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电泳沉积法制备PZT厚膜及其性能 总被引:2,自引:0,他引:2
用电泳沉积技术制备了约70μm的PZT[Pb(Zr_(0.52)Ti_(0.48))O3]厚膜,分析了zeta电位、粘度及电泳沉积速率对PZT悬浮液的稳定性和电泳沉积质量的影响,并研究了烧结后PZT厚膜的结构和电学性能。实验结果表明:在pH=5.5~6.5时,悬浮液的zeta电位高达50 mV以上,此时悬浮液分散性好、粘度低,有最佳的沉积速率(≈31mg·cm~(-2)·min~(-1))和高达51%的相对沉积密度。在此条件下制备出的PZT膜厚均匀一致,无裂纹,经1 000℃保持30min烧结后,在1 kHz下测量得PZT厚膜的介电常数为1 050,介电损耗约为0.05,饱和极化值为20μC/cm~2,剩余极化值为12.9 μC/cm~2,矫顽场强为10.5 kV/cm。 相似文献
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研究了羟基磷灰石粉体粒径、粉体预烧温度、陈化时间、分散溶剂、悬浮液固含量对羟基磷灰石悬浮液稳定性的影响,通过测定Zeta电位,吸光度等参数表征悬浮液稳定性,对悬浮液电泳沉积的涂层进行SEM表面形貌及粘结-拉伸结合强度的表征.结果表明:悬浮液颗粒越小,Zeta电位越高;对羟基磷灰石粉体预烧800℃,Zeta电位明显提高,且有利于涂层与基体的结合;悬浮液陈化48 h后,颗粒荷电性最佳,可得致密均匀的涂层;以乙二醇为分散溶剂可制备稳定的悬浮液,但乙醇溶剂更有利于涂层的电泳沉积;悬浮液固含量控制为20g/L时,涂层质量较好. 相似文献
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本文采用传统的固相法制备PZT二元系压电陶瓷。研究了掺杂不同含量为0.1%,0.15%,0.2%,0.25%,0.3%和0.35%的MnO_2和CeO_2对PZT压电陶瓷的结构、介电性能、压电性能和介电损耗的影响。并对其微观组织进行了研究。当锰的掺杂量为0.15%时,压电陶瓷的性能得到最佳的优化:tgδ=0.0095;kp=0.634p C/N;d33=611;ε=2523。铈的掺杂使陶瓷的烧结温度升高,当铈的掺杂量为0.15%时,压电陶瓷的性能也得到了最佳的优化:tgδ=0.017;kp=0.623;d33=563p C/N,ε=3310。在原配方材料的基础上压电常数和机电耦合系数都有所增加。这对压电报警器的声压的提高、体积的减小有着重要的意义。 相似文献
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以溶胶-自燃烧法合成PZT为基制备PMZN压电陶瓷 总被引:1,自引:0,他引:1
以硝酸锆为锆源,采用溶胶-自燃烧法在700℃的热处理温度下合成出具有单一钙钛矿结构的PZT粉料.采用溶胶-自燃烧法合成的PZT为基料,在1050℃制备出PMZN陶瓷.采用XRD,SEM研究了PMZN陶瓷的结构,并测量了其介电性能和压电性能.结果表明:PMZN陶瓷为四方钙钛矿结构,其主要电学性能指标为:Kp为0.54,Qm为1073,tgδ小于或等于0.001,ε33=1236,d33=454pC/N,f s为136.1kHz.与以常规固相反应法合成PZT为基料的PMZN陶瓷相比,以溶胶-自燃烧法合成PZT为基料的PMZN陶瓷的烧结温度较低,而且综合电学性能更为优良. 相似文献
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电泳沉积原理及其在陶瓷制备中的应用 总被引:4,自引:0,他引:4
本文介绍了电泳沉积(EPD)的原理,从胶体悬浮体系的DLVO经典静电稳定理论出发讨论了EPD的机理,综述了国外关于电泳沉积应用于陶瓷(包括传统瓷、技术瓷、超导瓷、生物瓷和复合瓷)坯体直接成型的研究进展。 相似文献
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以氧化铝溶胶为前驱体,采用电泳沉积和低温煅烧法在低碳钢基体上制备了氧化铝陶瓷涂层,并对其成分、表面形貌及耐蚀性进行了研究。结果表明,将低碳钢片置于以乙醇作为分散介质的0.45mol/L氧化铝溶胶中,在60V恒电位下沉积180s后,再于马弗炉中700°C下煅烧5min,所制得的氧化铝陶瓷涂层在2mol/L盐酸溶液中具有良好的耐蚀性。 相似文献
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The effects of powder washing on the colloidal stability and electrophoretic deposition rate of 3-mol%-Y2 O3 -doped tetragonal-ZrO2 powder from ethanol suspensions are shown experimentally. Simultaneous acoustic and electroacoustic measurements make it possible to determine independently particle size and zeta-potential in concentrated ethanol suspension. It is suggested that ionic (Na+ ) surface contamination, which is reduced by laundering cycles, is the cause of the low zeta-potential and deposition rate of the as-received powder. 相似文献
