低温固相法制备亚微米级钛酸钡粉体的研究

Preparation of submicron barium titanate powders by solid state reaction at low temperature

钛酸钡因其优良的电学性能被广泛应用于多层陶瓷电容器(MLCC)等电子元器件。而关于粉体的制备过程能耗高和废液等问题,传统的制备工艺无法有效地解决。以钡源八水合氢氧化钡(Ba(OH)_2·8H_2O)和高活性钛源偏钛酸(H_2Ti O_3)为原料,采用低温固相法制备出形貌均匀的亚微米级钛酸钡粉体(Ba Ti O_3,BT)。在此基础上研究了球磨工艺(转速、时间)以及合成工艺(反应温度、保温时间)对BT性能的影响,并结合XRD和SEM等手段对产物的晶相组成以及微观形貌和粒径进行表征。结果表明:原料经过700 r/min罐磨5 h后,接着在100℃低温下保温3 h即可制得结晶度较高和粒径分布均匀的立方晶相球形BT。

Barium titanate is widely used in electronic components such as multilayer ceramic capacitors（MLCC） due to its excellent electrical properties. The powders traditional preparation process of high energy consumption and wastewater problems can not be effectively resolved. Submicron BaTiO3 powders with uniform spherical morphology were synthesized by solid state reaction at low temperature, in which, barium hydroxide octahydrate（Ba（OH）2· 8H2O） and meta-titanic acid （H2TiO3） were used as the raw materials. Then the effects of ball milling process（grinding speed, grinding time） and synthetic process（reaction temperature, reaction time） on the properties of barium titanate were studied. The crytal phase composition, morphology and particle size of the product were characterized by X-ray diffraction（XRD） and field emission scanning electron microscopy（SEM）. The results show that the cubic phase barium titanate with high crystallinity and uniform particle size can be obtained when the raw materials are ground at 700 r/min for 5 h and then kept at 100 ℃ for 3 h.