Study On Low Temperature Sintering Process Of Perovskite Type Ceramic Energy Storage Capacitors

Perovskite-type ceramic energy storage capacitor materials have the advantages of high power density and high discharge efficiency,which are ideal materials for pulsed energy storage devices.High sintering temperature is not conducive to the industrial production and practical application of multilayer ceramic capacitors.The existing perovskite type dielectric energy storage materials can be mainly divided into two systems that are lead-free and lead-containing.In this thesis,the low-temperature sintering process of BaTiO₃-Nb₂O₅-NiO and Sr_0.8Pb_0.095Bi_0.07TiO₃ perovskite-type energy storage ceramics was studied using sintering aids,in order to obtain better performance at lower sintering temperature.The BaTiO₃-Nb₂O₅-NiO ceramics were prepared by the traditional solid-state sintering method.The effects of different NiNb₂O₆ doping amount on the phase structure,microstructure,dielectric properties and energy storage properties of the system were studied.When the doping amount of NiNb₂O₆ is 1.0 mol%and the sintering temperature is 1310°C,the dielectric constant is 4208 and the dielectric loss is0.008.The best"shell-core"structure is obtained,and its temperature stability test is satisfied X7R capacitor standard.On this basis,the effects of different kinds of sintering agents on the properties of low-temperature sintering samples were studied,and then the addition contents of sintering agents and sintering process were studied.The No.2sintering agents was used,the addition content was 3 wt%,the sintering temperature was 1110°C,the energy storage density was 0.194 J/cm³,and the energy storage efficiency was 74.33%.The low-temperature sintered ceramic samples with the best dielectric properties and energy storage characteristics and their low-temperature sintering process were obtained.The effects of sintering process parameters such as heating rate,holding time,sintering temperature and cooling rate on the phase structure,microstructure,dielectric properties and energy storage properties of Sr_0.8Pb_0.095Bi_0.07TiO₃ ceramics were studied,and the best sintering was obtained.Process.On this basis,the effects of sintering additive content and sintering process on the properties of low-temperature sintering samples were studied.The addition amount of sintering additive is 1.8 wt%,the sintering temperature is 1110°C,the energy density is 0.228 J/cm³ and the discharge efficiency is 94.2%under the electric field strength of 50 kV/cm.Discharge performance tests were performed with a discharge time of 140 ns and a power density of 5.2x10⁷ W/kg.The low-temperature sintering process system of energy storage medium material with high power density and high discharge efficiency is obtained.It is tested for temperature stability to meet the Y5V capacitor standard.