Composite piezoelectric ceramic element

Abstract

The utility model discloses a kind of composite piezoelectric ceramic elements, including first material layer and second material layer, the first material layer is used as receiving ultrasonic signal, this first material layer is pressed into ceramic ring or ceramic pipe, the second material layer is used as transmitting ultrasonic signal, this second material layer is pressed into ceramic wafer or ceramic round bar, the second material layer is pressed and embedded to first material layer and is integrally sintered with first material layer by glue removal;The utility model has the performance characteristics of PZT-5 series material and PZT-4 series material, is applicable to the performance of ultrasonic sensor in receiving dual-purpose piezoelectric ceramic transducer, can simultaneously improve the signal strength of receiving and transmitting in ultrasonic sensor in receiving dual-purpose piezoelectric ceramic transducer.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric ceramic technology, specifically to a composite piezoelectric ceramic element. Background Technology

[0002] Piezoelectric ceramics, due to their piezoelectric effect, are widely used in the manufacture of underwater acoustic transducers, electroacoustic transducers, and ultrasonic transducers. Currently, the most widely used piezoelectric ceramics are lead zirconate titanate (PZT)-based piezoelectric ceramics. Based on their performance characteristics, PZT TzT piezoelectric ceramics are further divided into hard and soft materials. Hard materials mainly include the PZT-5 series, while soft materials are mainly represented by the PZT-4 and PZT-8 series. PZT-4 and PZT-8 are suitable for transmitting ultrasonic transducers in piezoelectric ultrasonic sensors, while PZT-5 materials are suitable for transmitting ultrasonic transducers in piezoelectric ultrasonic sensors. Currently, transducers in piezoelectric ultrasonic sensors are usually dual-purpose (transmitting and receiving), generally using piezoelectric ceramic elements made of PZT-5 or PZT-4 materials. However, transducers made of PZT-5 materials have low transmitting amplitude but high receiving amplitude, while transducers made of PZT-4 materials have high transmitting amplitude but low receiving amplitude. Therefore, there is an urgent need for a piezoelectric ceramic element that can improve the receiving and transmitting amplitudes of transceiver transducers in ultrasonic sensors. Utility Model Content

[0003] The purpose of this invention is to provide a composite piezoelectric ceramic element that combines the performance characteristics of both PZT-5 and PZT-4 series materials, and is suitable for transceiver piezoelectric ceramic transducers.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a composite piezoelectric ceramic element, comprising:

[0005] A first material layer, which serves to receive ultrasonic signals, is pressed into a ceramic ring or a ceramic tube.

[0006] A second material layer, which is used to emit ultrasonic signals, is pressed into a ceramic disc or a ceramic rod.

[0007] Wherein, the second material layer is pressed and embedded into the first material layer and sintered together with the first material layer to form a whole, and the cross-sectional area of ​​the second material layer does not exceed the cross-sectional area of ​​the first material layer.

[0008] Furthermore, the first material layer is a ceramic ring, and the second material layer is a ceramic disc. The ceramic disc is pressed, embedded into the core of the ceramic ring, and sintered together with adhesive to form a composite piezoelectric ceramic element.

[0009] Furthermore, the center of the ceramic disc coincides with the center of the ceramic ring, and the diameter D2 of the ceramic disc does not exceed the outer ring diameter D1 of the ceramic ring.

[0010] Furthermore, the first material layer is made of a ceramic tube, and the second material layer is made of a ceramic rod. The ceramic rod is embedded in the inner cavity of the ceramic tube and sintered together to form a composite piezoelectric ceramic element.

[0011] Furthermore, the first material layer is a PZT-5 series hard material, and the second material layer is a PZT-4 series soft material.

[0012] The beneficial effects of this utility model are: This utility model combines the performance characteristics of PZT-5 series materials and PZT-4 series materials, and is suitable for transceiver piezoelectric ceramic transducers in ultrasonic sensors, which can simultaneously improve the signal strength of the transceiver piezoelectric ceramic transducers in ultrasonic sensors. Attached Figure Description

[0013] Figure 1 This is a top view of the structure of the composite piezoelectric ceramic element of this utility model in embodiment one;

[0014] Figure 2 This is a bottom view of the structure of the composite piezoelectric ceramic element of this utility model in embodiment one;

[0015] Figure 3 This is a front view of the structure of the composite piezoelectric ceramic element used in Embodiment 2 of this utility model.

