高介高稳定性Y5P陶瓷电容器材料介电性能的研究 毕业设计(论文).doc

高介高稳定性Y5P陶瓷电容器材料介电性能的研究 摘 要 BaTiO3基陶瓷电容器是一类用途广泛的Ⅱ类陶瓷电容器，即低频高介陶瓷电容器。由于其本身具有高介电常数、绝缘特性，并可以通过元素掺杂改性达到美国电子工业协会（EIA）标准Y5P△C/C≤10%）与X7R、X8R、Y5V等陶瓷电容器的要求，而成为各国材料科研人员的研究热点。以BaTiO3-Nb2O5-Co3O4(BTNC)陶瓷系统为研究对象，研究添加不同掺杂物BiTi3O12（BIT）、Bi0.5Na0.5TiO3（NBT）、CaCu3Ti4O12(CCTO)对系统介电性能的影响。通过添加适量的掺杂物，达到提高系统介电常数和温度稳定性的目的。实验结果表明： BIT掺杂量为6.0wt%(质量比)，烧结温度为1260℃的BTNC基陶瓷，其介电常数最高可达3000，温度稳定性△C/C≤15%； NBT掺杂量为2.4at%（物质的量比），烧结温度为1260℃的BTNC基陶瓷，其介电常数最高为2850，温度稳定性可以达到△C/C≤10%；在1130℃下烧结，掺杂2.0at% CCTO的BTNC基陶瓷，在室温到85℃范围内，介电常数可达到2800以上，温度稳定性△C/C≤5%。 Investigation of Dielectric Properties of Y5P Ceramic Capacitors with High?Temperature Stability and High Dielectric Constant ABSTRACT Barium titanate based ceramic capacitors were multi-functional materials, it belonged to low frequency and high dielectric ceramic capacitor, which was called Ⅱ type ceramics. Barium titanate based ceramic capacitors were Research focus to national Materials scientists because of its high dielectric constant, insulation performance and can be modified by doping to achieve the requirements of Electronic Industries Association (EIA) ceramic capacitors standard as Y5P, X7R, X8R, Y5V, etal. In this paper, the ceramic of BaTiO3-Nb2O5-Co3O4 (BTNC) systems was studied as the main object, in order to research the effect of the system dielectric properties by adding different dopants Bi4Ti3O12（BIT）、Bi0.5Na0.5TiO3（NBT）、CaCu3Ti4O12(CCTO). Adding appropriate amount of dopants can improve?the dielectric constant and temperature stability. It was found that the the maximum dielectric constant of BTNC system, which was doped 6% BIT and sintered at 1260℃, was 3000, and the temperature stability was △C/C≤15%; the the maximum dielectric constant of BTNC system, which was doped 2.4% NBT and sintered at 1260℃, was 2850, and the temperature stability was △C/C≤15%; In?the range?from room temperature to?85 ℃, the the dielectric constant of BTNC system, which was doped 2% CCTO and sintered at 1130℃, reached 2800 or more, and the temperature stabi