Ultrasonic sensor, piezoelectric composite ceramic chip and preparation method of blank of piezoelectric composite ceramic chip

A piezoelectric ceramic sheet, piezoelectric composite technology, applied in the field of sensors, can solve the problems of composite materials that cannot thin piezoelectric phase, complex process, large mechanical impact, etc., and achieve the effects of low cost, simple process and high sensitivity

CN114335324APending Publication Date: 2022-04-12CHENGDU HUITONG WEST ELECTRONIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-04-12

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Abstract

The invention relates to a sensor, in particular to an ultrasonic sensor, a piezoelectric composite ceramic piece and a preparation method of a blank of the piezoelectric composite ceramic piece, and the preparation method comprises the following steps: S1, arranging two division bars on one surface of the piezoelectric ceramic piece at an interval; s2, the area between the two parting strips is filled with a polymer to form a polymer phase, and the polymer phase is flush with the tops of the parting strips; s3, another piezoelectric ceramic piece is attached to the top of the polymer phase, and the parting strip is located between the two corresponding adjacent piezoelectric ceramic pieces; and S4, superposing the piezoelectric ceramic pieces layer by layer to form a piezoelectric composite ceramic piece blank. According to the preparation method of the piezoelectric composite ceramic piece blank, the distance between the adjacent piezoelectric ceramic pieces is only controlled by the thickness of the parting strips and is not limited by the defects of a traditional cutting-pouring method, and the minimum thickness can be achieved. The number of bubbles in the piezoelectric composite ceramic piece blank is smaller, the manufactured piezoelectric composite ceramic piece blank is higher in quality, and the performance of an ultrasonic sensor product is better.
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Description

technical field

[0001] The invention relates to a sensor, in particular to an ultrasonic sensor, a piezoelectric composite ceramic sheet and a preparation method thereof. Background technique

[0002] In the actual application scenarios of ultrasonic sensors with air / gas as the coupling medium, the high impedance difference between the sensor sensitive element and the measured medium is a key factor restricting the development of ultrasonic sensor technology. The acoustic impedance of gaseous media such as air, natural gas, and biogas is very small. For example, the acoustic impedance of air is only 420Rayl, while the acoustic impedance of conventional piezoelectric materials is as high as 30×10 6 -40×10 6 Rayl, such a high impedance difference reduces the ultrasonic energy entering the medium, which directly affects the performance of the sensor.

[0003] From the current public reports, it is the most direct way to reduce the high impedance difference between the sensiti...

Examples

Embodiment 1

[0059] Such as figure 1 and 2 As shown, the preparation method of a piezoelectric composite ceramic sheet blank described in this embodiment comprises the following steps:

[0060] S1. Two spacers 2 are arranged on one side of the piezoelectric ceramic sheet 1, and the two spacers 2 are arranged at intervals;

[0061] S2. filling the area between the two spacers 2 with a polymer to form a polymer phase 3, and the polymer phase 3 is flush with the top of the spacer 2;

[0062] S3. Paste another piezoelectric ceramic sheet 1 on the top of the polymer phase 3, and the spacer 2 is located between corresponding two adjacent piezoelectric ceramic sheets 1;

[0063] S4. Repeating S1 to S3, stacking the piezoelectric ceramic sheets 1 layer by layer to form a piezoelectric composite ceramic sheet blank.

[0064] The preparation method of a piezoelectric composite ceramic sheet blank described in this application is based on piezoelectric ceramic sheets 1, by setting spacers 2 betwee...

Embodiment 2

[0071] Such as Figure 1-4 As shown, the preparation method of a piezoelectric composite ceramic sheet described in this embodiment comprises the following steps:

[0072] A1. The piezoelectric composite ceramic sheet blank is made based on the preparation method of the piezoelectric composite ceramic sheet blank described in Example 1;

[0073] A2: reducing the air bubbles in the piezoelectric composite ceramic sheet blank, and solidifying the polymer;

[0074] A3: cutting the piezoelectric composite ceramic sheet blank solidified in step A2 to form a piezoelectric composite ceramic sheet.

[0075] Specifically, vacuuming is used to reduce air bubbles in the piezoelectric composite ceramic sheet blank.

[0076] Such as Figure 4 As shown, on the basis of the above, in a further preferred manner, when the piezoelectric composite ceramic sheet blank is cut, all the spacers 2 are cut off.

[0077] Beneficial effects of this embodiment: the preparation method of a piezoelectr...

Embodiment 3

[0079] Such as Figure 4 As shown, a preparation method for an ultrasonic sensor described in this embodiment comprises the following steps:

[0080] B1. based on the preparation method of the piezoelectric composite ceramic sheet described in embodiment 2, the piezoelectric composite ceramic sheet is made;

[0081] B2: Electrodes are installed and polarized on the opposite two surfaces of the piezoelectric composite ceramic sheet perpendicular to the polymer phase 3 to form a piezoelectric composite ceramic sheet assembly, wherein one electrode is the first electrode 5 and the other electrode is the first electrode 5 The second electrode 6, the first electrode 5 is a negative pole, and the second electrode 6 is a positive pole;

[0082] B3. draw the first electrode lead 7 on the side of the first electrode 5 away from the piezoelectric composite ceramic sheet, and draw the second electrode lead on the side of the second electrode 6 away from the piezoelectric composite ceram...