制备金属氧化物纳米粉的液雾燃烧工艺研究

将金属熔融并过热到一定的温度，然后由高压纯氧将其雾化并立即于燃烧塔内进行直接氧化燃烧，可快速制得金属氧化物纳米粉体。应用该工艺不仅制备出了Ｂｉ２Ｏ３、ＳｎＯ２、Ｉｎ２Ｏ３粉末，同时对Ｓｎ－Ｉｎ合金熔体进行液雾燃烧时，获得了复合的ＳｎＯ２／Ｉｎ２Ｏ３金属氧化物纳米粉体，粉末的最大粒径为２５ｎｍ。金属雾滴燃烧时的强烈挥发、高速飞行过程中的再雾化以及表面氧化膜的快速剥离是使得燃烧产物达到纳米级粉体的基本原因。

Study on Atomizing Combustion Technique for Preparing Metal Oxide Nanometer Powder

First to melt the metal in a vitrified pot and to be over heated to a giving temperature, then the ultra heated metal melt is atomized by oxygen with high pressure. While atomized fine melt droplets into a combustion tower, the droplets would be oxidized strongly to burning and form into metal oxide nanometer powder quickly. Not only the Bi 2O 3, SnO 2 and In 2O 3 had been prepared through the atominzing combustion technique, but also had attained composite SnO 2/In 2O 3 nanometer metal oxide powder. The size of the most grain is 25nm. Intense volatilizing of the metal at high temperature, further atominzing of the droplets in high speed fly and speed stripping of the oxide film are the principal reasons that the combusted products can form nanometer powder.