PZT-PNN-PZN四元系压电陶瓷的低温烧结与性能研究

发布时间：2018-03-06 22:05

本文选题：低温烧结　切入点：压电陶瓷　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,多层压电器件已广泛研究用于器件的整机一体化、小型化、复合化和高性能。为了用更便宜的金属电极如纯Ag或高Ag/低Pd实现多层压电陶瓷的共烧,降低烧结温度是必要的。因此,低温烧结压电陶瓷对制备廉价的多层压电器件十分重要。本文通过非化学计量、添加CuO为烧结助剂、增加组元的方法来降低压电陶瓷的烧结温度,研究其对PZT-PNN-PZN四元系压电陶瓷材料的烧结温度、微观形貌、烧结密度、介电和压电性能的影响。首先,采用一次合成法制备了PZT-PNN-PZN四元系压电陶瓷,在PZT-PNN-PZN四元系压电陶瓷中添加Pb_3O_4、NiO、ZnO,改变组分的非化学计量,研究了不同的Pb_3O_4、NiO、ZnO含量对于PZT-PNN-PZN四元系压电陶瓷的烧结特性和电性能的影响。实验结果表明:Pb_3O_4、NiO、ZnO的加入没有改变基体材料的晶体结构,同时在烧结过程中形成了液相,促进烧结致密化并降低了烧结温度。但Pb_3O_4、NiO、ZnO的加入恶化了样品的性能。采用分步合成法,1mol%N iO过量的样品在950°C下烧结4h后,其压电常数d33、介电损耗tanδ、相对介电常数ε_33~T/ε0分别为:337pc/N,2.1%,2311。同时,还研究了在二次合成前后加入NiO对于样品的烧结特性以及性能的影响,结果表明在合成后加入NiO样品烧结后的致密度更大,性能也比较优良。采用非化学计量能降低压电陶瓷的烧结温度,但严重恶化了压电和介电性能。其次,为了使陶瓷具有较低的烧结温度并同时具有优良的压电性能,采用最常见的烧结助剂CuO来实现。实验结果表明,CuO的加入没有改变基体的主晶相结构,同时能够明显提高材料的致密度。1mol%CuO掺杂的样品在950°C下烧结4h的压电常数d33、介电损耗tanδ、相对介电常数ε_33~T/ε0分别为:411pc/N,1.86%,2449,具有一定的应用潜力。C uO的添加能有效降低陶瓷的烧结温度,也能得到相对优良的压电和介电性能。最后,引入钙钛矿结构组元PFW作为烧结助剂,采用分步合成法制备(a-x)Pb(Zr_(0.48)Ti_(0.52))O_3-bPb(i_(1/3)Nb_(2/3))O_3-c Pb(Zn_(1/3) Nb_(2/3))O_3-xPb(Fe_(2/3)W_(1/3))O_3(a+b+c+x=1,0.06≤x≤0.10)陶瓷,研究了PFW含量对致密度、微观形貌、相结构、介电和压电性能,PFW的掺杂使材料的烧结温度从1180°C降低到940°C,PFW的添加增加了PFW-PNN-PZN-PZT陶瓷的烧结致密度和平均晶粒尺寸,当x=0.08时陶瓷在940°C烧结4h具有优良的性能:d33=496pC/N,ε_33~T/ε0=3119,tanδ=2.1%,and Tc=242°C。这些数值表明此新组成适用于多层压电器件。
[Abstract]:In recent years, multilayer laminated electrical devices have been widely studied for the integration, miniaturization, compounding and high performance of the devices. In order to realize the co-firing of multilayer piezoelectric ceramics with cheaper metal electrodes such as pure Ag or high Ag/ low PD, It is necessary to reduce the sintering temperature. Therefore, low temperature sintering piezoelectric ceramics is very important for the preparation of cheap multilayer laminated electrical parts. In this paper, CuO is added as sintering assistant by non-stoichiometric method. To reduce the sintering temperature of piezoelectric ceramics by adding components, the effects of the sintering temperature, microstructure, sintering density, dielectric and piezoelectric properties of PZT-PNN-PZN quaternary piezoelectric ceramics were studied. PZT-PNN-PZN quaternary piezoelectric ceramics were prepared by a single synthesis method. PbS3 O4 / NiOZnO was added to PZT-PNN-PZN quaternionic piezoelectric ceramics to change the non-stoichiometry of the components. The effect of different content of Pb3O _ 4NiOO _ (ZnO) on the sintering properties and electrical properties of PZT-PNN-PZN quaternary piezoelectric ceramics was studied. The experimental results show that the addition of PZT-PNN-PZN _ (3) O _ (4) O _ (4) NiOO _ (PZT-PNN-PZN) does not change the crystal structure of the substrate, and a liquid phase is formed during the sintering process. The sintering densification was promoted and the sintering temperature was lowered. However, the addition of PB3O4NiOO ZnO deteriorated the properties of the samples. The piezoelectric constant d33, dielectric loss tan 未, relative dielectric constant 蔚 33T / 蔚 0 of the samples sintered at 950 掳C for 4 h by stepwise synthesis method were:% 337pcNr / 蔚 0 = W 337pcn-1 / 蔚 0, respectively. The effects of adding NiO before and after the secondary synthesis on the sintering properties and properties of the samples were also studied. The results showed that the density of the samples sintered with NiO was higher after the synthesis. The sintering temperature of piezoelectric ceramics can be reduced by using non-stoichiometric method, but the piezoelectric and dielectric properties are seriously deteriorated. Secondly, in order to make the ceramics have lower sintering temperature and excellent piezoelectric properties at the same time, The experimental results show that the addition of CuO does not change the main crystal structure of the matrix. At the same time, the density of the samples sintered at 950 掳C, the dielectric loss tan 未 and the relative dielectric constant 蔚 33 T / 蔚 0 are respectively 1. 411pc/ N86 / 2449, respectively. The addition of COO has a certain application potential. The addition of COO can effectively reduce the sintering temperature of the ceramics. Finally, PFW, a perovskite structure component, was introduced as sintering assistant, and a step by step synthesis method was used to prepare a new type of ceramic. The effect of PFW content on density, micromorphology and density was studied, and the effect of PFW content on density and micromorphology was studied, and the effect of PFW content on density and micromorphology was investigated, and the effect of PFW content on the density and micromorphology of the ceramics was studied. The results showed that the structure of the perovskite structure PFW was used as a sintering assistant, and the effect of PFW content on the density and micromorphology of the ceramics was studied, and the effect of the PFW content on the density and micromorphology of the ceramics was investigated, and the effect of the PFW content on the density and micromorphology of the ceramics was studied. The sintering temperature of PFW-PNN-PZN-PZT ceramics decreased from 1180 掳C to 940 掳C with the doping of phase structure, dielectric and piezoelectric properties. The sintering density and average grain size of PFW-PNN-PZN-PZT ceramics were increased. The ceramics sintered at 940 掳C for 4 h have excellent properties: D33496pC / N, 蔚 33T / 蔚 0119tan 未 2.1and Tc=242 掳C. these results indicate that the new composition is suitable for multilayer compaction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM282

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