Bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric property, and preparation method thereof

A technology of depolarization temperature and bismuth ferrite, which is applied in the field of functional ceramics, can solve the problems of not being able to meet the requirements of high depolarization temperature and high-voltage electrical performance at the same time, achieve broad industrial application prospects, low preparation cost, and a preparation method simple effect

Inactive Publication Date: 2020-12-11
TONGJI UNIV
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric performance and its preparation method, which is used to solve the problem that existing piezoelectric ceramic materials cannot meet the requirements of high depolarization temperature and high piezoelectric performance at the same time. The problem of high voltage performance requirements

Method used

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  • Bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric property, and preparation method thereof
  • Bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric property, and preparation method thereof
  • Bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric property, and preparation method thereof

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preparation example Construction

[0037] The preparation method of the above-mentioned bismuth ferrite-based piezoelectric ceramic material comprises the following steps:

[0038] 1) Bi with a purity greater than 99% 2 o 3 , Fe 2 o 3 , PbO, BaCO 3 、TiO 2 It is used as the raw material of bismuth ferrite-based piezoelectric ceramic material and mixed according to the stoichiometric ratio, then mixed with absolute ethanol and zirconia balls and subjected to a ball mill for 10-14 hours, and after drying, the dried powder is obtained;

[0039] 2) Put the dried powder in a muffle furnace, and pre-burn it at 750°C for more than 5 hours (preferably 5 hours), to obtain the pre-fired powder;

[0040] 3) Combine the calcined powder with MnO 2 , anhydrous ethanol and zirconia balls are mixed and subjected to secondary ball milling for 12 hours. After the material is discharged and dried, it is mixed with 5wt% polyvinyl alcohol solution (PVA) to granulate. After sieving, it is pressed under a molding pressure of 7MP...

Embodiment 1

[0047] A bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric performance, its general chemical formula is 0.90(0.725BiFeO 3 -0.275BaTiO 3 )-0.10PbTiO 3 +0.8mol%MnO 2 , its preparation method comprises the following steps:

[0048] 1) Bi with a purity greater than 99% 2 o 3 , Fe 2 o 3 , PbO, BaCO 3 、TiO 2 It is used as the raw material of bismuth ferrite-based piezoelectric ceramic material and mixed according to the stoichiometric ratio, then mixed with absolute ethanol and zirconia balls and subjected to a ball mill for 12 hours, and the dried powder is obtained after discharging and drying;

[0049] 2) Put the dried powder in a muffle furnace, and pre-burn it at 750°C for 5 hours to obtain the pre-fired powder;

[0050] 3) Mix the calcined powder with 0.8mol% MnO 2 , anhydrous ethanol and zirconia balls are mixed and subjected to secondary ball milling for 12 hours. After the material is discharged and dr...

Embodiment 2

[0057] A bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric performance, whose general chemical formula is 0.85(0.725BiFeO 3 -0.275BaTiO 3 )-0.15PbTiO 3 +0.8mol%MnO 2 , its preparation method comprises the following steps:

[0058] 1) Bi with a purity greater than 99% 2 o 3 , Fe 2 o 3 , PbO, BaCO 3 、TiO 2 It is used as the raw material of bismuth ferrite-based piezoelectric ceramic material and mixed according to the stoichiometric ratio, then mixed with absolute ethanol and zirconia balls and subjected to a ball mill for 12 hours, and the dried powder is obtained after discharging and drying;

[0059] 2) Put the dried powder in a muffle furnace, and pre-burn it at 750°C for 5 hours to obtain the pre-fired powder;

[0060] 3) Mix the calcined powder with 0.8mol% MnO 2 , anhydrous ethanol and zirconia balls are mixed and subjected to secondary ball milling for 12 hours. After the material is discharged and ...

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Abstract

The invention relates to a bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric property, and a preparation method thereof, wherein the general chemical formula of the bismuth ferrite-based piezoelectric ceramic material is (1-x)(0.725BiFeO3-0.275BaTiO3)-xPbTiO3+0.8 mol% MnO2, and x is greater than or equal to 0.1 and less than or equal to 0.3. The preparation method comprises the following steps: mixing all metal oxide raw materials, sequentially carrying out ball milling, drying and presintering, mixing with a manganese source, carrying out secondary ball milling and drying, mixing with PVA, granulating, and carrying out compression molding to obtain a ceramic green body; and finally carrying out rubber discharging and sinteringon the ceramic green body to obtain the bismuth ferrite-based piezoelectric ceramic material. Compared with the prior art, the bismuth ferrite-based piezoelectric ceramic material disclosed by the invention has the advantages that the preparation method is simple, economic, practical and the like, and the prepared bismuth ferrite barium titanate-based piezoelectric ceramic has high Curie temperature, excellent temperature stability and relatively high piezoelectric constant, and shows a wide industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of functional ceramics, and relates to a bismuth ferrite-based piezoelectric ceramic material with high depolarization temperature and high piezoelectric performance and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are a class of electronic ceramic materials with piezoelectric properties. When compressive stress is applied to both ends of the material, the surface of the material generates charges with opposite signs and the same number. The polarization vectors inside the unpolarized polycrystalline ceramics are chaotically oriented, and will not show polarity to the outside. Applying a constant external electric field across the ceramic can make the polarization vector preferentially oriented along the direction of the electric field. When it reaches the saturated polarization treatment, the polycrystalline ceramic still retains a certain macroscopic remanent polariza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/638C04B41/88C04B41/80
CPCC04B35/453C04B35/622C04B35/638C04B41/5116C04B41/80C04B41/88C04B2235/3215C04B2235/3232C04B2235/3262C04B2235/3272C04B2235/3296C04B2235/6562C04B2235/6567C04B41/4539C04B41/0072
Inventor 翟继卫史云晶沈波
Owner TONGJI UNIV
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