Piezoelectric ceramic material with high piezoelectric 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 Orientation, simple preparation process, and low production cost

Active Publication Date: 2021-10-08
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 piezoelectric response and high Curie temperature and preparation method thereof
  • Piezoelectric ceramic material with high piezoelectric 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 piezoelectric response and high Curie temperature and a preparation method thereof, the stoichiometric ratio conforms to the general chemical formula (1-x)(K 0.48 Na 0.52 )(Nb 1‑y Sb y )O 3 ‑xBi 0.5 (Na 0.8 K 0.2 ) 0.5 ZrO 3 ; Wherein, 0.02≤x≤0.04, 0.02≤y≤0.04, its preparation method is: (1) prepare the base material that meets above-mentioned stoichiometric ratio and the sodium niobate (NaNbO 3 ) sheet template; (2) base material, template and MnO 2 The sintering aid is weighed according to the stoichiometric ratio and placed in a nylon tank, and the solvent, dispersant and binder are added and stirred evenly to obtain a casting slurry with good fluidity; (3) the slurry is cast to obtain a long strip Thick film, after the thick film is dried, it is cut, laminated and hot-pressed into a ceramic green body; (4) The green body is debonded, and then the lead-free textured piezoelectric ceramic obtained by sintering with a two-step sintering process has High piezoelectric properties and high Curie temperature. The environment-friendly lead-free piezoelectric ceramic material has high practical value in the fields of low and medium temperature sensors, transducers and drivers.

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 Patents(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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