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Preparation method of matching layer for relaxor ferroelectric single crystal ultrasonic transducer

A technology of relaxor ferroelectric single crystal and ultrasonic transducer, which is applied in the fields of industry and medicine, can solve the problems affecting the compact performance and the inability to realize mass production, and achieve high yield, convenient processing, and uniform distribution of material impedance Effect

Pending Publication Date: 2022-05-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the matching layer prepared by the doctor blade method is dense and free of pores, the limitation of the doctor blade method is that it cannot be mass-produced
Generally, the ordinary casting method is used for mass production. Although the vacuum degassing method can effectively reduce the gas involved in the mixing process inside the slurry, new gas will be involved in the injection molding process, which will affect its compactness. performance

Method used

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  • Preparation method of matching layer for relaxor ferroelectric single crystal ultrasonic transducer
  • Preparation method of matching layer for relaxor ferroelectric single crystal ultrasonic transducer
  • Preparation method of matching layer for relaxor ferroelectric single crystal ultrasonic transducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of this example 1 is: first put the HN20 hollow glass (silicon dioxide and aluminum oxide) powder produced by Yixiang New Material Co., Ltd. Liquid epoxy resin and 18-20wt% hollow glass powder as raw materials, plus 18-20wt% curing agent (98.5wt% diethylenetriamine and 1.5wt% butyl glycidyl ether), fully mixed for 3 ~ 10 minutes to prepare the slurry; put the slurry in a vacuum drying oven at room temperature, and perform vacuum degassing for 10 minutes at 25°C and a pressure of -0.1MPa, and cycle 3 times. Then inject the processed slurry into the mold, put it into a centrifuge for centrifugal degassing (500 rpm, 5 minutes, cycle 2 times), solidify the centrifuged slurry at room temperature (25°C) for 36h, and degas After molding, it is selected and thinned according to the required impedance, and the matching layer of the required relaxation ferroelectric single crystal ultrasonic transducer is obtained. Under the test conditions of room tempera...

Embodiment 2

[0040]The preparation method of Example 2 is as follows: first put the zirconia powder into an oven at 50°C to dry for more than 6 hours, and use 15-17wt% bisphenol A liquid epoxy resin and 77-80wt% zirconia powder as raw materials , add 5-6wt% curing agent (diethylenetriamine), and mix thoroughly for 3-10 minutes to make a slurry; put the slurry in a vacuum oven at room temperature, at 25°C and a pressure of -0.1MPa, carry out 10min vacuum degassing, and cycle 4 times. Then inject the treated slurry into the mold, put it into a centrifuge for centrifugal degassing (500 rpm, 5 minutes, cycle 2 times), and solidify the centrifuged slurry at room temperature (25°C) for 36 hours. After demolding The matching layer of the relaxation ferroelectric single crystal ultrasonic transducer is obtained by selecting and thinning according to the required impedance. Under the test conditions of room temperature (25° C.) and a frequency of 5 MHz, the acoustic impedance of the matching layer...

Embodiment 3

[0042] The preparation method of Example 3 is as follows: first put the alumina powder into an oven at 50° C. to dry for more than 6 hours, use 56 to 66 wt % of bisphenol A liquid epoxy resin and 17 to 30 wt % of alumina powder as raw materials, and then Add 14-17wt% curing agent (modified polyether amine), and mix thoroughly for 3-10 minutes to make a slurry; put the slurry in a vacuum oven at room temperature, at 25°C and a pressure of -0.1MPa, for 10 minutes The vacuum degassing, and the number of cycles 5 times. Then inject the treated slurry into the mold, put it into a centrifuge for centrifugal degassing (500 rpm, 5 minutes, cycle 3 times), and solidify the centrifuged slurry at room temperature (25°C) for 36 hours. After demolding The matching layer of the relaxation ferroelectric single crystal ultrasonic transducer is obtained by selecting and thinning according to the required impedance. Under the test conditions of room temperature (25° C.) and a frequency of 5 MH...

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Abstract

The invention relates to a preparation method of a matching layer for a relaxor ferroelectric single crystal ultrasonic transducer, which comprises the following steps: (1) mixing bisphenol A type liquid epoxy resin, inorganic filler powder and a curing agent to obtain slurry; and (2) sequentially carrying out vacuum degassing, injection molding and centrifugal degassing on the obtained slurry, and curing at 15-35 DEG C to obtain the matching layer for the relaxor ferroelectric single crystal ultrasonic transducer.

Description

technical field [0001] The invention relates to a method for preparing a matching layer for a relaxation ferroelectric single crystal ultrasonic transducer, belonging to the fields of industry and medicine. Background technique [0002] The ultrasonic transducer is an energy conversion device that converts alternating electrical signals and acoustic signals with a working frequency above 20kHz. The ultrasonic transducer mainly includes a shell, a matching layer, a piezoelectric vibrator made of piezoelectric materials, a backing and an outgoing cable. By preparing a high-quality acoustic matching layer, the transmittance of the acoustic energy can be effectively improved, the transition or matching of the acoustic impedance can be realized, the frequency bandwidth of the transducer can be expanded, the distortion can be reduced, and the sensitivity can be improved. Nowadays, in China, the development of relaxor ferroelectric single crystal ultrasonic transducers is relative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K7/28C08K3/22C08K3/36C08K3/34B06B1/06
CPCC08K7/28C08K3/22C08K3/36C08K3/34B06B1/06C08K2003/2244C08K2003/2227C08L63/00
Inventor 罗豪甦肖俊杰刘思杏徐嘉林张章关永港杭海王西安梁柱
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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