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Bismuth ferrite-barium titanate lead-free piezoelectric ceramic as well as preparation method and application thereof

A lead-free piezoelectric and barium titanate technology is applied in the field of preparation of bismuth ferrite-barium titanate lead-free piezoelectric ceramics, which can solve the problem that the performance of electronic equipment cannot be rapidly developed, the piezoelectric performance is not ideal, and the sintering temperature narrow interval, etc., to achieve the effect of high remanent polarization, favorable for industrial production and good crystallinity

Active Publication Date: 2021-10-01
LANZHOU UNIVERSITY +1
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Problems solved by technology

where BaTiO 3 The earliest application of ceramics, but with the development of science and technology, BaTiO with low Curie temperature (Tc=120°C) 3 Ceramics can no longer meet the needs of the rapid development of electronic equipment performance
Although bismuth sodium titanate-based lead-free piezoelectric ceramics have a large Curie temperature and remnant polarization at room temperature, it is difficult to completely polarize, the piezoelectric performance is not high, and the temperature stability is poor.
Although lead-free piezoelectric ceramics with bismuth layer structure has a high Curie temperature, it is difficult to completely polarize, and its application is greatly limited.
Potassium sodium niobate-based lead-free piezoelectric ceramics have made great progress after a lot of research. The modified potassium sodium niobate-based ceramics have high piezoelectric properties, but their Curie temperature is usually not high, and Due to the volatilization of K and Na elements, the sintering temperature range is narrow, and the temperature stability of its performance is poor.
BiFeO 3 Ceramics have received a lot of attention because of their extremely high Curie temperature, but since pure BiFeO 3 Ceramics are difficult to prepare and have poor piezoelectric properties, so the researchers used BiFeO 3 and BaTiO 3 Bismuth ferrite-barium titanate lead-free piezoelectric ceramics with high Curie temperature have been prepared by mixing, which will become a strong competitor that is expected to replace lead-containing piezoelectric ceramic materials
[0004] Although researchers have done a lot of research on bismuth ferrite-barium titanate lead-free piezoelectric ceramics, their piezoelectric performance is still not ideal, and the performance has a great relationship with the preparation process of ceramics.

Method used

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  • Bismuth ferrite-barium titanate lead-free piezoelectric ceramic as well as preparation method and application thereof
  • Bismuth ferrite-barium titanate lead-free piezoelectric ceramic as well as preparation method and application thereof
  • Bismuth ferrite-barium titanate lead-free piezoelectric ceramic as well as preparation method and application thereof

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preparation example Construction

[0057] A preparation method of bismuth ferrite-barium titanate lead-free piezoelectric ceramics, the chemical formula of the bismuth ferrite-barium titanate is (1-x)Bi y FeO 3 -xBaTiO 3 , x and y are mole fractions, x takes a value of 0.3 to 0.4, and y takes a value of 0.6 to 1.2. The raw materials for preparing the bismuth ferrite-barium titanate include Bi 2 o 3 ﹑ Fe 2 o 3 ﹑BaCO 3 and TiO 2 , the preparation method comprises the steps of:

[0058] Bi 2 o 3 ﹑ Fe 2 o 3 ﹑BaCO 3 and TiO 2 React in an environment of 780°C to 850°C to prepare the precursor;

[0059] Performing granulation treatment, molding treatment, debinding treatment and sintering treatment on the precursor to prepare ceramics;

[0060] Annealing treatment, silver burning treatment, quenching treatment and polarization treatment are performed on the ceramics.

[0061] The microstructure, density and charge defect concentration of bismuth ferrite-barium titanate lead-free piezoelectric ceramics a...