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添加剂对锆钛酸铅二元系压电陶瓷性能的影响 总被引:4,自引:0,他引:4
诸爱珍 《陶瓷研究与职业教育》2005,3(1):46-48
对添加剂按电价进行了分类,讨论了各类添加剂对锫钛酸铅二元系压电陶瓷性能的影响,分析了各类添加剂能对锆钛酸铅二元系压电陶瓷进行改性的原因。研究表明各种添加剂的加入量都有一个适宜的范围。 相似文献
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为了研究压电陶瓷颗粒对结构陶瓷力学性能的影响,把不同的压电陶瓷 颗粒加入到Al2O3结构陶瓷,发现LiTaO3与Al2O3在烧结时能稳定共存,烧结温度高于1400℃时,LiTaO3发生化,冷却后呈网状分布在AlO3基体晶界;低于1400℃烧结,LiTaO3颗粒弥散分布在Al2O3基体中,采用200MPa冷等静压成型,1300℃(保温3小时)空气气氛下无压烧结,最后于1300℃,150MPa(保温保压1h)氩气气氛下热等静压制备了LiTaO3/Al2O3陶瓷复合材料,对其显微结构与力学性能进行了研究,结果表明,LiTaO3体积分数为5%的陶瓷复合材料具有最高的抗弯强度与断裂韧性值,分别达到438.7MPa和5.4MPa.m^1/2,电畴运动和/或压电 应引起的能量耗散是一种新的陶瓷强韧化机制。 相似文献
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Fabrication of Piezoelectric Ceramic/Polymer Composite Transducers Using Fused Deposition of Ceramics 总被引:2,自引:0,他引:2
Gwenaëlle M. Lous Iván A. Cornejo Thomas F. McNulty Ahmad Safari Stephen C. Danforth 《Journal of the American Ceramic Society》2000,83(1):124-28
The fused deposition of ceramics (FDC) technique was used to fabricate piezoelectric ceramic skeletons for the development of piezoelectric composite transducers with 2–2 connectivity for medical imaging. The green parts were designed to have 30 vol% lead zirconate titanate ceramic (PZT-5H) in the final composites. Physical characterization of the sintered samples revealed that 96% of the theoretical density was achieved. Optical microscopy showed that defects due to the FDC mode of deposition, such as small roads and bubbles, were eliminated, because of improvements in powder processing. The electromechanical properties of the final composites were similar to the properties that were obtained for conventionally made composites. A matching layer and a backing layer, as well as wires and an inductor, were added to each FDC composite to fabricate a functional medical imaging transducer. The devices were tested in water using a steel target 3.5 cm thick. Echoes from the target could be detected with all the transducers that were fabricated using FDC. The sensitivities of the transducers were similar to that of a commercial transducer. However, the ringing was much longer than that for a commercial transducer, because the backing layer was not optimized in the transducers that were fabricated using FDC. 相似文献
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