铁液中纳米Al_2O_3粒子的运动行为

Motion behavior of Al_2O_3 nano-particle in liquid iron

研究了粒径为20～40nm的Al2O3纳米粉在铁液中的运动行为．结果表明，经分散后加入铁液中的Al2O3纳米粉，在铁液中保持60min后，Al2O3粒子没有产生明显的团聚或聚集成微米级或更大尺寸的粒子，粒子尺寸为20～60nm，呈现较好的弥散分布状态．采用布朗运动理论描述纳米粒子在铁液中的运动行为．纳米粒子在铁液中不易发生碰撞和聚集，理论分析与实验结果一致．纳米Al2O3在铁液中不易团聚或聚集的行为与钢液中一般的Al2O3夹杂物易碰撞聚集而长大的行为不同．

The motion behavior of A1203 nano-particles with a size of 20 to 40 nm in high temperature liquid iron was studied. The results showed that after the nano-particles were kept on for 60 min in liquid iron, their size was still 20 to 60 nm; moreover, they did not become micro-particles and disperse better in liquid iron. The motion behavior of the nano-particles in liquid iron was described by the Brown theory. It is indicated that the phenomena of collision, reuniting and agglomeration of the nano-particles do not occur in liquid iron, and the motion behavior of the nano-particles described by the Brown theory is consistent with experiment resuits. The motion behavior of A1203 nano-particles is in contrast with usual A1203 non-metallic inclusions in liquid steel.