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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Super-Cell Piezoelectric Composite With 1–3 Connectivity
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Super-Cell Piezoelectric Composite With 1–3 Connectivity

机译：具有1-3连接性的超级电池压电复合材料

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摘要

The standard fabrication method for 1–3 piezocomposites for ultrasound transducers is the “dice and fill” method (DFM) in which lateral periodicity is introduced. This contributes to the appearance of spurious modes that can drastically affect the performance of the device if they appear near its thickness mode frequency, thus limiting the effective frequency range. A new 1–3 piezocomposite fabricated with a super-cell structure [1–3 super cell (13SC)] was designed in order to overcome these limitations. It consists of the merging of several periodic cells with 47% PZT volume fraction and epoxy resin as the matrix. Two lateral periodicities in one direction are defined as well as two different kerfs. The chosen cell shape is composed of five nonaligned square section rods ( 1×1 mm 2 ). For comparison of performance, two regular 1–3 piezocomposites (the same materials and equivalent periodicities) were fabricated by DFM. Electroacoustic responses in water were measured for the three composites being considered as transducers. Successive regular thinnings (from 2.8 to 1.1 mm) were carried out for each sample to increase the operating frequency (from around 0.4 to 1.3 MHz) and study the evolution of the characteristics (bandwidth and sensitivity). The experimental results confirmed the behavior of those obtained with numerical simulations, showing that the 13SC composite can be used in this entire frequency range, unlike regular composites.
机译：用于超声换能器的1-3压电复合材料的标准制造方法是引入横向周期性的“骰子和填充”方法（DFM）。这会导致出现杂散模式，如果杂散模式出现在其厚度模式频率附近，则会严重影响设备的性能，从而限制了有效频率范围。为了克服这些局限性，设计了一种新的具有超级单元结构的1-3压电复合材料[1-3超级单元（13SC）]。它由PZT体积分数为47％的几个周期单元合并而成，并以环氧树脂为基质。定义了一个方向上的两个横向周期性以及两个不同的切口。选择的像元形状由5个未对齐的方形截面棒（1×1 mm 2）组成。为了比较性能，DFM制造了两种规则的1-3压电复合材料（相同的材料和等效的周期性）。测量了三种被认为是传感器的复合材料在水中的电声响应。对每个样品进行了连续的定期减薄（从2.8到1.1毫米）以增加工作频率（从0.4到1.3 MHz左右）并研究特性（带宽和灵敏度）的演变。实验结果证实了通过数值模拟获得的性能，表明13SC复合材料可以在整个频率范围内使用，这与常规复合材料不同。

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