【摘要】 以六水氯化镁和尿素为原料,采用均匀沉淀法制备出氢氧化镁沉淀,利用不同改性干燥法除去沉淀中的湿分,再将干燥的氢氧化镁粉体经马弗炉煅烧得到纳米氧化镁粉体,通过透射电子显微镜和X射线衍射仪的表征与分析,研究了改性干燥方式对纳米氧化镁粉体形貌、颗粒尺寸和团聚情况的影响,讨论了改性干燥的基本原理和改性剂的作用。研究结果表明,改性干燥方式对纳米氧化镁颗粒形貌和大小的影响不大,对其颗粒间团聚状态影响很大。更多还原

【Abstract】 Magnesium hydroxide precipitate was prepared by homogenous precipitation method,using MgCl2·H2O and CO(NH2)2 as raw materials.Before it was calcined to produce magnesium oxide nano-particles,the precipitate was dried to remove its solvent by different methods of surface modification drying.All samples were characterized by X-ray diffraction and transmission electron microscope to investigate the effects of drying methods on the morphology and particle size of nano-scale magnesia.Principle of surface modification drying and action of modifiers were discussed.The results indicate that magnesium oxide nano-particles obtained by different surface modification drying processes are with almost same particle diameters of 20 nm to 30 nm and a great difference in agglomeration state.更多还原