Preparation method of A-site ion-doped sodium bismuth titanate based lead-free piezoelectric ceramic and product obtained by method

A lead-free piezoelectric, bismuth sodium titanate-based technology, applied in the field of high-performance A-site ion-doped bismuth sodium titanate-based lead-free piezoelectric ceramic materials and its preparation, can solve human health and ecological problems Environmental hazards and pollution and other issues, to achieve the effect of optimizing sintering temperature and improving strain performance

Inactive Publication Date: 2019-06-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large proportion of piezoelectric ceramic materials currently used in the market are mainly lead-based materials, and lead-based piezoelectric ceramics (PZT) contain a large amount of Pb, which will cause serious damage...

Method used

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  • Preparation method of A-site ion-doped sodium bismuth titanate based lead-free piezoelectric ceramic and product obtained by method
  • Preparation method of A-site ion-doped sodium bismuth titanate based lead-free piezoelectric ceramic and product obtained by method
  • Preparation method of A-site ion-doped sodium bismuth titanate based lead-free piezoelectric ceramic and product obtained by method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) According to the chemical formula 0.852 (Bi 0.5 [Na (1-x) Li x ] 0.5 }TiO 3 -0.110(Bi 0.5 K 0.5 )Ti0 3 -0.038BaTiO 3 Marked as BNKBT-xLi, where the stoichiometric ratio of x=0.12 Weigh the raw materials sodium carbonate, potassium carbonate, bismuth trioxide, titanium dioxide, lithium carbonate, and barium carbonate, mix them, and put them in a ball milling tank. The ball milling medium is dioxide Zirconium balls, ball milling agent anhydrous ethanol, the mass ratio of raw materials, anhydrous ethanol and zirconium dioxide balls is 1:2:2, ball milling for 5 hours, the ball mill speed is 800 rpm, put the mixed raw materials after ball milling into the oven Dry at 60℃;

[0025] (2) Put the dried mixed raw materials in step (1) into small crucibles, cover them, seal them, pre-fire in the furnace at 850°C, keep the temperature for 5 hours, then naturally cool to room temperature, open the furnace, and take out the mixed powder ;

[0026] (3) Grind the powder obtained in ste...

Embodiment 2

[0032] The basic steps are basically the same as in Example 1, except that in step (7), the sintering temperature is changed to 1140° C. to obtain bismuth sodium titanate-based lead-free piezoelectric ceramics.

Embodiment 3

[0034] The basic steps are basically the same as in Example 1, except that in step (7), the sintering temperature is changed to 1100° C. to obtain bismuth sodium titanate-based lead-free piezoelectric ceramics.

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Abstract

The invention discloses an A-site ion-doped sodium bismuth titanate based lead-free piezoelectric ceramic and a preparation method thereof. The sodium bismuth titanate based lead-free piezoelectric ceramic has the following chemical formula: 0.852{Bi<0.5>[Na<1-x>Li<x>]<0.5>}TiO<3>-0.110(Bi<0.5>K<0.5>)TiO<3>-0.038BaTiO<3>, and the chemical formula is denoted as BNKBT-xLi, wherein 0.12<=x<=0.13. Thepreparation method comprises the following steps: respectively preparing sodium carbonate, potassium carbonate, bismuth trioxide, titanium dioxide, lithium carbonate and barium carbonate according tothe chemical formula, performing ball milling, performing drying, performing pre-synthesis on the mixed raw materials at 800-900 DEG C, performing granulation, performing molding, performing debinding, and performing sintering at 1100-1140 DEG C to obtain the high-performance A-site ion-doped modified sodium bismuth titanate based lead-free piezoelectric ceramic. The method provided by the invention not only optimizes sintering temperature, reduces volatilization of an alkali metal, but also improves strain performance, wherein the maximum strain S is 0.42%, the inverse piezoelectric coefficient d33* is 760 pm/V, and the saturation polarization intensity Ps is 34-38 [mu]C/cm<2>.

Description

Technical field [0001] The invention belongs to a ceramic composition characterized by components, and particularly relates to a high-performance A-site ion-doped modified bismuth sodium titanate (BNT)-based lead-free piezoelectric ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric ceramic material is an important functional ceramic material that can realize mutual conversion between electrical energy and mechanical energy. Therefore, it has a wide range of applications in all aspects of human production and life, and it is an extremely important high-tech material. As the piezoelectric ceramic materials with a large proportion in the current market application are mainly lead-based materials, and lead-based piezoelectric ceramics (PZT) contain a large amount of Pb, they cause serious damage to human health and the ecological environment in the process of preparation, use and disposal. Hazards and pollution, so the research and develop...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622
Inventor 戴叶婧司远
Owner TIANJIN UNIV
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