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Sodium-bismuth-titanate-based transparent ceramic material and preparing method and application thereof

A technology of sodium bismuth titanate-based, transparent ceramics, applied in the field of lead-free piezoelectric ceramics, can solve the problems of difficulty in achieving anti-breakdown electric field, low anti-breakdown electric field, limiting energy storage density, etc., to promote the sintering mass transfer process, crystallization Good performance and high density

Active Publication Date: 2019-06-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrical conductivity of BNT-based ceramics is often high, resulting in a low breakdown electric field, which severely limits the further improvement of energy storage density.
BNT-based piezoelectric ceramics prepared by conventional solid-state sintering are difficult to achieve a breakthrough in the resistance to breakdown electric field

Method used

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  • Sodium-bismuth-titanate-based transparent ceramic material and preparing method and application thereof
  • Sodium-bismuth-titanate-based transparent ceramic material and preparing method and application thereof
  • Sodium-bismuth-titanate-based transparent ceramic material and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of BNT-BT-0.125BZN Fine Grain Transparent Ceramic Material

[0048] According to 0.825Bi 0.5 Na 0.5 TiO 3 -0.05BaTiO 3 -0.125Bi(Zn 2 / 3 Nb 1 / 3 )O 3 The molar stoichiometric ratio of the raw material Bi was weighed 2 o 3 , Na 2 CO 3 , BaCO 3 , ZnO, Nb 2 o 5 and TiO 2 Mix evenly, put the prepared material into a nylon tank with absolute ethanol as the medium and zirconia balls as the balls for ball milling, and ball mill for 8 hours at a speed of 250r / min. Then the ball-milled slurry was dried at 80°C. The dried powder was passed through a 200-mesh sieve, placed in an alumina crucible, and pre-fired at 800°C for 5 hours to obtain a pre-fired powder. Add 1wt.% B in calcined powder 2 o 3 -SiO 2 -ZnO glass sintering powder (average particle size 0.7 μm), then put it into a nylon jar with absolute ethanol as the medium and zirconia balls as the balls for ball milling, ball milling for 24 hours at a speed of 250r / min, and then Dry at 80°C. After ...

Embodiment 2

[0060] Other conditions are the same as in Example 1, except that the sintering temperature is 920°C. The density of the ceramic prepared at this sintering temperature is 92%, there are micropores in the ceramic, and its anti-breakdown electric field is 12kV / mm.

Embodiment 3

[0062] Other conditions are the same as in Example 1, except that the sintering temperature is 980°C. At this sintering temperature, the density of the ceramic is 90%, there are micropores in the ceramic, and its anti-breakdown electric field is 10kV / mm.

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Abstract

The invention discloses a sodium-bismuth-titanate-based transparent ceramic material and a preparing method. The chemical general formula of the sodium-bismuth-titanate-based transparent ceramic material is (0.95-x)Bi0.5Na0.5TiO3-0.05BaTiO3-xBi(Zn2 / 3Nb1 / 3)O3, wherein x is equal to 0.05 to 0.15 (abbreviated as (0.95-x)BNT-BT-xBZN). A traditional solid phase method is adopted, and through primary presintering and primary sintering, the sodium-bismuth-titanate-based transparent ceramic material is prepared; a sintering additive is added, a sintering technology is adjusted, a transparent fine crystal ceramic is successfully prepared at the low sintering temperature, and the average crystallite size is about 400 nm. A ceramic chip prepared with the method shows the high dielectric relaxation performance, a long-and-thin ferroelectric hysteresis loop and a high-impact breakdown electric field, and is an excellent dielectric energy-storage ceramic material. The highest discharge energy density 2.83 J / cm<3> is obtained under an 18kV / mm external electric field, and at this moment, the energy storage density is 4.23 J / cm<3>, and the energy storage efficiency is 67%. In addition, the cyclingstability of the energy storage performance is also quite excellent, and through 105 times of loop tests, loss of the discharge energy density is lower than 2%.

Description

technical field [0001] The invention relates to a bismuth sodium titanate-based transparent ceramic material and a preparation method and application thereof, belonging to the technical field of lead-free piezoelectric ceramics. Background technique [0002] Dielectric ceramics have always been excellent candidates for the preparation of pulse power dielectric energy storage capacitors due to their good temperature stability and long cycle life. Ceramic energy storage capacitors can realize instantaneous high-current and high-voltage discharges. They are important electronic components and play an irreplaceable role in renewable power energy equipment and other fields. However, ceramic energy storage capacitors are currently limited by their low energy storage density, which is far from meeting people's requirements for miniaturization and integration of energy storage devices. In recent years, research on ceramic energy storage capacitors has received widespread attention,...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B41/88
Inventor 张斗周学凡祁核罗行
Owner CENT SOUTH UNIV
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