High temperature ultrasonic transducer development by sol-gel composite technique
2023 IEEE International Ultrasonics Symposium (IUS)(2023)
摘要
High temperature ultrasonic transducers have been demanded for some industrial applications, such as process monitoring and structural health monitoring of power/chemical plant. However, there are difficulty to realize such ultrasonic transducers by many reasons, such as space limitation, couplant degradation, complex shapes of monitoring surfaces, backing material degradation/delamination. Ultrasonic transducers made by sol-gel composites could be one of the solutions. The mixture of ferroelectric powders and sol-gel solution is deposited as a film on the target surface, and it becomes porous sol-gel composite film after thermal treatments. Sol-gel composite ultrasonic transducers do not require couplant nor backing material, it could be applied on complex geometry. For sol-gel composite, ferroelectric powder phase material is important, but sol-gel phase material is also important Recently, TiO
2
+SrCO
3
sol-gel phase material has been developed and combined with Bi
4
Ti
3
O
12
and LiNbO
3
powders to realize high temperature ultrasonic transducers. Those sol-gel composites demonstrated superior high temperature performance to existing materials.
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关键词
high temperature,ultrasonic transducer,leadfree,sol-gel composite
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