用异醇铝溶液燃烧化学沉积α-Al_2O_3纳米晶

Chemical Deposition for Nanocrystalline α-Al-2O-3 bythe Combustion of Isoalcohol-aluminium Solution

本文提出了一种制备高性能纳米陶瓷粉体的新方法。将异醇铝溶液溶于易燃溶剂中配制成初始反应溶液 ,通过组合喷嘴让该溶液雾化并穿过氧—乙炔火焰 ,通过化学燃烧制备纳米α Al2 O3粉体。通过完全燃烧计算、雾化试验和燃烧试验 ,确定了溶液喷口、雾化剂 (O2 )喷口和氧—乙炔喷口的压力和流量的工艺参数。扫描电镜 ,激光测粒仪 ,高分辨透射电镜分析表明 ,用上述方法制备的纳米α Al2 O3以球形和六方棱柱为主 ,含极少量菱面体 ,颗粒尺寸为 2 0～ 30nm ,粒度均匀细致且分散性好。

A new method for the preparation of high-performance nanocrystalline ceramic powder was developed.Initial liquid was prepared by a dissolving organo-metallic compound into an inflammable dissolvent.The initial liquid was atomized and went through an oxy-acetylene flame by the build-nozzle,and nanocrystalline α-Al-2O-3 powder was deposited by the combustion of the initial liquid.The technological parameters of pressure and flow of the solution spout,the atomization spout and the oxy-acetylene spout were determined by complete combustion calculation,atomization experiments of initial liquid and combustion experiments.The prepared nanocrystalline α-Al-2O-3 powder was analyzed by scanning electron microscope and high-resolution transmission electron microscope,and the atomization liquid drop by laser granule meter.Most of the α-Al-2O-3 powder prepared by the methods above was globular shaped and hexagonal columnar and a little of them was rhombohedra.The particles are homogeneous,fine and well-dispersed with a size between 20 and 30nm.