相转移法辅助水热合成纳米钛酸锶粉体的研究

发布时间：2018-03-06 16:48

  本文选题：钛酸锶　切入点：相转移法　出处：《上海工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：钛酸锶粉体是一种应用前景广泛且重要的多功能陶瓷材料。它广泛用于传感器、电容器、压敏电阻器等电子元件的制备。本论文分别采用水热法、相转移法辅助水热法来合成钛酸锶粉体,并对所合成的钛酸锶粉体进行表征与分析,探索这两种合成方法的最佳工艺参数。水热合成工艺,以硝酸锶(Sr(NO3)2)、钛酸四丁酯为原料,氢氧化钾(KOH)为矿化剂,成功制备出钛酸锶粉体,并对制备出的钛酸锶粉体依次进行了XRD、SEM的表征与分析。结果表明,在最佳工艺参数下可制备出结晶度好,粒径在60~110 nm之间的纳米钛酸锶粉体;但所制的钛酸锶粉体出现了不可避免的团聚现象。相转移法辅助水热合成工艺,以钛酸四丁酯、硝酸锶为原料,氢氧化钾为矿化剂,SPAN80为表面活性剂,石油醚为有机溶剂,通过水热法合成前驱体钛酸锶后,在搅拌作用下加入SPAN80和石油醚,成功制备出纳米钛酸锶粉体。通过XRD、SEM、TEM-EDS和激光粒度分析仪对所制粉体进行表征和分析,着重分析了SPAN80的添加量对钛酸锶粉体性能的影响,找出制备钛酸锶粉体的最佳工艺参数。结果表明,与水热法相比,相转移法辅助水热合成的纳米Sr Ti O3粉体的粒径较小,物相结构未发生改变。相转移法辅助水热合成工艺的最佳参数是:反应温度为130℃,矿化剂浓度为1.8 mol/L,反应时间为20 h,SPAN80添加量为10%(体积分数)。在最佳工艺参数下制备出的纳米钛酸锶粉体,均一性很好,形貌呈现球形,纯净无杂质,粒径约为38 nm,无团聚现象或轻微团聚;钛酸锶粉体表面由极性变为非极性,分散性好。
[Abstract]:Strontium titanate powder is a widely used and important multifunctional ceramic material. It is widely used in the preparation of electronic components such as sensors, capacitors and varistors. Strontium titanate powder was synthesized by phase transfer assisted hydrothermal method, and the synthesized strontium titanate powder was characterized and analyzed. The optimum technological parameters of these two synthetic methods were explored. Strontium titanate powder was successfully prepared by using potassium hydroxide (Koh) as mineralizer, and the prepared strontium titanate powder was characterized and analyzed by XRDX SEM in turn. The results showed that the crystallinity of strontium titanate powder could be obtained under the optimum technological parameters. Nanocrystalline strontium titanate powder with particle size of 60 ~ 110nm, but the synthesized strontium titanate powder appeared inevitable agglomeration phenomenon. Phase transfer method assisted hydrothermal synthesis process, using tetrabutyl titanate and strontium nitrate as raw materials, The precursor strontium titanate was synthesized by hydrothermal method with potassium hydroxide as mineralizer SPAN80 as surfactant and petroleum ether as organic solvent. After stirring, SPAN80 and petroleum ether were added. The nanocrystalline strontium titanate powder was successfully prepared. The powder was characterized and analyzed by XRDX SEMMOTEM-EDS and laser particle size analyzer. The effect of the addition of SPAN80 on the properties of strontium titanate powder was emphatically analyzed. The optimum technological parameters for preparing strontium titanate powder were found out. The results showed that the particle size of nanometer Sr TIO 3 powder assisted by phase transfer method was smaller than that by hydrothermal method. The phase structure has not changed. The optimum parameters of the phase transfer method for hydrothermal synthesis are as follows: the reaction temperature is 130 鈩，

本文编号：1575656