Embodiment 1

[0098] This embodiment provides a bismuth ferrite-barium titanate lead-free piezoelectric ceramic and its preparation method. The preparation method is as follows:

[0099] (1) Calculation: according to the prepared (1-x)Bi y FeO 3 -xBaTiO 3 The stoichiometric ratio in the formula accurately calculates the Bi in the formula 2 o 3 ﹑ Fe 2 o 3 ﹑BaCO 3 and TiO 2 The quality of x=0.3, y=1.02 among the present embodiment;

[0100] (2) Weighing: according to the pre-calculated Bi 2 o 3 ﹑ Fe 2 o 3 ﹑BaCO 3 and TiO 2 The mass of the sample is weighed, and the weighing is accurate to the thousandth, and then the weighed raw materials are put into the ball mill jar in turn;

[0101] (3) The first ball mill: use absolute ethanol as the ball mill medium, mix agate beads with a diameter of 5mm and zirconia beads with a diameter of 2mm in a ratio of 1:4, wherein raw materials: ball mill beads: mass of absolute ethanol Ratio = 1:4:1. After pre-mixing the ball anhydrous ethanol ...

Embodiment 2

[0114] This embodiment provides a bismuth ferrite-barium titanate lead-free piezoelectric ceramic and its preparation method. The preparation method is as follows:

[0115] (1) Calculation: according to the prepared (1-x)Bi y FeO 3 -xBaTiO 3 The stoichiometric ratio in the formula accurately calculates the Bi in the formula 2 o 3 ﹑ Fe 2 o 3 ﹑BaCO 3 and TiO 2 The quality of x=0.3, y=1.02 among the present embodiment;

[0116] (2) Weighing: according to the pre-calculated Bi 2 o 3 ﹑ Fe 2 o 3 ﹑BaCO 3 and TiO 2 The mass of the sample is weighed, and the weighing is accurate to the thousandth, and then the weighed raw materials are put into the ball mill jar in turn;

[0117] (3) The first ball mill: use absolute ethanol as the ball mill medium, mix agate beads with a diameter of 5mm and zirconia beads with a diameter of 2mm in a ratio of 1:4, wherein raw materials: ball mill beads: mass of absolute ethanol Ratio = 1:4:1. After pre-mixing the ball anhydrous ethanol ...

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Abstract

The invention relates to bismuth ferrite-barium titanate lead-free piezoelectric ceramic and an application thereof. The chemical formula of the bismuth ferrite-barium titanate is (1-x)BiyFeO3-xBaTiO3, x and y are mole fraction, x is 0.3-0.4, y is 0.6-1.2, the raw materials for preparing the bismuth ferrite-barium titanate comprise Bi2O3, Fe2O3, BaCO3 and TiO2, and the preparation method comprises the following steps: reacting Bi2O3, Fe2O3, BaCO3 and TiO2 at 780-850 DEG C to prepare a precursor; and performing granulation treatment, forming treatment, glue discharging treatment, sintering treatment, specific annealing treatment, silver firing treatment, quenching treatment and polarization treatment on the precursor. The microstructure, density and charge defect concentration of the ceramic are improved through annealing treatment, the ceramic generates lattice distortion in the high-temperature quenching process through quenching treatment after silver firing, and the piezoelectric property of the ceramic is cooperatively improved.

Description

technical field [0001] The invention belongs to the technical field of perovskite-type lead-free piezoelectric ceramics, and in particular relates to a preparation method and application of bismuth ferrite-barium titanate lead-free piezoelectric ceramics with high-voltage electrical properties. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can realize mutual conversion between electrical energy and mechanical energy. It is widely used in electronic components and is the cornerstone of the electronic information industry. Since the invention of piezoelectric ceramics, researchers have conducted a lot of research on it, and made many gratifying achievements, which greatly promoted the development of piezoelectric ceramics. Among them, lead-based piezoelectric ceramics are the most widely used, such as the most commonly used lead zirconate titanate (PZT) material, but lead-containing piezoelectric ceramics will inevitably cause serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B41/88
CPCC04B35/453C04B35/622C04B41/88C04B41/5116C04B2235/3215C04B2235/3236C04B2235/602C04B2235/6567C04B2235/662C04B41/4539C04B41/0072
Inventor 高美珍张曙光余腾飞
Owner LANZHOU UNIVERSITY
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