1-3 type piezoelectric composite material based on self-similar photonic crystal structure, and preparation method thereof

Abstract

The invention discloses a 1-3 type piezoelectric composite material based on a self-similar photonic crystal structure, and a preparation method thereof. The piezoelectric composite material comprises an upper electrode, a lower electrode, a polymer phase and a plurality of piezoelectric phases, the piezoelectric phases are polarized in the thickness direction, the piezoelectric phases are piezoelectric columns with hexagonal sections, and the plurality of piezoelectric columns are arranged in a hexagonal lattice form; the polymer phase is filled between the adjacent piezoelectric columns; and the upper electrode and the lower electrode are respectively positioned on the upper surface and the lower surface after the piezoelectric column and the polymer are compounded. Compared with a traditional 1-3 type piezoelectric composite material, the 1-3 type piezoelectric composite material has the advantages that a phonon crystal structure is combined with the 1-3 type piezoelectric composite material, so that transverse vibration of a piezoelectric vibrator during working is well inhibited, vibration in the thickness direction is purer, the working bandwidth is widened due to introduction of a self-similar structure, and the overall working efficiency is higher.

Description

technical field

[0001] The invention relates to the technical field of phonon crystals, in particular to a 1-3 type piezoelectric composite material based on a self-similar phonon crystal structure and a preparation method thereof. Background technique

[0002] Piezoelectric ultrasonic transducers are widely used in various scenarios, including ultrasonic welding, ultrasonic cleaning, medical imaging, industrial testing and other fields. Requirements for properties such as width are increasing all the time. Type 1-3 piezoelectric composite materials have been widely studied and applied because of their advantages such as low acoustic impedance, low dielectric constant, good flexibility, and large electromechanical coupling coefficient. The thickness mode is the most commonly used working mode. The 1-3 piezoelectric composite material working in the thickness mode is easy to couple with the transverse vibration, which leads to the interference of the vibration mode and affec...

Examples

Embodiment 1

[0035] Such as figure 1 As shown, this embodiment provides a 1-3 type piezoelectric composite material based on a self-similar phonon crystal structure, including an upper electrode 1 , a lower electrode 2 , an epoxy resin 3 , and a piezoelectric ceramic column 4 .

[0036] The piezoelectric phase material is defined as PZT-5H, which is polarized along the thickness direction, the polymer phase material is defined as epoxy resin 3, and the upper electrode 1 and the lower electrode 2 are respectively located on the upper and lower surfaces of the piezoelectric composite material. Among them, the piezoelectric phase is piezoelectric ceramic columns 4 with a hexagonal cross-sectional shape, which are arranged periodically, and each PZT piezoelectric column 4 is rotated by a certain angle relative to the surrounding piezoelectric columns, so as to keep no gap between the piezoelectric columns. The generation of parallel sides is arranged in a hexagonal lattice type, epoxy resin 3 ...

Embodiment 2

[0043] This embodiment provides a method for preparing a 1-3 type piezoelectric composite material based on a self-similar phonon crystal structure, and the specific steps are as follows:

[0044] 1. Inject the prepared PZT powder into a hexagonal mold, and pre-press it into an embryo body under a press (100MPa to 200MPa);

[0045] 2. Use a high-temperature resistance furnace to sinter the green body at a temperature of 950°C to 1300°C, and keep it warm for 2 hours to 2.5 hours after sintering to obtain a PZT piezoelectric column, and then use an ultrasonic cleaner to clean the piezoelectric column;

[0046]3. After the PZT piezoelectric columns are arranged in the form of hexagonal lattice in the fixture, the epoxy resin is poured and vacuumized to avoid residual air bubbles from affecting the performance of the piezoelectric composite material. When arranging the PZT piezoelectric columns, each piezoelectric column forms a certain angle with respect to the surrounding piezoe...

technical field

[0001] The invention relates to the technical field of phonon crystals, in particular to a 1-3 type piezoelectric composite material based on a self-similar phonon crystal structure and a preparation method thereof. Background technique

[0002] Piezoelectric ultrasonic transducers are widely used in various scenarios, including ultrasonic welding, ultrasonic cleaning, medical imaging, industrial testing and other fields. Requirements for properties such as width are increasing all the time. Type 1-3 piezoelectric composite materials have been widely studied and applied because of their advantages such as low acoustic impedance, low dielectric constant, good flexibility, and large electromechanical coupling coefficient. The thickness mode is the most commonly used working mode. The 1-3 piezoelectric composite material working in the thickness mode is easy to couple with the transverse vibration, which leads to the interference of the vibration mode and affec...

Examples

Embodiment 1

[0035] Such as figure 1 As shown, this embodiment provides a 1-3 type piezoelectric composite material based on a self-similar phonon crystal structure, including an upper electrode 1 , a lower electrode 2 , an epoxy resin 3 , and a piezoelectric ceramic column 4 .

[0036] The piezoelectric phase material is defined as PZT-5H, which is polarized along the thickness direction, the polymer phase material is defined as epoxy resin 3, and the upper electrode 1 and the lower electrode 2 are respectively located on the upper and lower surfaces of the piezoelectric composite material. Among them, the piezoelectric phase is piezoelectric ceramic columns 4 with a hexagonal cross-sectional shape, which are arranged periodically, and each PZT piezoelectric column 4 is rotated by a certain angle relative to the surrounding piezoelectric columns, so as to keep no gap between the piezoelectric columns. The generation of parallel sides is arranged in a hexagonal lattice type, epoxy resin 3 ...

Embodiment 2

[0043] This embodiment provides a method for preparing a 1-3 type piezoelectric composite material based on a self-similar phonon crystal structure, and the specific steps are as follows:

[0044] 1. Inject the prepared PZT powder into a hexagonal mold, and pre-press it into an embryo body under a press (100MPa to 200MPa);

[0045] 2. Use a high-temperature resistance furnace to sinter the green body at a temperature of 950°C to 1300°C, and keep it warm for 2 hours to 2.5 hours after sintering to obtain a PZT piezoelectric column, and then use an ultrasonic cleaner to clean the piezoelectric column;

[0046]3. After the PZT piezoelectric columns are arranged in the form of hexagonal lattice in the fixture, the epoxy resin is poured and vacuumized to avoid residual air bubbles from affecting the performance of the piezoelectric composite material. When arranging the PZT piezoelectric columns, each piezoelectric column forms a certain angle with respect to the surrounding piezoe...

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