共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
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
5.
6.
7.
1-3复合材料作为敏感元件已经被广为研究,但作为一种激励元件的研究极为有限。利用有限元原理研究一种1-3型压电复合材料。这种材料中,PZT-5H压电陶瓷作为单元支梁,聚合物作为这种压电陶瓷周围的填充基体。通过改变PZT-5H在这种材料中的体积比率,再经过谐响应分析,可以得到一种具有最高的机电耦合特性的结构。为了简化有限元建模的复杂程度和缩短计算时间,将这种1-3型复合材料等价为单一相的材料,并加以验证。这种新型的1-3型压电复合材料作为前沿技术可以用在半导体封装领域键合机的换能器上。 相似文献
8.
多元纳米压敏陶瓷粉体的sol-gel合成与表征 总被引:3,自引:0,他引:3
为了避免单体纳米粉体的易团聚、难以分散混合均匀的缺点,为了避免化学共沉淀方法中微量添加剂易流失、成分难以精确控制的缺点,本文设计采用溶胶-凝胶方法制备多元纳米压敏陶瓷粉体材料。通过用溶胶-凝胶方法制备多元纳米压敏陶瓷粉体的研究和对多元纳米压敏陶瓷粉体的表征,得到以下主要结果:用金属醇盐和无机盐为原料,经过醇解和水解反应,形成溶胶,经过胶凝以及热分解制备多元纳米压敏陶瓷粉体的工艺技术路线是可行的。通过工艺控制可以得到粒子形状为近似球形,粒度分布范围窄,成分均匀分布、平均粒径为20 nm的多元纳米压敏陶瓷粉体。与传统方法制备的多元微米压敏陶瓷粉体相比较,多元纳米压敏陶瓷粉体的比表面积为334 m2/g,是多元微米压敏粉体比表面积的37.4倍。 相似文献
9.
1-3型压电复合材料是一种新型的结构压电材料,它具有普通压电材料(如单晶、陶瓷或聚合物)无法同时实现的强机电耦合和低声阻抗特性。对1-3型压电复合材料的性能、制作工艺、有关的理论及应用作了简述。 相似文献
10.
11.
Jiaqi Zheng Shuang Sun Xu Hu Zhaohan Yu Yue Fu Dan Chen Dong Wang Weihao Cai Huamin Zhou Yunming Wang 《Advanced functional materials》2023,33(15):2213343
High-performance damping materials are significant toward reducing vibration and maintaining stability for industrial applications. Herein, a yolk–shell piezoelectric damping mechanism is reported, which can enhance mechanical energy dissipation and improve damping capability. With the addition of yolk–shell particles and carbon nanotube (CNT) conductive network, damping properties of various resin matrices are enhanced with the energy dissipation path of mechanical to electrical to heat energy. Particularly, the peak loss factor of epoxy composites reaches 1.91 and tan δ area increases by 25.72% at 20 °C. The results prove the general applicability of yolk–shell piezoelectric damping mechanism. Besides, the novel damping materials also exhibit excellent flexibility, stretchability, and resilience, offering a promising application toward damping coating, indicating broad scope of application in transportation and sophisticated electronics, etc. 相似文献
12.
Fleming A.J. Behrens S. Reza Moheimani S.O. 《Mechatronics, IEEE/ASME Transactions on》2002,7(1):87-94
Piezoelectric transducer (PZT) patches can be attached to a structure in order to reduce vibration. The PZT patches essentially convert vibrational mechanical energy into electrical energy. The electrical energy can be dissipated via an electrical impedance. Currently, impedance designs require experimental tuning of resistive circuit elements to provide optimal performance. A systematic method is presented for determining the resistance values by minimizing the H2 norm of the damped system. After the design process, shunt circuits are normally implemented using discrete resistors, virtual inductors and Riordian gyrators. The difficulty in constructing the shunt circuits and achieving reasonable performance has been an ongoing and unaddressed problem in shunt damping. A new approach to implementing piezoelectric shunt circuits is presented. A synthetic impedance, consisting of a voltage controlled current source and a digital signal processor system, is used to synthesize the terminal impedance of a shunt network. A two-mode shunt circuit is designed and implemented for an experimental simply supported beam. The second and third structural modes of the beam are reduced in magnitude by 22 and 18 dB 相似文献
13.
T型压电变摩擦阻尼器性能试验与分析 总被引:2,自引:0,他引:2
结合压电陶瓷驱动器和T型金属摩擦阻尼器的特点,提出了T型压电变摩擦阻尼器及其三种阻尼力模型。其次,设计并制作了最大阻尼力450N、阻尼力可调倍数2.5~3倍的T型压电变摩擦阻尼器模型,并进行了可调阻尼力性能实验,得到了输入电压分别为常电压、位移和速度相关形变电压的阻尼力滞回曲线,试验结果与理论分析较吻合。 相似文献
14.
15.
