Large Bandwidth and High Sensitivity Ultrasonic Transducers Based on High Temperature 1-3 Piezoelectric Composite Materials

Le résumé fourni par la source

High-temperature Pb(Zr,Ti)O₃ (PZT)/epoxy 1-3 composites were fabricated using the dice-and-fill technique. These composites exhibited dielectric permittivity (890), piezoelectric coefficient (450 pC/N), and electromechanical coupling coefficient kt (62%) at room temperature. To enhance thermal reliability at elevated temperatures, the epoxy filler was incorporated with glass microspheres, which helped modify the thermal expansion behavior of the filler. The temperature-dependent dielectric and electromechanical properties of the composites were characterized to verify the improved thermal reliability. At elevated temperatures, utilizing 1-3 piezoelectric composite materials improved sensitivity and bandwidth of ultrasonic transducer.

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