High-Frequency 0.36BiScO₃-0.64PbTiO₃ Ultrasonic Transducer for High-Temperature Imaging Application

Piezoelectric materials are essential for ultrasonic transducers, especially in high-temperature environments. Prior research has shown that conventional materials lose performance above 200 °C. This gap motivated the search for materials with stable piezoelectric properties at elevated temperatures. The morphotropic phase boundary in certain ceramics offers enhanced performance. However, no prior work had resolved the long-term stability of these materials in practical imaging. The need for reliable transducers in extreme conditions remains unmet. This paper contributes by evaluating a specific ceramic composition for high-temperature use. The study focuses on its resonance and imaging capabilities. The findings aim to address the limitations of existing transducers in high-temperature applications.

The goal was to assess the suitability of 0.36BiScO3-0.64PbTiO3 (BS-PT) ceramics for high-temperature ultrasonic transducers. The researchers aimed to determine if this material could maintain stable resonance and imaging performance at elevated temperatures. They designed a transducer based on this ceramic and tested it in controlled conditions. The study focused on resonance stability and echo response at different temperatures. The transducer was evaluated in a silicone oil bath to simulate real-world environments. The researchers also aimed to calculate axial resolution and oil velocity for imaging accuracy. The ultimate objective was to verify the material's potential for high-temperature imaging. This study provides a foundation for future transducer development in extreme conditions.

The researchers used (1-x)BiScO3-xPbTiO3 ceramics at the morphotropic phase boundary (x = 0.64). They characterized the electric properties of 0.36BS-0.64PT ceramics at varying temperatures. A 15 MHz ultrasonic transducer was designed using PiezoCAD software. The transducer was tested in a silicone oil bath at different temperatures. Resonance stability was measured up to 290 °C. Echo response was evaluated at temperatures up to 250 °C. Axial resolution and oil velocity were calculated from the test data. The transducer was used to image a stepped metal block in silicone oil at 250 °C.

The transducer maintained stable electrical resonance until 290 °C. A clear echo response was observed until 250 °C with minimal frequency shifts. The center frequency changed slightly but remained within acceptable limits. The transducer successfully imaged a stepped metal block at 250 °C. Axial resolution and oil velocity were calculated at various temperatures. The material retained its piezoelectric properties at high temperatures. The test results confirmed the transducer's stability in extreme conditions. The HTUT demonstrated consistent performance in both resonance and imaging tasks.

The study verified the capability of 0.36BS-0.64PT ceramics for high-temperature ultrasonic imaging. The transducer maintained resonance stability up to 290 °C and produced clear images at 250 °C. The slight frequency changes did not affect overall performance. The material's properties at the morphotropic phase boundary support its use in HTUTs. The transducer's imaging results in silicone oil confirm its practical application. The researchers propose that this material is suitable for extreme environments. The findings suggest potential for industrial and scientific imaging at high temperatures. The study supports further development of HTUTs using this ceramic composition.