摘要:
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.
关键词:
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热浸镀锌
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硅含量
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热力学计算
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渣
Abstract:
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.
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