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以传统铁电陶瓷PZT-5a为原材料,通过线切割-填充法制备1-3型复合材料,重点研究了20℃到120℃升温过程中复合材料的介电、弹性、压电以及损耗特性,并分析了温度对参数影响的机理。结果表明相对介电常数、介电损耗、厚度机电耦合系数,机械损耗均会随着温度的升高而升高,介电损耗与机械损耗变化较为复杂,材料的谐振频率,声阻抗,弹性刚度系数会随着温度的升高而降低。这将为优化高温超声换能器的设计,提高其工作效率和特性,拓展在工业无损检测、水下声纳、生物医学以及工业处理等领域的应用,提供理论基础和技术支持。
The traditional ferroelectric ceramic PZT-5a was used as the raw material to prepare the 1-3 composite by wire cutting-filling method. The dielectric, elastic, piezoelectric and loss characteristics of the composites were investigated emphatically during the heating process from 20 ℃ to 120 ℃. The mechanism of the influence of temperature on the parameters is also analyzed. The results show that the relative permittivity, the dielectric loss, the thickness of the electromechanical coupling coefficient and the mechanical loss all increase with the increase of the temperature. The dielectric loss and mechanical loss change are more complicated. The resonant frequency, acoustic impedance, elastic stiffness The coefficient decreases as the temperature increases. This will provide the theoretical basis and technical support for optimizing the design of high temperature ultrasonic transducers, improving their work efficiency and characteristics, and expanding their applications in industrial nondestructive testing, underwater sonar, biomedical and industrial processing fields.