Yuanzheng Zhang Mengjun Wu Quanyong Zhu Feiyu Wang Huanxin Su Hui Li Chunli Diao Haiwu Zheng Yonghui Wu Zhong Lin Wang 《Advanced functional materials》2019,29(42)
With the rapid development of the Internet of things (IoT), flexible piezoelectric nanogenerators (PENG) have attracted extensive attention for harvesting environmental mechanical energy to power electronics and nanosystems. Herein, porous piezoelectric fillers with samarium/titanium‐doped BiFeO3 (BFO) are prepared by a freeze‐drying method, and then silicone rubber is filled into the microvoids of the piezoelectric ceramics, forming a unique structure based on silicone rubber matrix with uniformly distributed piezoelectric ceramic. When subjected to external force stimulation, compared with conventional piezocomposite films found on undoped BFO without a porous structure, the PENG possesses higher stress transfer ability and thus boosts output performance. The notable enhancement in the stress transfer ability and piezoelectric potential is proven by COMSOL simulations. The PENG can exhibit a maximum open‐circuit voltage (Voc) of 16 V and short‐circuit current (Isc) of 2.8 µA, which is 5.3 and 5.6 times higher than those of conventional piezocomposite films, respectively. The PENG can be used as a triggering signal to control the operation of fire extinguishers and household appliances. This work not only expands the application scope of lead‐free piezoelectric ceramic for energy harvesting, but also provides a novel solution for self‐powered mechanosensation and shows great potential application in IoT. 相似文献
16.
On low-frequency electric power generation with PZT ceramics 总被引:3,自引:0,他引:3
S.R. Platt S. Farritor H. Haider 《Mechatronics, IEEE/ASME Transactions on》2005,10(2):240-252
Piezoelectric materials have long been used as sensors and actuators, however their use as electrical generators is less established. A piezoelectric power generator has great potential for some remote applications such as in vivo sensors, embedded MEMS devices, and distributed networking. Such materials are capable of converting mechanical energy into electrical energy, but developing piezoelectric generators is challenging because of their poor source characteristics (high voltage, low current, high impedance) and relatively low power output. In the past these challenges have limited the development and application of piezoelectric generators, but the recent advent of extremely low power electrical and mechanical devices (e.g., MEMS) make such generators attractive. This paper presents a theoretical analysis of piezoelectric power generation that is verified with simulation and experimental results. Several important considerations in designing such generators are explored, including parameter identification, load matching, form factors, efficiency, longevity, energy conversion and energy storage. Finally, an application of this analysis is presented where electrical energy is generated inside a prototype Total Knee Replacement (TKR) implant. 相似文献
17.
The effect of resonant acoustic wave excitation in semi-insulating gallium-arsenide single crystals is investigated by means
of light pulses. The peak amplitude of excited elastic oscillations is observed in a temperature range, where small values
of the internal friction and electrical conductivity of the semiconductor take place simultaneously. The effect is related
to the inverse piezoelectric conversion of the bulk-photovoltage energy into the mechanical deformation of the semiconductor
crystal. The results of the investigations can be used for designing semiconductor photodetectors with high modulation-frequency
selectivity. 相似文献
18.
Ying Hong Biao Wang Zhihe Long Zhuomin Zhang Qiqi Pan Shiyuan Liu Xiaowei Luo Zhengbao Yang 《Advanced functional materials》2021,31(42):2104737
Softening of piezoelectric materials facilitates the development of flexible wearables and energy harvesting devices. However, as one of the most competitive candidates, piezoelectric ceramic-polymer composites inevitably exhibit reduced power-generation capability and weak mechanical strength due to the mismatch of strength and permittivity between the two phases inside. Herein a flexible, air-permeable, and high-performance piezoceramic textile composite with a mechanically reinforced hierarchical porous structure is introduced. Based on a template-assisted sol-gel method, a three-order hierarchical ceramic textile is constructed by intertwining submillimeter-scale multi-ply ceramic fibers that are further formed by twisting micrometer-scale one-ply ceramic fibrils. Theoretical analysis indicates that large mechanical stress can be easily induced in the multi-order hierarchical structure, which greatly benefits the electrical output. Fabricated samples generate an open-circuit voltage of 128 V, a short-circuit current of 120 µA, and an instantaneous power density of 0.75 mW cm−2, much higher than the previously reported works. The developed multi-order and 3D-interconnected piezoceramic textile shows satisfactory piezoelectricity (d33 of 190 pm V−1), air permeability (45.1 mm s−1), flexibility (Young's modulus of 0.35 GPa), and toughness (0.125 MJ m−3), collectively. The design strategy of obtaining balanced properties promotes the practicality of smart/functional materials in wearables and flexible electronics. 相似文献
19.
Jingen Wu Huaduo Shi Tianlong Zhao Yang Yu Shuxiang Dong 《Advanced functional materials》2016,26(39):7186-7194
Conventionally, effective mechanical vibration energy harvesting is based on (Pb,Zr)TiO3 (PZT) ceramics, poly(vinylidene fluoride) (PVDF) polymers or PVDF/PZT or other piezoelectric composite materials, and their working temperature is normally limited to room temperature (R‐T) or below 150 °C. Here, bismuth scandium lead titanate (BiScO3‐PbTiO3, abbreviated as BSPT) ceramic is reported which has a high Curie temperature point around 450 °C and its application for high‐temperature (H‐T) vibration energy harvesting. Experimental results show that it exhibits an excellent H‐T piezoelectricity, converting mechanical vibration energy into electric power effectively in a wide temperature range from R‐T till 250 °C. This research shows the BSPT piezoelectric energy harvester having the potential application for self‐power source of wireless sensor network system in high temperature circumstance. 相似文献