Unleaded ceramic with high voltage and high energy density simultaneously and preparation method for unleaded ceramic

A technology with high energy storage density and high voltage, applied in the field of lead-free piezoelectric and high energy storage density ceramic materials and their preparation, to achieve the effects of fine and uniform grains, high energy storage density, and low sintering temperature

Inactive Publication Date: 2015-06-17
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there have been no reports on lead-free ceramic materials with high voltage electrical properties and high energy storage density and their preparation methods.

Method used

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  • Unleaded ceramic with high voltage and high energy density simultaneously and preparation method for unleaded ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation ingredients are: (0.95- x - y - z ) Bi 0.5 Na 0.5 TiO 3 – x Bi 0.5 K 0.5 TiO 3 – y Ba 0.65 Sr 0.35 Ti - o 3 – z K 0.5 Na 0.5 NbO 3 –0.05 LiTaO 3 ,in x =0.05, y =0.02, z =0.02 for ceramic materials.

[0023] The preparation method comprises the following steps:

[0024] Electronic grade powder: Bi 2 o 3 、Na 2 CO 3 、K 2 CO 3 , Li 2 CO 3 、BaCO 3 , SrCO 3 , Nb 2 o 5 、 Ta 2 o 5 and TiO 2 as raw materials, respectively according to the following chemical formula:

[0025] (0.95- x - y - z ) Bi 0.5 Na 0.5 TiO 3 – x Bi 0.5 K 0.5 TiO 3 – y Ba 0.65 Sr 0.35 Ti - o 3 – z K 0.5 Na 0.5 NbO 3 –0.05 LiTaO 3 For batching, use absolute ethanol as the medium for ball milling and wet grinding for 12 hours, dry at 80°C, and pre-synthesize the main crystal phase powder in an alumina crucible at 850°C for 2 hours.

[0026] The synthesized main crystal phase powder was high-energy ball milled with absolute ethanol as ...

Embodiment 2

[0031] The preparation ingredients are:

[0032] (0.95- x - y - z ) Bi 0.5 Na 0.5 TiO 3 – x Bi 0.5 K 0.5 TiO 3 – y Ba 0.65 Sr 0.35 Ti - o 3 – z K 0.5 Na 0.5 NbO 3–0.05 LiTaO 3 ,in x =0.15, y =0.06, z =0.1 for ceramic materials.

[0033] The preparation method is the same as in Example 1, except that the sintering temperature is 750°C.

[0034] The performance is shown in Table 1.

Embodiment 3

[0036] The preparation ingredients are:

[0037] (0.95- x - y - z ) Bi 0.5 Na 0.5 TiO 3 – x Bi 0.5 K 0.5 TiO 3 – y Ba 0.65 Sr 0.35 Ti - o 3 – z K 0.5 Na 0.5 NbO 3 –0.05 LiTaO 3 ,in x =0.25, y =0.002, z =0.08 for ceramic materials.

[0038] The preparation method is the same as in Example 1, except that the sintering temperature is 800°C.

[0039] The performance is shown in Table 1.

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Abstract

The invention discloses a high-voltage high-energy density unleaded ceramic dielectric material. The components of the material are expressed through the general formula (0.95-x-y-z)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3-yBa0.65Sr0.35TiO3-zK0.5Na0.5NbO3-0.05LiTaO3, wherein x, y, z represent mole fractions; x is larger than or equal to 0.002 and smaller than or equal to 0.3; y is larger than or equal to 0.002 and smaller than or equal to 0.2; z is larger than or equal to 0.001 and smaller than or equal to 0.3. The material is sintered by adopting electric discharge plasma; uniform dense ceramic texture can be obtained at a low sintering temperature; the ceramic has excellent energy storage density, energy storage efficiency and high voltage electricity constant; the energy storage density can reach 1.75 J/cm<3>; the energy storage efficiency can reach 65%; the piezoelectric constant d33 can reach 682 pm/V; the practicability is good.

Description

technical field [0001] The invention relates to a piezoelectric and dielectric energy storage ceramic material, in particular to a lead-free piezoelectric and high energy storage density ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are important functional materials that realize the mutual conversion of mechanical energy and electrical energy, and are widely used in high-tech fields such as information, laser, navigation, electronic technology, communication, measurement and detection, precision machining and sensing technology. However, most of the practical piezoelectric ceramics are lead zirconate titanate (PZT) or materials based on lead zirconate titanate. Because lead-containing piezoelectric ceramics will pollute the environment during the process of preparation, use and disposal. Therefore, finding a lead-free piezoelectric ceramic material that can replace lead-based piezoelectric ceramics is a subject of g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/64
Inventor 周昌荣许积文袁昌来黎清宁曾卫东陈国华
Owner GUILIN UNIV OF ELECTRONIC TECH
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