Piezoelectric ceramic material with high voltage electric response and high Curie temperature and preparation method thereof

A piezoelectric ceramic and high voltage technology, which is applied in the field of lead-free textured piezoelectric ceramic materials and its preparation, can solve the problems of inability to obtain high positive piezoelectric effect and high Curie temperature, etc., to ensure optimal selection Effects of orientation, high Curie temperature, and high piezoelectric response

Active Publication Date: 2019-04-16
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent mainly emphasizes the small hysteresis characteristics of ceramics. The preparation method used is the traditional solid-state sintering process, which cannot obtain materials with high positive piezoelectric effect and high Curie temperature.

Method used

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  • Piezoelectric ceramic material with high voltage electric response and high Curie temperature and preparation method thereof
  • Piezoelectric ceramic material with high voltage electric response and high Curie temperature and preparation method thereof

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preparation example Construction

[0035] The preparation method of the piezoelectric ceramic material with high piezoelectric response and high Curie temperature adopts the following steps:

[0036] (1) Preparation of powder base material: with K 2 CO 3 , Na 2 CO 3 ,Nb 2 o 5 ,Sb 2 o 3 ,ZrO 2 , Bi 2 o 3 As the raw material, after drying the raw material, weigh it according to the above stoichiometric ratio, ball mill the raw material and mix it evenly, then pre-calcine at 850-900°C for 3-6h, then carry out secondary ball milling, drying, and sieving to obtain the powder Binder;

[0037] (2) NaNbO was prepared by two-step molten salt method 3 sheet template, using the following steps:

[0038] (2-1) Precursor Bi prepared by molten salt method 2.5 Na 3.5 Nb 5 o 18 : (6-7): (6-7): (9-10) mixed raw material Bi according to the mol ratio 2 o 3 、Na 2 CO 3 , and TiO 2 , then add NaCl as a molten salt, the quality of NaCl is 1.1-1.5 times the total mass of the above three raw materials, ball mill t...

Embodiment 1

[0048] 1. 0.97 (K 0.48 Na 0.52 )(Nb 0.97 Sb 0.03 )O 3 -0.03Bi 0.5 (Na 0.8 K 0.2 ) 0.5 ZrO 3 Preparation of powder base material: weigh 5.1580g NaCO 3 , 6.5420g KCO 3 , 24.2175g Nb 2 o 5 , 0.8492g Sb 2 o 3 , 0.7468g ZrO 2 , 0.6992g Bi 2 o 3 As the raw material, put the raw material into a nylon tank, add absolute ethanol and zirconium balls, and mill for 24 hours; dry the evenly mixed raw material at 100°C, and then pre-fire it at 850°C for 5 hours; put the pre-fired powder in the grinder After grinding in a bowl, carry out secondary ball milling, and the ball milling time is 48 hours; after drying the slurry after the secondary ball milling at 100°C, grind it with a mortar and pass through a 200-mesh sieve to obtain a base material with uniform particle size. material.

[0049] 2. Weigh 10g of pre-synthesized 0.97(K 0.48 Na 0.52 )(Nb 0.97 Sb 0.03 )O 3 -0.03Bi 0.5 (Na 0.8 K 0.2 ) 0.5 ZrO 3 Base material, 0.2810g NaNbO 3 Template, 0.05g MnO 2 For po...

Embodiment 2

[0055] 1. 0.97 (K 0.48 Na 0.52 )(Nb 0.96 Sb 0.04 )O 3 -0.03Bi 0.5 (Na 0.8 K 0.2 ) 0.5 ZrO 3 Preparation of powder base material: weigh 5.1580g NaCO 3 , 6.5420g KCO 3 , 23.9596g Nb 2 o 5 , 1.1322g Sb 2 o 3 , 0.7468g ZrO 2 , 0.6992g Bi 2 o 3 As the raw material, put the raw material into a nylon tank, add absolute ethanol and zirconium balls, and mill for 24 hours; dry the evenly mixed raw material at 100°C, and then pre-fire it at 850°C for 5 hours; put the pre-fired powder in the grinder After grinding in a bowl, perform secondary ball milling for 48 hours; dry the slurry after secondary ball milling at 100°C, grind it with a mortar and pass through a 200-mesh sieve to obtain a base material with uniform particle size .

[0056] 2. Weigh 10g of pre-synthesized 0.97(K 0.48 Na 0.52 )(Nb 0.96 Sb 0.04 )O 3 -0.03Bi 0.5 (Na 0.8 K 0.2 ) 0.5 ZrO 3 Base material, 0.2805g NaNbO 3 Template, 0.05g MnO 2 For powder, weigh toluene and absolute ethanol with a ma...

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Abstract

The invention relates to a piezoelectric ceramic material with high voltage electric response and a high Curie temperature and a preparation method thereof. A stoichiometric ratio accords with a chemical general formula (1-x)(K0.48Na0.52)(Nb1-ySby)O3-xBi0.5(Na0.8K0.2)0.5ZrO3; wherein x is more than or equal to 0.02 and less than or equal to 0.04, and y is more than or equal to 0.02 and less than or equal to 0.04. The preparation method comprises the following steps of: (1), preparing a base material according to the stoichiometric ratio and a sodium niobate (NaNbO3) sheet template for texturegrowth of crystal grains; (2), weighing the base material, the template and a MnO2 sintering aid according to the stoichiometric ratio, placing the weighed base material, template and MnO2 sintering aid in a nylon tank, adding a solvent, a dispersant and a binder, and uniformly stirring the mixture to obtain casting slurry with good fluidity; (3) casting the slurry to obtain a strip-shaped thick film, cutting the thick film after the thick film is dried, laminating and hot pressing the thick film into a ceramic blank body; (4) removing the blank body from the adhesive, and sintering the blankbody by using a two-step sintering process to obtain lead-free textured piezoelectric ceramic, wherein the lead-free textured piezoelectric ceramic has high piezoelectric performance and a high Curietemperature. The environment-friendly lead-free piezoelectric ceramic material has higher practical value in the fields of low and medium temperature sensors, transducers, drivers and the like.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, in particular to a lead-free textured piezoelectric ceramic material with high piezoelectric response and high Curie temperature and a preparation method thereof. Background technique [0002] Piezoelectric ceramic materials can realize mutual conversion between electrical energy and mechanical energy. Piezoelectric ceramic materials have both direct piezoelectric and inverse piezoelectric (electrostrain) effects and are widely used in communications, medical, military and aerospace fields. The performance parameters of piezoelectric ceramic materials determine its usable environment and usable temperature range. In recent years, researchers at home and abroad have conducted extensive research on piezoelectric ceramic materials, which mainly include lead zirconate titanate Pb(Zr,Ti)O 3 (PZT) based piezoelectric ceramic material, sodium bismuth titanate (Bi 0.5 Na 0.5 )TiO 3 (BNT) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/626C04B35/638C04B35/64C04B41/88
CPCC04B35/453C04B35/622C04B35/62605C04B35/638C04B35/64C04B41/5116C04B41/88C04B2235/3201C04B2235/3244C04B2235/3251C04B2235/3294C04B2235/6025C04B2235/661C04B41/4539C04B41/0072
Inventor 沈波李朋翟继卫杨伟伟
Owner TONGJI UNIV
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