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Piezoelectric composites with high sensitivity and high capacitance for use at high pressures

机译:高压下具有高灵敏度和高电容的压电复合材料

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A type of piezoelectric composite has been developed for oceanographic applications. The composites have a large figure of merit (d/sub h/*g/sub h/ or d/sub h/*g/sub h//tan delta , where d/sub h/ is the hydrostatic piezoelectric voltage coefficient), a large dielectric constant (K) and low dielectric loss, and great mechanical strength. A shallow cavity between the PZT ceramics and thick metallic electrode is designed to convert a portion of the z-direction stress into a large radial and tangential stress of opposite sign. thereby causing the d/sub 33/ and d/sub 31/ contributions to d/sub h/ to add rather than subtract, and raising the figure of merit. Theoretical stress analysis was carried out using an axisymmetric finite element method. Experimental results show that the d/sub h/*g/sub h/, K, and withstandable pressure are extremely high.
机译:已经开发出一种用于海洋学应用的压电复合材料。复合材料具有较大的品质因数(d / sub h / * g / sub h /或d / sub h / * g / sub h // tanδ,其中d / sub h /是静水压电电压系数),介电常数(K)大,介电损耗低,机械强度高。 PZT陶瓷和厚金属电极之间的浅腔设计用于将z方向应力的一部分转换为符号相反的大径向和切向应力。从而使d / sub 33 /和d / sub 31 /对d / sub h /的贡献增加而不是减少,从而提高了品质因数。理论应力分析是使用轴对称有限元方法进行的。实验结果表明,d / sub h / * g / sub h /,K和承受压力极高。

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