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Ceramic dielectric material and preparation method thereof

A technology for ceramic dielectric materials and raw materials is applied in the field of preparing the ceramic dielectric materials to achieve the effects of high dielectric constant, low dielectric loss and high breakdown electric field strength

Inactive Publication Date: 2012-10-31
中山市天键电子工业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Doping rare earth elements on fine-grained BaTiO 3 The impact of system withstand voltage and dielectric properties, Chinese Journal of Rare Earth, 2003, 21 (2)] disclosed the effect of rare earth oxide doping on fine-grained BaTiO 3 The influence of the withstand voltage and dielectric properties of the ceramics, although the breakdown electric field strength of the ceramics is obtained by doping Ho 3+ 、Er 3+ etc. increased to above 8KV / mm, but the tanδ is too large, which is 70×10 -4 ~180×10 -4

Method used

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  • Ceramic dielectric material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] To prepare the ceramic dielectric material of the present invention, take the following components by molar percentage:

[0032] BaCO 3 34.50% SrCO 3 14.79%

[0033] TiO 2 49.29% CeO 2 0.99%

[0034] Dy 2 o 3 0.29% MnO 2 0.14%.

[0035] BaCO 3 , SrCO 3 and TiO 2 Carry out batching, obtain batching thing, according to batching thing: zirconia ceramic ball: the mass ratio of deionized water=1:1:2 is put into ball mill pot and carry out ball milling 24h; Ball mill is placed in charging pan and puts in drying equipment , dried at a temperature of 120°C, the dried material was placed in an alumina crucible, put into an electric furnace and pre-synthesized at 1080°C for 2 hours to synthesize (Ba,Sr)TiO 3 . Add CeO to the above synthetic material 2 、Dy 2 o 3 and MnO 2 , to obtain the mixture, and then according to the mixture: zirconia ceramic balls: water = 1: 1: 1.5, carry out secondary ball milling for 24h; put the ball grinding m...

Embodiment 2

[0037] To prepare the ceramic dielectric material of the present invention, take the following components by molar percentage:

[0038] BaCO 3 12.50% SrCO 3 37.49%

[0039] TiO 2 48.12% CeO 2 0.99%

[0040] Dy 2 o3 0.89% MnO 2 0.01%.

[0041] BaCO 3 , SrCO 3 and TiO 2 Carry out batching, obtain batching, according to batching: zirconia ceramic ball: the mass ratio of deionized water=1:1:2 is put into ball mill tank and carries out ball milling 4h; Ball mill is placed in charging pan and puts in drying equipment , dried at a temperature of 110°C, the dried material was placed in an alumina crucible, put into an electric furnace and pre-synthesized at 1100°C for 4 hours to synthesize (Ba,Sr)TiO 3 . Add CeO to the above synthetic material 2 、Dy 2 o 3 and MnO 2 , to obtain the mixture, and then according to the mixture: zirconia ceramic balls: water = 1: 1: 1.5, carry out secondary ball milling for 6h; put the ball grinding material in the tray, and ...

Embodiment 3

[0043] To prepare the ceramic dielectric material of the present invention, take the following components by molar percentage:

[0044] BaCO 3 25.9% SrCO 3 25%

[0045] TiO 2 48% CeO 2 0.5%

[0046] Dy 2 o 3 0.5% MnO 2 0.1%.

[0047] BaCO 3 , SrCO 3 and TiO 2 Carry out batching, obtain batching, according to batching: zirconia ceramic ball: the mass ratio of deionized water=1:1:2 is put into ball mill tank and carries out ball milling 4h; Ball mill is placed in charging pan and puts in drying equipment , dried at a temperature of 130°C, the dried material was placed in an alumina crucible, put into an electric furnace and pre-synthesized at 1020°C for 3 hours to synthesize (Ba,Sr)TiO 3 . Add CeO to the above synthetic material 2 、Dy 2 o 3 and MnO 2 , to obtain the mixture, and then according to the mixture: zirconia ceramic balls: water = 1: 1: 1.5, carry out secondary ball milling for 12h; put the ball grinding material in the tray, and dry it ...

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Abstract

The invention discloses ceramic dielectric material which comprises the following compositions by molar percent: 12.50-34.50 % of BaCO3, 14.79-37.49% of SrCO3, 45.29-49.39% of TiO2, 0.01-0.99% of CeO2, 0.02-0.89% of Dy2O3 and 0.01-0.14% of MnO2. Aiming at overcoming the disadvantages in the prior art, the invention provides dielectric ceramic material which is high in dielectric constant and low in loss, and the invention further aims to provide a method for preparing the dielectric ceramic material. By adjusting the proportion of Ba and Sr in the basic formula of the dielectric ceramic material, the invention adjusts the Curie temperature of the ceramic material to be below room temperature, and the ceramic dielectric material has small grain size, high dielectric constant, low dielectric loss and high disruptive field intensity.

Description

technical field [0001] The invention relates to a ceramic dielectric material, and also relates to a preparation method for the ceramic dielectric material. Background technique [0002] For a long time, the research on medium and high voltage ceramic capacitors, especially the ceramic medium of lead-free capacitors, has been very active at home and abroad. The current research results show that there are still many problems in the capacitor ceramic dielectric, mainly due to the mutual constraints among parameters such as dielectric constant, loss, low temperature change rate of dielectric coefficient, and breakdown electric field strength. [0003] Such as [Huang Xinyou, Gao Chunhua, industrialized (Ba, Sr, Ca) (Ti, Zr) O 3 Research on base capacitor ceramics, Journal of Instrumentation, 2003, 24(1)], the room temperature dielectric constant of the capacitor ceramic medium is as high as 11535, and the tgδ is too large, which is 71×10 -4 ; [0004] [Zhang Qitu, Zhang Xiao...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/465C04B35/622
Inventor 曲远方冯砚儒江美新
Owner 中山市天键电子工业有限公司
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