereof
  • X7R ceramic capacitor dielectric material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The preparation method of X7R ceramic capacitor dielectric material is as follows:

[0026] 1) According to the structural formula BaSr 0.5 Ca 0.5 Ti 2 o 6 The stoichiometric ratio of BaCO 3 , SrCO 3 , CaCO 3 、TiO 2 As a raw material, put the weighed raw material into a ball mill jar, add deionized water (accounting for 50% of the total weight) and zirconia balls to grind for 10 hours, dry and pulverize the material, and then calcined at 1290°C for 3 hours to obtain CaB 0.5 Ca 0.5 Ti 2 o 6 ;

[0027] 2) BaSr obtained in the previous step 0.5 Ca 0.5 Ti 2 o 6 As the main component, reweigh the modified dopant according to Table 1, put the weighed materials into a ball mill jar, add deionized water (accounting for 50% of the total weight) and zirconia balls to grind into a slurry Then add it to an ultrafine sand mill for grinding, then add a total weight of 5% polyvinyl alcohol aqueous solution (mass concentration 10%) to dry and granulate to obtain the X7R...

Embodiment 2

[0034] The preparation method of X7R ceramic capacitor dielectric material is as follows:

[0035] 1) According to the structural formula BaSr 0.5 Ca 0.5 Ti 2 o 6 The stoichiometric ratio of BaCO 3 , SrCO 3 , CaCO 3 、TiO 2 As a raw material, put the weighed raw material into a ball mill jar, add deionized water (accounting for 50% of the total weight) and zirconia balls to grind for 10 hours, dry and pulverize the material, and then calcined at 1300°C for 3 hours CaB 0.5 Ca 0.5 Ti 2 o 6 ;

[0036] 2) BaSr obtained in the previous step 0.5 Ca 0.5 Ti 2 o 8 As the main component, reweigh the modified dopant according to Table 1, put the weighed materials into a ball mill jar, add deionized water (accounting for 50% of the total weight) and zirconia balls to grind into a slurry Then add it to an ultrafine sand mill for grinding, then add a 10% total weight polyvinyl alcohol aqueous solution (mass concentration 10%) to dry and granulate to obtain the X7R ceramic cap...

Embodiment 3

[0039] The preparation method of X7R ceramic capacitor dielectric material is as follows:

[0040] 1) According to the structural formula BaSr 0.5 Ca 0.5 Ti 2 o 6 The stoichiometric ratio of BaCO 3 , SrCO 3 , CaCO 3 、TiO 2 As a raw material, put the weighed raw material into a ball mill jar, add deionized water (accounting for 50% of the total weight) and zirconia balls to grind for 12 hours. CaB 0.5 Ca 0.5 Ti 2 o 6 ;

[0041] 2) BaSr obtained in the previous step 0.5 Ca 0.5 Ti 2 o 6 As the main component, reweigh the modified dopant according to Table 1, put the weighed materials into a ball mill jar, add deionized water (accounting for 50% of the total weight) and zirconia balls to grind into a slurry Then add it to an ultrafine sand mill for grinding, then add a 10% total weight polyvinyl alcohol aqueous solution (mass concentration 10%) to dry and granulate to obtain the X7R ceramic capacitor dielectric material.

[0042] After the obtained X7R ceramic cap...

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Abstract

The invention relates to an X7R ceramic capacitor dielectric material and a preparation method of the dielectric material. The dielectric material comprises the following major ingredients: BaSrxCa1 xTi2O6, and modified dopant, wherein x is greater than or equal to 0.35 and less than or equal to 0.85; and the modified dopant two or more of nanoscale or sub-nanoscale ZnO, SiO2, Al2O3, Dy2O3, Nb2O5,Ta2O3, Li2CO3, TiO2 and MnCO3. A firing temperature of the X7R ceramic capacitor dielectric material is 1050-1150 DEG C; a dielectric constant is 800-1200; a dielectric loss is less than or equal to0.5%; dielectric strength is greater than or equal to 9KVAc / mm; a temperature characteristic change rate (from -55 DEG C to 125 DEG C) is less than or equal to plus-minus 15%; and the dielectric material is applicable to manufacturing of a high-reliability X7R ceramic capacitor.

Description

technical field [0001] The invention relates to the technical field of electronic materials and devices, in particular to an X7R ceramic capacitor dielectric material and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of the electronics industry, the quality requirements for ceramic capacitors in the current market (especially mobile phone chargers, etc.) are getting higher and higher, which requires both miniaturization and high reliability. R & D and production of high reliability And the key technical problem to be solved for miniaturized ceramic capacitors is to develop high-performance dielectric materials for ceramic capacitors, but the current domestic corresponding materials are gradually difficult to meet the development requirements. Therefore, it is one of the key points for the sustainable development of the domestic electronics industry to develop and industrialize the preparation technology of cerami...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C04B41/88H01G4/12
CPCC04B35/468C04B35/622C04B41/5116C04B41/88C04B2235/3203C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3251C04B2235/3262C04B2235/3284C04B2235/3418C04B2235/6567C04B2235/661C04B2235/96H01G4/1209H01G4/1227C04B41/4539C04B41/0072
Inventor 钟永全黄景林
Owner 厦门三行电子有限公司
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