研究目的
Developing CaBi4Ti4O15 (CBiT)-based lead-free sol–gel composites for high-temperature ultrasonic transducer application.
研究成果
The study successfully demonstrated the potential of CBiT-based lead-free sol–gel composites for high-temperature ultrasonic transducer application. CBiT/BiT showed superior sensitivity compared to CBiT/BST and CBiT/PZT, despite requiring a higher poling temperature. Further research is recommended to optimize the fabrication process.
研究不足
The study notes the poor film quality of CBiT/BST as a possible cause for its lower sensitivity and suggests that process parameter optimization could improve it. Additionally, the poling difficulty of CBiT/BiT due to the low dielectric constant of BiT is mentioned as a limitation.
1：Experimental Design and Method Selection:
The study involved the development of CBiT-based lead-free sol–gel composites using BST and BiT sol–gel solutions for high-temperature ultrasonic transducer application. The composites were fabricated on titanium substrates using a sol–gel spray technique.
2：Sample Selection and Data Sources:
CBiT powders and BST and BiT sol–gel solutions were prepared. The CBiT powders were custom fabricated, and the BST and BiT sol–gel solutions were prepared according to specific recipes.
3：List of Experimental Equipment and Materials:
The study used a sol–gel spray technique for film fabrication, a ZJ-3B piezo d33 meter for piezoelectric constant measurement, and an electrical furnace for high-temperature testing.
4：Experimental Procedures and Operational Workflow:
The mixtures of CBiT powders and each sol–gel solution were ball-milled, sprayed on titanium substrates, dried, and fired. Poling was performed by corona discharge at high temperatures, and top electrodes were fabricated.
5：Data Analysis Methods:
Ultrasonic responses in the pulse–echo mode were recorded at various temperatures, and the sensitivity and SNR were calculated to evaluate performance.
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