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Bismuth barium sodium niobate-based glass ceramic material with high energy storage density, and preparation method and application thereof

A bismuth barium sodium niobate-based technology with high energy storage density is applied in glass manufacturing equipment, glass forming, manufacturing tools, etc. high energy density

Active Publication Date: 2019-11-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the data is simple, the glass-ceramic material prepared by this patent contains more KNbO 3 and KNb 3 o 8 Phase, the material is easy to deliquescence due to moisture absorption; at the same time, its dielectric constant is lower than 70 at room temperature and 100kHz test conditions, which is not conducive to the improvement of capacitor capacitance

Method used

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  • Bismuth barium sodium niobate-based glass ceramic material with high energy storage density, and preparation method and application thereof
  • Bismuth barium sodium niobate-based glass ceramic material with high energy storage density, and preparation method and application thereof
  • Bismuth barium sodium niobate-based glass ceramic material with high energy storage density, and preparation method and application thereof

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preparation example Construction

[0035] The preparation method of bismuth barium sodium niobate base glass-ceramic material with high energy storage density adopts the following steps:

[0036] (1) with BaCO 3 、 Bi 2 o 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 As raw material, the molar ratio is 21.6BaCO 3 -2.4Bi 2 o 3 -6Na 2 CO 3 -30Nb 2 o 5 -40SiO 2 After the ingredients are mixed evenly, the temperature is controlled at 1450-1550°C and melted at a high temperature for 1-2 hours to obtain a high-temperature melted slurry;

[0037] (2) Pour the high-temperature melt prepared in step (1) into a mold preheated at 600-650°C to form and maintain the preheating temperature for 5-6 hours to remove the residual stress in the glass to prepare a transparent uniform glass, and slice it to obtain glass flakes;

[0038] (3) Perform controlled crystallization on the glass flakes prepared in step (3). During the controlled crystallization, the heating rate is controlled to be 3°C / min, the crystallization temperature...

Embodiment 1

[0041] The preparation method of bismuth barium sodium niobate base glass-ceramic material with high energy storage density adopts the following steps:

[0042] (1) BaCO with a purity greater than 99wt% 3 、 Bi 2 o 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 For raw material batching, the molar percentage of each component is 21.6%, 2.4%, 6%, 30%, 40%, mixed by ball mill for 24 hours, dried at 100°C for 6 hours, and melted at 1550°C for 2 hours; (The above-mentioned ball mills all use absolute ethanol as the medium, and the ball-to-material ratio is 1.5:1).

[0043] (2) Pouring the high-temperature melt obtained in step (1) into a square metal mold, annealing for stress relief at 650° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0044] (3) Put an equal amount of the glass flakes prepared in step (2) into a crucible, heat up to 850° C. at a rate of 3° C. / min, and keep warm for 3 hours to obtain glass ceramics.

[0045] The dielectric ...

Embodiment 2

[0048] The preparation method of bismuth barium sodium niobate base glass-ceramic material with high energy storage density adopts the following steps:

[0049] (1) BaCO with a purity greater than 99wt% 3 、 Bi 2 o 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 For raw material batching, the molar percentage of each component is 21.6%, 2.4%, 6%, 30%, 40%, mixed by ball mill for 24 hours, dried at 100°C for 6 hours, and melted at 1550°C for 2 hours; (The above-mentioned ball mills all use absolute ethanol as the medium, and the ball-to-material ratio is 1.5:1).

[0050] (2) Pouring the high-temperature melt obtained in step (1) into a square metal mold, annealing for stress relief at 650° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0051] (3) Put an equal number of glass flakes prepared in step (2) into a crucible, heat up to 900° C. at a rate of 3° C. / min, and keep warm for 3 hours to obtain glass ceramics.

[0052] The dielectric proper...

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Abstract

The invention relates to a bismuth barium sodium niobate-based glass ceramic material with high energy storage density, and a preparation method and application thereof. The chemical components of theglass ceramic material accord with a chemical general formula of 21.6BaCO3-2.4Bi2O3-6Na2CO3-30Nb2O5-40SiO2. The preparation method comprises the following steps: taking BaCO3, Bi2O3, Na2CO3, Nb2O5 and SiO2 as raw materials to carry out uniform mixing, then carrying out drying, carrying out melting at a high temperature to obtain a glass melt; quickly pouring the high-temperature melt into a preheated mould, removing residual stress in the glass body through annealing treatment, and then cutting the glass block body into glass sheets with a same size and thickness; and carrying out controlledcrystallization on the glass sheets to obtain the glass ceramic energy storage material. Compared with the prior art, the glass ceramic energy storage material prepared by the method has the advantages of high dielectric constant (up to 118), high breakdown field strength (up to 1878.75 kV / cm), high energy storage density (up to 18.4 J / cm<3>), low loss (low to 0.025), good temperature stability and the like.

Description

technical field [0001] The invention belongs to the field of dielectric energy storage materials, and in particular relates to a bismuth barium barium sodium niobate-based glass ceramic material with high energy storage density and a preparation method and application thereof. Background technique [0002] With the development of social industry, the demand for energy continues to increase. Facing the energy crisis, the problems of improving the efficiency of traditional energy utilization and developing new energy have become increasingly prominent. In order to meet the application needs of the energy field, energy storage devices are developing towards miniaturization and light weight. In order to reduce the volume of the device, it is necessary to increase the energy storage density per unit volume of the device. For this reason, the development and application of high energy storage density dielectrics have attracted much attention. In order to meet the requirements of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02C03C6/04C03B19/02C03B32/02H01G4/12
CPCC03C10/00C03C1/00C03B19/02C03B32/02H01G4/129
Inventor 沈波陈开开江涛翟继卫
Owner TONGJI UNIV
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