Preparation And Properties Of Multilayered Low Temperature Cofired PZT-PMS-PZN System High-Power Piezoelectric Ceramics

More than half of the actually used piezoelectric ceramics are high power piezoelectric ceramics. Recently, low temperature cofired high power piezoelectric materials have received a great deal of attention in order to lower the driving voltages of piezoelectric ceramics, to shorten their response time, to improve their overall performance and stability during applications, and to strengthen their ability to resistant high temperature, high humidity, attack and vibration.0.90Pb(Zr0.52Tio.48)03-0.05Pb(Mn1/3Sb2/3)03-0.05Pb(Zn1/3Nb2/3)03(0.90PZT-0.05PMS-0.05PZN) quaternary piezoelectric ceramics have excellent electrical properties(d33=369pC/N,Qm=1381,kp=64%,tanδ=0.44%, ε33T=1600), and thus is the ideal material of high power piezoelectric ceramics in application. Based on this system, the effects of the addition of Li2CO3with different contents on the properties of low temperature sintering of this material have been investigated. The results indicated that Li2CO3can reduce the sintering temperature, and the material added03wt%Li2CO3and sintered in900℃have the best electrical properties:d33=276pC/N, Qm=700, KP=46.1%, tanδ=0.24%, ε33T=1033. As well, the effects of adding sintering additives Li2CO3and CuO were also compared on the low temperature sintering properties of the material. The results showed that although the addition of Li2CO3improves the electrical properties of ceramics wore than CuO but certain vibration performances better than CuO.Secondly, the specific tape-casting technology to make0.90PZT-0.05PMS-0.05PZN+lwt%CuO piezoelectric materials were also studied,various parameters of technologies were optimized, and the optimum technology was finally proposed. The experimental results indicated that the performances of the ceramics made through tape-casting technology were better than that through solid-state reaction method.Finally, the technology to make0.90PZT-0.05PMS-0.05PZN+1wt%CuO multilayered low-temperature cofired ceramics was explored. Eventually, the process of the silk screen printing, the silver paste suitable for low temperature cofired technology and the best technology of exhaust glue, sintering and polarization were determined. The properties of the multilayer and single layer ceramics made in the technology proposed here were also compared. The results showed that there are no significant differences between multi-layer and single-layer ceramics in properties of dielectric loss. Though the mechanical quality factor of the multi-layer ceramics reduced with increased layer number,but their piezoelectric coefficient and dielectric constant increased linearly with layer number. Moreover, the multi-layer ceramics exhibited a better performance of vibration than the single-layer ceramics during vibration experiments. Therefore, compared to single-layer ceramics, multi-layerceramics have more advantages for the miniaturization and integration of function components.