共查询到19条相似文献,搜索用时 496 毫秒
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Na0.5K0.5NbO3无铅压电陶瓷具有优异的压电性能,是最有希望取代含铅PZT系压电陶瓷的体系之一,但烧结特性差,难以获得高致密度的陶瓷体是制约其研究发展的关键问题。基于近年来有关Na0.5K0.5NbO3无铅压电陶瓷的报道,重点从热压烧结法、放电等离子烧结法、添加烧结助剂法以及添加第二组元促进烧结法四个方面,综述了其在烧结制备技术上取得的研究新进展,并对Na0.5K0.5NbO3无铅压电陶瓷烧结制备技术今后的发展方向提出了一些建议。 相似文献
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研究了SrBi Ti O 无铅压电陶瓷的制备工艺,确定 900℃为合成温度,在 1100℃烧结。对烧结后的 4 4 15样品进行性能测试,SrBi Ti O 无铅压电陶瓷的压电常数为10Pc/N,需要有一些制备方法来提高其在某一方向的 44 1 5压电性能。 相似文献
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以微波水热法制备的KNN粉体为原料,添加1mol%ZnO、1mol%CuO烧结助剂,采用传统电子陶瓷制备方法,研究了烧结助剂对KNN陶瓷的陶瓷体积密度、显微结构和电性能的影响,结果表明:添加烧结助剂ZnO和CuO可以降低KNN陶瓷的烧结温度,提高KNN陶瓷的体积密度;与此同时,ZnO和CuO添加后降低了KNN无铅压电陶瓷的压电常数d33、介电常数ε33T/ε0,但机械品质因数Qm得到很大的提高,介电损耗tanδ明显降低。其中CuO烧结助剂可以使KNN陶瓷的d33由142 pC/N降低至118 pC/N,Qm值由82提高至427,tanδ由2.46%降低至0.64%。 相似文献
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烧结工艺直接影响陶瓷的显微结构及性能。利用超快速高温工艺制备钛酸钡压电陶瓷,并与常规烧结工艺制备的钛酸钡陶瓷进行对比。研究了超快速高温烧结电流对钛酸钡陶瓷组成、结构以及性能的影响。结果表明:超快速高温烧结可以抑制晶粒的生长,采用超快速高温烧结工艺在电流为180 A保温5 min后,钛酸钡陶瓷的室温相对介电常数为3 450、介电损耗为1.89%、压电常数为283 p C·N–1,这些性能均与常规烧结钛酸钡性能相当,超快速高温整个烧结时间较常规工艺缩短了196倍,是一种新型高效功能陶瓷烧结方法。 相似文献
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本文研究了PMN -PZN -PFW -PZT多元系统低温烧结压电陶瓷 ,并讨论了钙钛矿相的合成方法以及添加剂对压电陶瓷性能的影响。 相似文献
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无铅压电陶瓷制备方法的研究进展 总被引:1,自引:0,他引:1
无铅压电陶瓷的开发和应用已经成为各个国家的研究热点。本文从粉体制备方法和晶粒定向生长技术两个方面综述了近几年无铅压电陶瓷主要制备方法(如溶胶-凝胶法、水热法、熔盐法、热处理技术等)的研究进展,最后对其今后的发展方向做出了展望。 相似文献
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介绍铁电、压电等功能陶瓷及其片式元件应用研究的若干新进展.基于过渡液相烧结机制的高性能压电陶瓷材料具有低烧结温度、高压电常数和低介质损耗等诸多优点.低烧多层压电变压器(MPT)以其低驱动电压、小体积、高升压比、薄型片式化等优点在液晶显示背光电源等方面获得应用.多层压电变压器及其背光电源具有高功率密度、高转换效率、薄型化和低成本等特点.基于缺陷化学原理和无晶粒长大的致密化烧结动力学,制备了亚微米/纳米晶钛酸钡基陶瓷及其薄层化贱金属内电极MLCC.研制了低烧铁氧体材料及其片式电感器.介绍了压电陶瓷超声微马达的结构与特性. 相似文献
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Commercial lead zirconate titanate (PZT) perovskite powders were used to fabricate ceramic tape and then sintered by microwave and conventional methods. Both dielectric and piezoelectric properties of PZT ceramic tapes were studied in terms of sintering process. X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) show the PZT perovskite phase with smaller grain size and dense microstructure can be obtained at a lower sintering temperature by microwave process. It was also observed that shrinkage ratio and bulk density of the tapes sintered at 800 °C were obtained about 19% and 7.46 g/cm3 by the microwave heating method, respectively, that is corresponding to those values of sintered PZT tapes at 950 °C by conventional process. Moreover, the dielectric constant and maximum permittivity are increased about 30% as compared with conventional processing method. The experimental results demonstrated that the characteristics of the PZT tapes could be significantly improved by microwave heating method. These results demonstrate that such a simple approach can upswing the piezoelectric and dielectric properties of these tapes by using microwave process with a short heating time. 相似文献
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Enling Tang Yue Li Ruizhi Wang Yafei Han 《International Journal of Applied Ceramic Technology》2019,16(4):1639-1650
To verify feasibility of piezoelectric ceramic activating micro-sized thermochemical batteries, it is very necessary to disclose shock pressure and electric output performances of piezoelectric ceramic. In order to simulate piezoelectric ceramic activating micro-sized thermochemical batteries in the bore, shock pressure, and electronic output testing systems for piezoelectric ceramic have been established. And the piezoelectric ceramics composite structural targets are impacted using one-stage light gas gun to load projectile, which is used to simulate the overload of the projectile with piezoelectric ceramics during projectile launching process, and combining with the experimental tests of a military 3# electric fuse head as a firing component in series. In experiments, the composite structural targets (front steel substrate-piezoelectric ceramic-rear steel substrate) are vertically impacted by the cylindrical 2A12 aluminum projectiles. The change rules of shock pressure, output voltage, and current peak values for piezoelectric ceramics are obtained at the different experimental parameters, and the firing conditions of piezoelectric ceramic igniting the military 3# electric fuse heads and ignition paper are presented. 相似文献