锌铝池中Si含量对渣相形成的影响

采用Thermo-Calc软件分别计算硅在不同温度Zn-50%Al-xFe-ySi (原子数分数)熔池液相中的溶解度及不同温度Zn-30%Al-2%Fe-xSi (质量分数)熔池中开始形成τ5渣相和FeAl3渣相消失时该熔池中硅含量，采用平衡合金法测定Zn-50%Al-xFe-ySi合金液相中硅的溶解度和不同硅含量的Zn-30%Al-2%Fe-xSi合金的相平衡关系.当温度分别为540、560、580、600和620℃时，硅在Zn-50%Al- xFe- ySi体系液相中的溶解度(原子数分数)计算值分别为0．82%、0．95%、1．11%、1．28%和1．47%，实验结果与计算结果吻合很好.当熔池温度分别为580、600和620℃时，在Zn-30%Al-2%Fe-xSi合金中刚开始出现τ5相时所对应硅质量分数的计算值分别为0．6%、0．72%和0．84%，发生FeAl3相消失对应的锌池中硅质量分数的计算值分别为1．12%、1．22%和1．34%，实验结果与计算预测结果基本一致.

Effect of Si content in the zinc-aluminium bath on the formation of slag phase

The solubility of silicon in a Zn-50%Al- xFe- ySi ( in atomic fraction) molten bath and the content of silicon in a Zn-30%Al-2%Fe-xSi ( in mass fraction) molten bath corresponding to the appearing of τ5 slag phase and the disappearing of FeAl3 phase were calculated at different temperatures using the Thermo-Calc software. At the same time, the solubility of silicon in liquid phase in the Zn-50%Al-xFe-ySi alloy and the phase equilibrium relationship of the Zn-30%Al-2%Fe-xSi alloy were experimentally determined by using the equilibrium alloy method. The results show that the calculated solubility of silicon in liquid phase in the Zn-50%Al-xFe-ySi system at 540, 560, 580, 600 and 620℃ are 0. 82%, 0. 95%, 1. 11%, 1. 28% and 1. 47%, respectively, which agree well with the experimental data. When the temperature of the molten bath is 580, 600, and 620℃, the calculated content of silicon in the Zn-30%Al-2%Fe- xSi alloy corresponding to the appearing of τ5 phase in the molten bath is 0. 6%, 0. 72% and 0. 84%, and the values corresponding to the disappearing of FeAl3 phase are 1. 12%, 1. 22% and 1. 34%, respectively, which agree basically with the experimental results.