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A ta with low dielectric loss 2 o 5 Doped niobate-based glass-ceramic material and its preparation method and application

A glass ceramic and niobate technology, applied in glass manufacturing equipment, glass molding, hybrid/electric double layer capacitor manufacturing, etc., can solve the problem of high dielectric loss of energy storage materials, unfavorable capacitor capacitance, and low energy storage density and other problems, to achieve the effect of improving the dielectric constant, uniform and dense microscopic morphology, and simple preparation method

Active Publication Date: 2021-12-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method of this information is simple, the dielectric constant of the glass ceramics prepared by this patent is lower than 70 under the test conditions of 25°C and 100kHz, and the dielectric loss is also higher than 0.01, which is not conducive to the improvement of capacitor capacitance.
Although the preparation method of the above-mentioned patent is simple, the dielectric loss of the prepared energy storage material is relatively high, and the energy storage density is relatively low.

Method used

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  • A ta with low dielectric loss <sub>2</sub> o <sub>5</sub> Doped niobate-based glass-ceramic material and its preparation method and application
  • A ta with low dielectric loss <sub>2</sub> o <sub>5</sub> Doped niobate-based glass-ceramic material and its preparation method and application
  • A ta with low dielectric loss <sub>2</sub> o <sub>5</sub> Doped niobate-based glass-ceramic material and its preparation method and application

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preparation example Construction

[0033] The above-mentioned Ta with low dielectric loss 2 o 5 A method for preparing a doped niobate-based glass-ceramic material, comprising the following steps:

[0034] 1) with SrCO 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 、 Ta 2 o 5 As raw material, according to 6.4Na 2 CO 3 -25.6SrCO 3 -32[(1-x)Nb 2 o 5 ,xTa 2 o 5 ]-36SiO 2 The molar ratio in the formula is prepared and mixed evenly, and then melted at a high temperature of 1450-1550 ° C for 1-2 hours to obtain a high-temperature molten slurry;

[0035] 2) Pour the high-temperature molten slurry prepared in step 1) into a preheated mold at 600-650°C for molding, and after removing residual stress at a constant temperature for 5-6 hours, slice it to obtain glass flakes;

[0036] 3) Heating the glass flakes prepared in step 2) to 750-850°C at a heating rate of 1-5°C / min, and performing controlled crystallization for 3-5 hours to obtain Ta 2 o 5 Doped niobate-based glass-ceramic materials.

[0037] The following ar...

Embodiment 1

[0039] A low dielectric loss Ta 2 o 5 Doped niobate-based glass-ceramic material, the preparation method of which comprises the following steps:

[0040] 1) SrCO with a purity greater than 99wt% 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 、 Ta 2 o 5 As raw material, according to chemical formula 6.4Na 2 CO 3 -25.6SrCO 3 -32[(1-x)Nb 2 o 5 ,xTa 2 o 5 ]-36SiO 2 (x represents the molar ratio, x=0, 1%, 2%, 5%, 10%) is weighed in molar ratio, after ball milling and mixing for 24h (with absolute ethanol as the ball milling medium, the ball-to-material ratio is 1.5: 1) Dry at 100°C for 6 hours, and then melt at 1550°C for 2 hours to obtain a high-temperature melt;

[0041] 2) Pouring the high-temperature melt into a square metal mold, and annealing under stress at 650°C for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0-1.5mm;

[0042] 3) Put an equal number of glass flakes into a crucible, heat to 750°C at a heating rate of 3°C / min and keep it warm for 5...

Embodiment 2

[0045] A low dielectric loss Ta 2 o 5 Doped niobate-based glass-ceramic material, the preparation method of which comprises the following steps:

[0046] 1) SrCO with a purity greater than 99wt% 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 、 Ta 2 o 5 As raw material, according to chemical formula 6.4Na 2 CO 3 -25.6SrCO 3 -32[(1-x)Nb 2 o 5 ,xTa 2 o 5 ]-36SiO 2 (x represents the molar ratio, x=0, 1%, 2%, 5%, 10%) is weighed in molar ratio, after ball milling and mixing for 24h (with absolute ethanol as the ball milling medium, the ball-to-material ratio is 1.5: 1) Dry at 100°C for 6 hours, and then melt at 1550°C for 2 hours to obtain a high-temperature melt;

[0047] 2) Pouring the high-temperature melt into a square metal mold, and annealing under stress at 650°C for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0-1.5mm;

[0048] 3) Put an equal number of glass flakes into a crucible, heat to 800°C at a heating rate of 3°C / min and keep it warm for...

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Abstract

The present invention relates to a Ta with low dielectric loss 2 o 5 Doped niobate-based glass-ceramic material and its preparation method and application, the preparation method includes firstly using SrCO 3 、Na 2 CO 3 , Nb 2 o 5 , SiO 2 、 Ta 2 o 5 As raw material, according to 6.4Na 2 CO 3 ‑25.6SrCO 3 ‑32[(1‑x)Nb 2 o 5 ,xTa 2 o 5 ]‑36SiO 2 The molar ratio is mixed, and the high-temperature molten slurry is obtained after high-temperature melting; then the high-temperature molten slurry is poured into the mold for molding, and after the residual stress is removed at a constant temperature, the glass flakes are obtained by slicing; finally, the glass flakes are subjected to Crystallization is controlled to obtain the above-mentioned niobate-based glass-ceramic material. Compared with the prior art, the preparation method of the present invention is simple, economical and practical, and the prepared glass-ceramic composite material has high dielectric constant (86), high breakdown strength (1984.75kV / cm), low dielectric loss (0.004 ) and high theoretical energy storage density (15.01J / cm 3 ), which has good application potential in the field of energy storage capacitor materials.

Description

technical field [0001] The invention belongs to the technical field of dielectric energy storage materials, and relates to a Ta with low dielectric loss 2 o 5 Doped niobate-based glass-ceramic material and its preparation method and application. Background technique [0002] With the continuous development of my country's military industry and the steady advancement of national defense modernization, the power supply systems of some advanced high-end weapons (such as laser weapons, electromagnetic guns and high-power radars, etc.) all rely on pulse power technology. In addition, the excessive consumption of global traditional fossil energy, the sharp reduction of reserves, and the increasingly prominent problems of energy and the environment. Improving the efficiency of traditional energy utilization and developing new environmentally friendly and renewable energy has become a worldwide problem that needs to be solved urgently. In order to meet the application requirements...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03C6/04C03B19/02C03B32/02H01G11/52H01G11/84
CPCC03C10/00C03C1/00C03B19/02C03B32/02H01G11/52H01G11/84
Inventor 翟继卫谢书峰沈波
Owner TONGJI UNIV
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