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A barium titanate piezoelectric ceramic

A technology of piezoelectric ceramics and barium titanate, which is applied in the field of piezoelectric ceramics, can solve the problems that the electrical properties of lead-free piezoelectric ceramics cannot meet the requirements, and achieve low dielectric loss, high piezoelectric constant and electromechanical coupling coefficient, and dielectric The effect of high electric constant

Active Publication Date: 2018-12-28
GUIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increasingly diversified and complex requirements of piezoelectric ceramic components, the existing barium calcium zirconate titanate Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 The electrical properties of lead-free piezoelectric ceramics can no longer meet the requirements

Method used

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  • A barium titanate piezoelectric ceramic
  • A barium titanate piezoelectric ceramic
  • A barium titanate piezoelectric ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of barium titanate piezoelectric ceramics, its formula is as follows: with BaCO 3 and TiO 2 As the main raw material, CaCO 3 , ZrO 2 and Co 2 o 3 is a dopant, where BaCO 3 、TiO 2 , CaCO 3 , ZrO 2 The molar ratio is (Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 ,Co 2 o 3 The mass percent content is 0.05wt%.

[0054] A method for preparing the aforementioned barium titanate piezoelectric ceramics, the steps are as follows:

[0055] (1) Ingredients: take the main raw materials and dopant in the formula, bake in an oven at 100°C for 8 hours, dry, and set aside;

[0056] (2) Mixing: mix the dried main raw materials and dopant, and mix well to obtain a mixture;

[0057] (3) Synthesis: calcining the mixture in an environment of 1200-1210°C for 4 hours, and then cooling naturally with the furnace to obtain a composite;

[0058] (4) Pulverization: pulverize the composition to a powder with a particle size of 10 μm, and then dry the powder to obtain a dried powde...

Embodiment 2

[0063] A kind of barium titanate piezoelectric ceramics, its formula is as follows: with BaCO 3 and TiO 2 As the main raw material, CaCO 3 , ZrO 2 and Co 2 o 3 is a dopant, where BaCO 3 、TiO 2 , CaCO 3 , ZrO 2 The molar ratio is (Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 ,Co 2 o 3 The mass percent content is 0.1wt%.

[0064] A method for preparing the aforementioned barium titanate piezoelectric ceramics, the steps are as follows:

[0065] (1) Ingredients: take the main raw materials and dopant in the formula, bake in an oven at 100°C for 8 hours, dry, and set aside;

[0066] (2) Mixing: mix the dried main raw materials and dopant, and mix well to obtain a mixture;

[0067] (3) Synthesis: calcining the mixture in an environment of 1220-1230°C for 3.5 hours, and then cooling naturally with the furnace to obtain a composite;

[0068] (4) Pulverization: pulverize the composition to a powder with a particle size of 10 μm, and then dry the powder to obtain a dried powd...

Embodiment 3

[0073] A kind of barium titanate piezoelectric ceramics, its formula is as follows: with BaCO 3 and TiO 2 As the main raw material, CaCO 3 , ZrO 2 and Co 2 o 3 is a dopant, where BaCO 3 、TiO 2 , CaCO 3 , ZrO 2 The molar ratio is (Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 ,Co 2 o 3 The mass percent content is 0.15wt%.

[0074] A method for preparing the aforementioned barium titanate piezoelectric ceramics, the steps are as follows:

[0075] (1) Ingredients: take the main raw materials and dopant in the formula, bake in an oven at 100°C for 8 hours, dry, and set aside;

[0076] (2) Mixing: mix the dried main raw materials and dopant, and mix well to obtain a mixture;

[0077] (3) Synthesis: calcining the mixture in an environment of 1240-1250°C for 3 hours, and then cooling naturally with the furnace to obtain a composite;

[0078] (4) Pulverization: pulverize the composition to a powder with a particle size of 10 μm, and then dry the powder to obtain a dried powde...

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Abstract

The invention discloses a barium titanate piezoelectric ceramic and a preparation method thereof. The ceramic of the invention is prepared by using BaCO3 and TiO2 as main raw materials, and using calcium phase, zirconium phase and cobalt phase as dopants. The preparation method is to first take the main raw materials and doping agents and dry them respectively; mix the dried main raw materials and doping agents and mix them thoroughly to obtain a mixture; and calcine the mixture in an environment of 1160-1280°C to obtain a synthetic mixture. material; pulverize the composite to obtain powder, and then dry the powder to obtain dried powder; add a binder to the dried powder to bond it, and then press it into discs under a pressure of 20Mpa; The disc is kept at 1350-1500°C for four hours, and then taken out after cooling to obtain a sintered product. Finally, the sintered product is subjected to electrode and polarization treatment to obtain barium titanate piezoelectric ceramics. The piezoelectric ceramic of the present invention has low dielectric loss, high dielectric constant and high piezoelectric coefficient.

Description

technical field [0001] The invention relates to a piezoelectric ceramic, in particular to a barium titanate piezoelectric ceramic. Background technique [0002] Lead zirconate titanate (PZT)-based piezoelectric ceramics exhibit excellent piezoelectric properties due to the quasi-isotropic phase boundary (MPB) in which the trigonal and tetragonal phases coexist. However, PZT piezoelectric ceramic devices will produce lead pollution in the process of preparation, application and recycling, and even lead to chronic lead poisoning of human body. Therefore, the development of high-performance and environment-friendly piezoelectric ceramic materials has become an urgent need for the development of piezoelectric devices. In recent years, barium titanate (BaTiO 3 , BT)-based lead-free systems have received widespread attention. BaTiO by Liu et al. 3 Doped with Zr 4+ , Ca 2+ Barium Calcium Zirconate Titanate Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 Lead-free piezoelectric ceramic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/468C04B35/622H10N30/853
Inventor 刘其斌姚利兰
Owner GUIZHOU UNIV
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