[0016] In the diagram: 1 is the first material layer, and 2 is the second material layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] Please see Figure 1-2This invention provides a technical solution for a composite piezoelectric ceramic element, comprising a first material layer 1 and a second material layer 2. The first material layer 1 is used to receive ultrasonic signals, and the second material layer 2 is used to transmit ultrasonic signals. The second material layer 2 is pressed and embedded into the first material layer 1 and sintered with the first material layer 1 using adhesive. The first material layer 1 is, but is not limited to, a ceramic ring, and the second material layer 2 is, but is not limited to, a ceramic disc. The ceramic disc is pressed and embedded into the core of the ceramic ring and sintered with adhesive to form a composite piezoelectric ceramic element. The center of the ceramic disc coincides with the center of the ceramic ring, and the diameter D2 of the ceramic disc does not exceed the outer ring diameter D1 of the ceramic ring. The first material layer 1 is a PZT-5 series hard material, and the second material layer 2 is a PZT-4 series soft material.

[0019] In this process, PZT-4 series soft material is pressed into a circular green blank as the second material layer 2, and PZT-5 series hard material is pressed into a circular green blank as the first material layer 1. The circular green blank is then pressed into the circular green blank. The ceramic disc is embedded into the core of the ceramic ring by pressing, and then the binder is removed and sintered into one piece. The required thickness is ground according to the frequency parameters of the piezoelectric ceramic element. After binder removal, sintering and grinding, it is then polarized with silver to obtain a composite piezoelectric ceramic sheet with an outer diameter of 14mm, a core of 8mm and a thickness of 2.1mm. At this time, the back side of the first material layer 1 serves as the negative electrode surface, and the upper surface of the second material layer 2 serves as the positive electrode surface.

[0020] This composite piezoelectric ceramic element, assembled according to a specific area ratio, consists of a ceramic ring made of PZT-5 series hard material and an inner core of a ceramic disc made of PZT-4 series soft material. In use, the PZT-4 series soft material portion of the ceramic disc is used to transmit ultrasonic signals, while the PZT-5 series hard material portion of the ceramic ring is used to receive ultrasonic signals. Example

[0021] Please see Figure 3 This invention provides a technical solution for a composite piezoelectric ceramic element, comprising a first material layer 1 and a second material layer 2. The first material layer 1 is used to receive ultrasonic signals, and the second material layer 2 is used to transmit ultrasonic signals. The second material layer 2 is pressed and embedded into the first material layer 1 and sintered with the first material layer 1 together with adhesive. The cross-sectional area of ​​the second material layer 2 does not exceed the cross-sectional area of ​​the first material layer 1. The first material layer 1 is a ceramic tube, and the second material layer 2 is a ceramic rod. The ceramic rod is embedded in the inner cavity of the ceramic tube and sintered with adhesive to form a composite piezoelectric ceramic element. The first material layer 1 is a PZT-5 series hard material, and the second material layer 2 is a PZT-4 series soft material.

[0022] Among them, PZT-5 series materials are formed into green blanks and pressed into ceramic round tubes, and PZT-4 series materials are formed into green blanks and pressed into ceramic round rods. The round rods are first sintered and then ground to the required size. Then the round rods are inserted into the green ceramic round tubes to remove the glue and sinter them into one piece. The thickness is required according to the frequency parameters.

[0023] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0024] The above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be understood that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present utility model, and these all fall within the protection scope of the present utility model. In the present utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "joining", "fixing", etc. should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components. Among them, there are various ways of detachable installation, such as by plugging and snapping, or by bolt connection, etc.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite piezoelectric ceramic element, characterized by, include: A first material layer, which serves to receive ultrasonic signals, is pressed into a ceramic ring or a ceramic tube. A second material layer, which is used to emit ultrasonic signals, is pressed into a ceramic disc or a ceramic rod. Wherein, the second material layer is pressed and embedded into the first material layer and sintered together with the first material layer to form a whole, and the cross-sectional area of ​​the second material layer does not exceed the cross-sectional area of ​​the first material layer.

2. The composite piezoelectric ceramic element according to claim 1, characterized by: The first material layer is a ceramic ring, and the second material layer is a ceramic disc. The ceramic disc is pressed and embedded into the core of the ceramic ring and sintered together with adhesive to form a composite piezoelectric ceramic element.

3. The composite piezoelectric ceramic element according to claim 2, characterized in that: The center of the ceramic disc coincides with the center of the ceramic ring, and the diameter D2 of the ceramic disc does not exceed the outer ring diameter D1 of the ceramic ring.

4. The composite piezoelectric ceramic element according to claim 1, characterized by: The first material layer is a ceramic tube, and the second material layer is a ceramic rod. The ceramic rod is embedded in the inner cavity of the ceramic tube and sintered together to form a composite piezoelectric ceramic element.

5. The composite piezoelectric ceramic element according to claim 1, characterized by: The first material layer is a PZT-5 series hard material, and the second material layer is a PZT-4 series soft material.

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