超细晶钛酸钡基储能陶瓷的性能与微观结构

发布时间：2018-06-16 21:41

本文选题：储能陶瓷 + 钛酸钡　；参考：《工程科学学报》2017年06期

【摘要】：利用水基化学包覆法在纳米钛酸钡粉体包覆氧化铝、二氧化硅和氧化锌等物质,并通过两段式烧结法制备了平均晶粒尺寸120 nm的超细晶钛酸钡基储能陶瓷.包覆层的存在抑制了晶粒生长和异常晶粒长大,同时将陶瓷的交流击穿场强大幅提高至150 kV·cm~(-1)以上,储能密度达到0.829 J·cm~(-3).电子能量损失谱显示,包覆掺杂的元素明显偏聚于陶瓷晶界,形成具有芯-壳结构的晶粒.而高温阻抗谱的测试和拟合结果则进一步解释了陶瓷性能改善的原因.虽然此超细晶陶瓷的储能密度并不十分突出,但其晶粒细小均匀、烧结温度低,因而可用于制备多层陶瓷电容器,从而大幅提高储能密度,这是常见的储能陶瓷无法实现的.
[Abstract]:Ultrafine barium titanate based energy storage ceramics with average grain size of 120 nm were prepared by water based chemical coating on nano-barium titanate powder, such as alumina, silicon dioxide and zinc oxide. The existence of cladding layer inhibits grain growth and abnormal grain growth. At the same time, the AC breakdown field strength of the ceramics is increased to more than 150kV / cm ~ (-1), and the energy storage density is up to 0.829 J / cm ~ (-1). The electron energy loss spectra show that the coated doped elements tend to converge at the grain boundaries of the ceramics to form grains with core-shell structure. The test and fitting results of high temperature impedance spectrum further explain the improvement of ceramic properties. Although the energy storage density of the ultrafine crystalline ceramics is not very prominent, its grain size is fine and uniform, and the sintering temperature is low, so it can be used to prepare multilayer ceramic capacitors, thus greatly increasing the energy storage density, which can not be realized by common energy storage ceramics.
【作者单位】：清华大学新型陶瓷与精细工艺国家重点实验室;
【基金】：国家重点基础研究发展计划资助项目(2015CB654604) 国家自然科学基金创新研究群体项目(51221291);国家自然科学基金资助项目(51272123)
【分类号】：TQ174.1

【相似文献】