冷却介质对钛酸钡合成形貌的影响

发布时间：2018-05-07 23:07

  本文选题：玻璃法 + 化学-玻璃法　； 参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：本文利用配比不同的氧化硼、氧化钡、二氧化钛反应体系,通过玻璃法制备钛酸钡,并用扫描电镜、X射线衍射技术、透射电镜、能谱分析等测试技术对实验产物进行表征。对比研究了反应物配比、冷却介质以及煅烧温度等实验条件对产物的形貌和尺寸的影响。实验结果表明,在相同实验条件下,反应体系配比为3:5:2和3:3:2时,能更稳定地制备出钛酸钡粉体。针对3:3:2配比体系,在相同温度下煅烧后采用不同的冷却介质,能获得形貌差异较大的钛酸钡粉体,其中,1000℃下烧结然后空冷获得的产物是形貌较规则的立方块,油冷的产物整体形貌不规则,且伴随不明纳米颗粒的生成,水冷的产物中出现了纳米团簇。随后,本文讨论了不同烧结温度对3:3:2配比体系在水冷条件下获得产物的形貌和尺寸的影响。结果表明,随着煅烧温度的升高,产物中颗粒的尺寸呈稳定增长趋势,例如,800℃产物中的圆盘状颗粒,在900℃的煅烧温度下出现了厚度增长的情况。最后,本文利用3:5:2配比体系,通过化学-玻璃法制备出了钛酸钡,并用扫描电镜、X射线衍射技术等技术对产物进行表征。结果表明,该法能制备出形貌稳定的立方体钛酸钡颗粒。通过对化学-玻璃法和玻璃法反应前驱体的差示热分析和热重分析,可以初步推断,对于同一配比体系,采用化学-玻璃法达到反应最大值所需的温度略低于单一的玻璃法。
[Abstract]:In this paper, barium titanate was prepared by glass method using different reaction systems of boron oxide, barium oxide and titanium dioxide. The products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The effects of reactant ratio, cooling medium and calcination temperature on the morphology and size of the product were studied. The experimental results show that barium titanate powder can be prepared more stably at 3:5:2 and 3:3:2 under the same experimental conditions. For the 3:3:2 system, barium titanate powders with different morphologies can be obtained after calcining at the same temperature in different cooling media. The products sintered at 1000 鈩，

本文编号：1858854