超声波场下氢氧化铝制备超细氧化铝的研究

Study on preparation of ultrafine alumina by aluminum hydroxide under ultrasonic field

超细粉体材料是新型材料的重点研究领域之一。其中超细氧化铝因其强度高、比表面积大等特性被广泛应用于精细陶瓷、复合材料、催化剂及其载体等领域。传统方法制备超细粉体存在着粒径分布大、生产成本过高、污染严重、技术复杂等诸多问题,而超声波技术因其在超细粉体粒径、粒径分布及形貌调控等方面的独特优势,逐渐成为超细粉体制备的前沿技术。以氢氧化铝为原料,采用超声辅助碳酸铝铵热分解法,通过对氢氧化铝进行酸溶、铝盐的超声沉淀、前驱体的干燥,最后煅烧制备出粒径为100~200nm的超细α-Al_(2)O_(3),并对产物进行了一系列的表征分析,探索出了制备粒径较小、分散性好的超细氧化铝的理想工艺参数。

The ultrafine powder material is one of the key research fields of new materials.Ultrafine alumina is widely used in fine ceramics,composite materials,catalysts and their supporters due to its high strength and large specific surface area.The conventional methods of preparing ultrafine powders have many problems,such as large particle size distribution,high production cost,serious pollution and complex technology.However,the unique advantages of ultrasonic technology in controlling the particle size,particle size distribution and morphology of ultrafine powders have gradually become the frontier technology for ultrafine powders preparation.In this paper,aluminum hydroxide was used as raw material,and ultra-fineα-Al_(2)O_(3) with a particle size of 100-200 nm was prepared by ultrasonic-assisted aluminum ammonium carbonate thermal decomposition method through acid dissolution of aluminum hydroxide,ultrasonic precipitation of aluminum salt,drying of precursor and final calcination.The products were characterized and analyzed,and the ideal process parameters for preparing ultrafine alumina with small particle size and good dispersion were explored.