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鐵液中納米Al2O3粒子的運動行為

Motion behavior of Al2O3 nano-particle in liquid iron

  • 摘要: 研究了粒徑為20~40nm的Al2O3納米粉在鐵液中的運動行為.結果表明,經分散后加入鐵液中的Al2O3納米粉,在鐵液中保持60min后,Al2O3粒子沒有產生明顯的團聚或聚集成微米級或更大尺寸的粒子,粒子尺寸為20~60nm,呈現較好的彌散分布狀態.采用布朗運動理論描述納米粒子在鐵液中的運動行為.納米粒子在鐵液中不易發生碰撞和聚集,理論分析與實驗結果一致.納米Al2O3在鐵液中不易團聚或聚集的行為與鋼液中一般的Al2O3夾雜物易碰撞聚集而長大的行為不同.

     

    Abstract: The motion behavior of Al2O3 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 results. The motion behavior of Al2O3 nano-particles is in contrast with usual Al2O3 non-metallic inclusions in liquid steel.

     

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