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Novel CaTiO3-based linear energy-storage-medium ceramic material and preparation method thereof

A technology of energy storage medium and ceramic material, applied in the field of energy storage medium ceramics, can solve the problems of poor frequency stability, poor high temperature stability, limited wide application, etc., to achieve good frequency stability, moderate dielectric constant, acceptable good repeatability

Inactive Publication Date: 2016-09-21
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer and glass materials have high breakdown strength, but their low dielectric constant and poor high temperature stability limit their wide application
Ba is more common in energy storage medium ceramics x Sr 1-x TiO 3 system, but its breakdown strength is very low, and the dielectric loss at high temperature is relatively large
CaTiO 3 The base dielectric ceramic has the advantages of appropriately adjustable dielectric constant, low dielectric loss, and the dielectric constant does not change with the applied electric field. It can be used as an ideal candidate material for the pulse-forming line energy storage medium, but CaTiO 3 The high sintering temperature (1440°C) of dielectric ceramics limits its application in large-scale solid-state pulse forming lines to some extent
Moreover, its breakdown strength is low (200kV / cm), which cannot meet the requirements of the pulse forming line, but the increase of the breakdown strength will lead to a decrease in the dielectric constant. How to reduce the dielectric constant as much as possible? Improving the breakdown strength has become a research hotspot
In addition, CaTiO 3 The high temperature (>150°C) dielectric loss of dielectric ceramics is relatively large, and the frequency stability is not good
CaTiO 3 There are few reports on the study of base dielectric ceramics as energy storage medium for pulse forming lines

Method used

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  • Novel CaTiO3-based linear energy-storage-medium ceramic material and preparation method thereof
  • Novel CaTiO3-based linear energy-storage-medium ceramic material and preparation method thereof
  • Novel CaTiO3-based linear energy-storage-medium ceramic material and preparation method thereof

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Embodiment 1～4

[0030] CaCO with a purity greater than 99% 3 、TiO 2 , La 2 o 3 , ZnO and nano-Al with a purity greater than 99.9% 2 o 3 As raw material, according to the chemical formula Zn x Ca 0.97-x La 0.03 Ti0.97 Al 0.03 o 3 Carry out weighing batching, wherein x is respectively 0.01, 0.05, 0.1 and 0.2, uses absolute ethanol as solvent respectively, and zirconia ball is used as ball milling medium in ball milling tank for 24 hours; Bake at ℃ for 24 hours until the powder is dry, put it into an alumina crucible and pre-fire at 1050-1100℃ for 2 hours, pass through a 100-mesh sieve after the second ball milling and drying; then add 1.0wt% to 2.5wt% of binders for Granulate, dry press to form a green body with a diameter of 10mm and a thickness of about 1mm, raise the temperature at a rate of 1°C / min to 600°C for 2 hours, and remove the glue to obtain a green body; respectively put the green body in a muffle In the furnace, after 1280°C for 2h, 1280°C for 2h, 1280°C for 2h and 1250°...

Embodiment 2

[0031] The dielectric constant and dielectric loss of embodiments 2~5 vary with frequency at different temperatures as follows: Figure 2-5 As shown, the hysteresis loop is as Image 6 As shown, it can be seen from the figure that the system ceramics is a linear dielectric, and the XRD figure of embodiment 1 is shown in Figure 7 , the XRD figure of embodiment 2 is similar to embodiment 1, and the XRD figure of embodiment 3 is as follows Figure 8 Shown, the XRD figure of embodiment 4 is similar image 3 , such as 7 and Figure 8 It can be seen that: the present invention La 3+ / Al 3+ and Zn 2+ Doped with CaTiO 3 The lattice, the crystal structure is still orthorhombic, when the Zn doping amount is large, there will be a small amount of the second phase Zn 2 Ti 3 o 8 generate. See Table 1 for the variation range and breakdown strength of the dielectric properties at different temperatures and when the frequency is greater than 1kHz.

[0032] As can be seen from tabl...

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Abstract

The invention relates to a novel CaTiO3-based linear energy-storage-medium ceramic material and a preparation method thereof. The novel CaTiO3-based linear energy-storage-medium ceramic material is characterized in that the expression is ZnxCa(0.97-x)La0.03Ti0.97Al0.03O3, and x ranges from 0.01 to 0.2. The preparation method comprises steps as follows: CaCo3, TiO2, La2O3, Al2O3 and ZnO are taken as raw materials, weighed in the stoichiometric ratio according to the chemical formula ZnxCa0(0.97-x)La0.03Ti0.97Al0.03O3 with x ranging from 0.01 to 0.2, mixed, subjected to ball milling, dried, pre-sintered at the temperature of 1,000-1,150 DEG C and subjected to secondary ball milling, pre-sintered powder is obtained, the pre-sintered powder is sieved, mixed with an adhesive, granulated and formed, a ceramic body is obtained after dumping and sintered in air at the temperature of 1,200-1,300 DEG C, and the novel CaTiO3-based linear energy-storage-medium ceramic material is obtained. CaTiO3 ceramic is co-doped with Zn<2+> and La<3+> / Al<3+>, and the ZnxCa(0.97-x)La0.03Ti0.97Al0.03O3 linear energy-storage-medium ceramic material is obtained. The material has the characteristics of low dielectric loss, good frequency stability, moderate dielectric constant and relatively high breakdown strength.

Description

technical field [0001] The present invention relates to a kind of CaTiO 3 Ceramics are energy storage medium ceramics with low dielectric loss, good frequency stability, moderate dielectric constant and high breakdown strength under high working temperature. Background technique [0002] For the pulse power system, a high dielectric constant is an inevitable requirement for the development of pulse power towards miniaturization, compactness, and systematization; good withstand voltage performance is a necessary condition for improving the life and reliability of equipment; low dielectric constant Loss is an important guarantee for low energy loss and pulse waveform (especially for nanosecond narrow pulses) with a good falling edge; good frequency stability at high temperature is one of the important requirements for energy storage dielectric ceramics to work stably under extreme conditions one. [0003] At present, there are many studies on energy storage medium materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/468C04B35/622C04B2235/3208C04B2235/3217C04B2235/3227C04B2235/3284C04B2235/5454C04B2235/96
Inventor 曹明贺张亚萍刘韩星郝华尧中华
Owner WUHAN UNIV OF TECH
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