共查询到20条相似文献,搜索用时 171 毫秒
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3-3型压电复合材料在超声波传感器、水下声学检测等领域有着广泛的应用。锆钛酸铅(PZT)陶瓷通过复合有望制备具有低介电常数、低脆性等优点的复合材料。采用直写成型技术制备了 PZT 三维木堆结构支架, 结合浸渍法填充环氧树脂制备了3-3型PZT/环氧树脂压电复合材料。研究了陶瓷相体积分数对3-3型PZT/环氧树脂压电复合材料的介电、压电、铁电性能的影响,并对比了 PZT陶瓷支架与 PZT/环氧树脂复合材料的介电与压电性能。研究结果表明,随着陶瓷相体积分数的增加,复合材料的介电常数、压电常数及剩余极化强度都会增大, PZT支架具有更大的介电常数、压电常数、压电电压常数;当陶瓷相体积分数为36%时,PZT 支架与 PZT/环氧树脂的压电电压常数分别达到151.0mV·m/N 与104.0mV ·m/N。PZT/环氧树脂复合材料同时具备了压电陶瓷的硬度、电性能,以及聚合物的柔韧性、低密度等优势,其应用前景良好。 相似文献
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研究了钹式压电复合换能器平面均匀串联基阵及并联基阵的等静压压电性能。钹式压电复合换能器平面均匀基阵具有1-3连通型复合结构的性能特点。连接阵元的基体材料是影响换能器基阵的等静压压电性能的关键,基体越柔软实测值与理论值越接近。钹式压电复合换能器平面均匀串联基阵及并联基阵的等效等静压压电常数及等效等静压灵敏值与阵列 单个钹式换能器的相同。 相似文献
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单腔结构压电陶瓷—金属复合体研究 总被引:1,自引:0,他引:1
研制出一种单腔结构压电陶瓷-金属复合体,该复合体不仅压电常数高,而且具有压电常数的位置依赖性小、制作更为简单、便于稳定地安装使用等优点。由实验研究得出了较佳尺寸的复合体,相应的有效压电应变常数为7890pC/N,为其中PZT压电陶瓷压电应变常数的24倍。 相似文献
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压电陶瓷材料的高声阻抗制约着其在水听器和超声成像方面的应用。为了对压电陶瓷材料的声阻抗和声速进行调节,本研究以聚偏氟乙烯(PVDF)及钛酸铅(PT)和锆钛酸铅(PZT)压电陶瓷粉体为原料,经过流延、热压等工艺制得了4种含有不同量PT及PZT的0—3型PZT/PT/PVDF压电复合材料。研究了所制压电复合材料的声学、压电和介电性能。结果表明:所制压电复合材料的声阻抗均小于140 MPa.s/m,最优压电应变常数d33达43 pC/N,相对介电常数为185~210,介质损耗约为2×10–2。 相似文献
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0-3型压电复合材料以其柔软性,易加工成型和制备工艺简单等优点,具有广泛的应用前景.该文利用0-3型压电复合材料作为压电悬臂梁压电振子的压电体,利用Ansys软件对振子做有限元分析,包括静态和模态分析,得出压电振子各参数对其发电能力及谐振频率的影响:振子发电能力与外力及振子的长度成正比,与振子宽度成反比,存在最佳长度比和厚度比;振子的固有频率与长度及质量块的质量成反比,宽度对固有频率的影响较小.这些数据为压电悬臂梁的结构参数提供设计依据. 相似文献
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Morten Willatzen Penglin Gao Johan Christensen Zhong Lin Wang 《Advanced functional materials》2020,30(39)
A quantitative discussion of the combined influence of three electromechanical effects: piezoelectricity, flexoelectricity, and electrostriction in solids is provided for acoustic absorption and gain. While piezoelectricity occurs in non‐centrosymmetric materials only, flexoelectricity and electrostriction exist in all materials. Two important new results are demonstrated: 1) the possibility to realize acoustic gain in all materials (centrosymmetric and non‐centrosymmetric) when the acoustic Cherenkov condition is fulfilled, and 2) realization of acoustic gain in the presence of a strong dc electric field, even when the Cherenkov condition is not fulfilled, in the case of strong cross‐coupling between piezoelectricity, flexoelectricity, and electrostriction. A simple analytical expression for the acoustic dispersion relation is derived for the combined effect of piezoelectricity, flexoelectricity, and electrostriction. At lower frequencies, the piezoelectric effect dominates for inversion‐asymmetric materials. At high frequencies (≈>1 MHz) flexoelectricity becomes increasingly important and eventually provides a major mechanism for gain and absorption in barium titanate (BaTiO3). In the presence of strong electric fields (≈>1 MV m?1), electrostriction provides a dominant isolated contribution to absorption/gain in BaTiO3. Strong coupling between the three electromechanical contributions determines the total absorption/gain coefficient. 相似文献
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苏丹红染料为偶氮类油溶性工业色素,主要用于油彩、汽油、地板蜡等化工品的着色,被国际癌症研究机构(IARC)列为3类致癌物之一.世界各国都已明令禁止将苏丹红应用于食品中,尽快建立一种灵敏、快速、不受样品颜色影响的检测食品中苏丹红的分析检测方法尤为重要.因此,合成人工模拟抗体--苏丹红Ⅰ分子印记聚合物非常有意义.实验在10 μL的压电传感器的金电极上,原位合成苏丹红Ⅰ印迹聚合物.实验结果表明,聚合反应过程是2级反应. 相似文献
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Diffused Phase Transition Boosts Thermal Stability of High‐Performance Lead‐Free Piezoelectrics 下载免费PDF全文
Fang‐Zhou Yao Ke Wang Wook Jo Kyle G. Webber Timothy P. Comyn Jing‐Xuan Ding Ben Xu Li‐Qian Cheng Mu‐Peng Zheng Yu‐Dong Hou Jing‐Feng Li 《Advanced functional materials》2016,26(8):1217-1224
High piezoelectricity of (K,Na)NbO3 (KNN) lead‐free materials benefits from a polymorphic phase transition (PPT) around room temperature, but its temperature sensitivity has been a bottleneck impeding their applications. It is found that good thermal stability can be achieved in CaZrO3‐modified KNN lead‐free piezoceramics, in which the normalized strain d 33* almost keeps constant from room temperature up to 140 °C. In situ synchrotron X‐ray diffraction experiments combined with permitivity measurements disclose the occurrence of a new phase transformation under an electrical field, which extends the transition range between tetragonal and orthorhombic phases. It is revealed that such an electrically enhanced diffused PPT contributed to the boosted thermal stability of KNN‐based lead‐free piezoceramics with high piezoelectricity. The present approach based on phase engineering should also be effective in endowing other lead‐free piezoelectrics with high piezoelectricity and good temperature stability. 相似文献
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