无铅压电陶瓷的压电及其介电储能性能研究

发布时间：2018-03-19 12:07

  本文选题：无铅压电陶瓷　切入点：压电性　出处：《宁波大学》2014年硕士论文　论文类型：学位论文

【摘要】：材料作为信息工业和社会经济发展的重要基础和有力保障，与能源、信息并称为现代文明的三大支柱，是人类赖以生存和可持续发展的重要物质基础。无论是提高人民基本的物质文化生活水平，还是巩固和加强国防工业等各个领域，都需要高性能、多层次的、大量的高新材料。锆钛酸铅(PZT)基压电陶瓷在其准同型相界处具有十分大的压电响应，因此被广泛应用到制动器、传感器和其它机电设备。然而，，由于PZT基压电陶瓷中含有大量氧化铅成分，在制备PZT基压电陶瓷的过程中氧化铅具有十分高的挥发性，氧化铅是一种剧毒物质，会造成严重的铅污染和环境问题。因此,开发能满足需要的无铅压电陶瓷来代替含铅压电材料越来越引起大家的关注。 本文主要工作有三大方面：第一方面，利用添加剂La可以使压电陶瓷在MPB处有更优异的压电响应这一原理，制备出一种新型的钛酸盐基压电陶瓷，研究并探讨了(Bi1-xNa0.8K0.2Lax)0.5TiO3(x=0,0.005,0.01,0.02,0.04,0.08)陶瓷体系的压电性、铁电性和退极化机制。研究发现，(Bi0.995Na0.8K0.2La0.005)0.5TiO3陶瓷有最高的压电性和最强的铁电性。第二方面，为了研究通过电场诱导产生可逆的弛豫铁电体相变来获得高介电储能密度的钛酸盐基陶瓷，选取(1-x)Bi0.47Na0.47Ba0.06TiO3-xKNbO3(BNBT-xKN)(x=0,0.01,0.02,0.04,0.06,0.08)这种陶瓷来研究它的介电储能性质。研究表明在一定温度范围内BNBT-0.06KN陶瓷表现出很好的温度稳定性和抗疲劳特性，这非常有利于实际应用。第三方面，在前一个实验的基础上对(1-x)(Bi0.5Na0.5)TiO3-xKNbO3(BNT-xKN)(x=0,0.06,0.08,0.10,0.12)这个陶瓷体系继续进行了介电储能性质的探讨。获得了一个更简单的化学组成，这有利于铁电体的良好的一致性和可重复性，因此BNT-xKN比BNBT-xKN体系有更好的应用价值和前景。
[Abstract]:As an important foundation and powerful guarantee for the development of information industry and social economy, materials, together with energy and information, are regarded as the three pillars of modern civilization. It is an important material basis for the survival and sustainable development of mankind. Whether it is to improve the basic material and cultural living standards of the people or to consolidate and strengthen the national defense industry and other fields, it needs high performance and multi-level. A large number of high-tech materials. Lead zirconate titanate PZT-based piezoelectric ceramics have a very large piezoelectric response at its quasi-homogeneous phase boundary, so they are widely used in brakes, sensors and other mechanical and electrical equipment. Due to the large amount of lead oxide in PZT based piezoelectric ceramics, lead oxide is highly volatile in the preparation of PZT based piezoelectric ceramics. Lead oxide is a highly toxic substance, which can cause serious lead pollution and environmental problems. The development of lead-free piezoelectric ceramics to replace lead-containing piezoelectric materials has attracted more and more attention. In this paper, there are three main aspects: firstly, a new type of titanate based piezoelectric ceramics has been prepared by using the principle that La can make piezoelectric ceramics have better piezoelectric response at MPB. The piezoelectric properties, ferroelectric properties and depolarization mechanism of Bi0.995Na0.8K0.2La0.2La0.005TiO0. 005TiO3 ceramics have been studied and discussed. The piezoelectric properties, ferroelectric properties and depolarization mechanism of Bi0.995Na0.8K0.2La0.005La0.005TiO3 ceramics have been studied and discussed. The second aspect is that the piezoelectric properties of Bi0.995Na0.8K0.2La0.005La0.005TiO3 ceramics have the highest piezoelectric properties and the strongest ferroelectric properties. In order to obtain titanate based ceramics with high dielectric storage density, the reversible relaxor ferroelectric phase transition induced by electric field was studied. In order to study the dielectric energy storage properties of BNBT-0.06KN ceramics, the dielectric energy storage properties of BNBT-xKNBO3 (BNBT-xKNO3) BNBT-xKNBO3) were studied. The results show that the dielectric energy storage properties of BNBT-0.06KN ceramics show good thermal stability and fatigue resistance in a certain temperature range, which is very beneficial to practical application. Third, in the third aspect, it is shown that the dielectric energy storage properties of BNBT-0.06KN ceramics are very good in a certain temperature range. On the basis of the previous experiment, the dielectric energy storage properties of this ceramic system, Bi0.5Na0.5Na0.5TiO3-xKNbO3O3, BNT-xKNO3, BNT-xKNO3 (0.06 ~ 0.08) 0.100.12), have been investigated. A simpler chemical composition has been obtained, which is beneficial to the good consistency and repeatability of ferroelectrics. Therefore, BNT-xKN has better application value and prospect than BNBT-xKN system.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM282

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