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BCTZ-based perovskite system multi-component lead-free piezoelectric ceramic and preparation method thereof

A lead-free piezoelectric and perovskite technology, which is applied in the field of ceramic compositions, can solve the problems of high pre-sintering sintering temperature, unstable sintering performance, and difficulty in densification during sintering, so as to achieve cost reduction, stable piezoelectric performance, and low Effect of sintering and pre-firing temperature

Inactive Publication Date: 2013-02-13
TIANJIN UNIV
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Problems solved by technology

However, this method requires higher pre-sintering (1350°C) and sintering temperatures (1550°C), which are higher than the sintering temperature requirements of industrial production, which seriously restricts its mass production.
Potassium sodium niobate system, especially the literature "Y.Saito, et al. "Lead-Free Piezoceramics", nature, 432 (2004) 84-87." Using the traditional solid-state sintering method to prepare relatively high piezoelectric performance Potassium sodium niobate lithium tantalum antimony lead-free piezoelectric ceramics. The sintering temperature of the piezoelectric ceramics prepared by this method is lower than 1100°C, but it contains a large amount of volatile elements such as lithium, potassium and sodium. The sintering process is difficult to be dense and the sintering performance is not good. Stablize

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  • BCTZ-based perovskite system multi-component lead-free piezoelectric ceramic and preparation method thereof
  • BCTZ-based perovskite system multi-component lead-free piezoelectric ceramic and preparation method thereof

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Effect test

Embodiment 1

[0027] A kind of BCTZ based perovskite system multi-element lead-free piezoelectric ceramics of the present invention, its raw material component and its molar percentage are (1-y)[(1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 ]-y[(Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 -Sb 0.08 Ta 0.04 )O], where x=0.40~0.50, y=0.001~0.05;

[0028] This embodiment can be divided into two components:

[0029] ①(Ba,Ca)(Ti,Zr)O 3 , referred to as BCTZ, namely (1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 , where x=0.48.

[0030] ② (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 , referred to as KNNLST.

[0031] The preparation steps are as follows:

[0032] (1) with BaCO 3 , CaCO 3 , ZrO 2 ,TiO 2 The ingredients were weighed according to the stoichiometric ratio, and the prepared raw materials were ball-milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 1100°C, kept for 2 hours to obtain BCTZ powder.

[003...

Embodiment 2

[0054] The (Ba, Ca) (Ti, Zr) O of this embodiment 3 The (BCTZ) component is (1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 , where x=0.45. Another group is (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 .

[0055] Analytical grade BaCO 3 , ZrO 2 ,TiO 2 and 98.0 CaCO 3 According to the stoichiometric ratio of BCTZ, the prepared materials were ball milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 1000°C, kept for 2 hours to obtain BCTZ powder. Use Li 2 CO 3 , K 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , Ta 2 o 5 and Sb 2 o 3 Batching is carried out according to the stoichiometric ratio of KNNLST, the prepared material is ball milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, then pre-fired at 850°C, kept for 2 hours to obtain KNNLST powder. Weigh the BCTZ and KNNLST powders as (1-y)BCTZ-yKNNLST (y=0.05), ball mill them in absolute ethanol for 6 hours, dry them at 1...

Embodiment 3

[0060] The (Ba, Ca) (Ti, Zr) O of this embodiment 3 The (BCTZ) component is (1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 , where x=0.40. Another group is (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 .

[0061] with BaCO 3 , CaCO 3 , ZrO 2 ,TiO 2 The batching was carried out according to the stoichiometric ratio of BCTZ, and the prepared material was ball-milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 1100°C, kept for 2 hours to obtain BCTZ powder. Use Li 2 CO 3 , K 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , Ta 2 o 5 and Sb 2 o 3 Batching is carried out according to the stoichiometric ratio of KNNLST, the prepared material is ball milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, then pre-fired at 850°C, kept for 2 hours to obtain KNNLST powder. Weigh the BCTZ and KNNLST powders as (1-y)BCTZ-yKNNLST (y=0.015), ball mill them in absolute ethanol for 6 hours, ...

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Abstract

The invention discloses BCTZ-based perovskite system multi-component lead-free piezoelectric ceramic and a preparation method thereof. Raw material components in molar percent are represented by (1-y)[(1-x)Ba(Zr0.2Ti0.8)O3-x(Ca0.7Ca0.3)O3]-y[(Na0.52K0.44Li0.04)(Nb0.88-Sb0.08Ta0.04)O3], wherein x is 0.40 to 0.50; and y is 0.001 to 0.05. A principal crystalline phase of the material has a perovskite structure, the piezoelectric constant d33 is up to 464pC / N, the electromechanical coupling factor kp is up to 0.5, the performance of the traditional lead-containing piezoelectric ceramic is reached, and the preparation process is stable and repeatable; and the existence of Na, K and Li ions can reduce sintering and calcining temperature, and the piezoelectric ceramic has a good application prospect.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a barium calcium zirconate titanate doped with various elements to prepare multi-element mixed perovskite system piezoelectric ceramics and a preparation method thereof. Background technique [0002] Piezoelectric ceramics, as a modern and important high-tech functional material, have been used in various fields such as military and civil, especially in the fields of ultrasonic transducers, sensors, non-destructive testing and communication technology. This year, along with the world's awareness of human's own environment, with special emphasis on the application of environmentally friendly materials, lead zirconate titanate piezoelectric ceramics, which are dominant, have been banned in Europe. It is believed that lead-containing piezoelectric ceramics will be banned worldwide in the near future. Therefore, it is urgent to find lead-free piezoelectric materia...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 戴叶婧许威
Owner TIANJIN UNIV
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