Effect of addition of surface active element on supersaturation in iron melt

表面活性元素的添加对铁液过饱和度的影响

• 批准号: 06650827
• 负责人: INOUE Ryo
• 金额: $ 1.28万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650827/
• 关键词: Surface active element; Supersaturation; Liquid iron; Alumina; Precipitation; Interfacial energy; Hercynite; Al_2O_3生成; 界面反応; 一方向凝固; テルル; 介在物

The supersaturation and equilibrium experiments were carried out at 1873K by using Fe-Al alloys and CaO-Al_2O_3 slags in an Al_2O_3 crucible, and the effects of Te addition and cooling rate on supersaturation were studied. The conclusions were summarized as follows.1. Total oxygen content for a given total aluminum content obtained in equilibrium and supersaturation experiments without Te was not influenced by the cooling rate.2. In supersaturation experiments with Te addition, total oxygen contents decreased to a constant value as a result of the removal of precipitated Al_2O_3 in the range of [% Te]>0.005 and the degree of lowering increased with a decrease in cooling rate.3. The critical supersaturation ratio was estimated to be about 10^2 by considering the effect of Te on the interfacial energy between liquid iron and alumina.4. Tellurium distribution ratio between an Fe-Al alloy and CaO-Al_2O_3 slag was found to be linearly related to the aluminum content in logarithmic form with a slope of 2/3, suggesting that Te in slag is present as divalent anion.An Fe-0.03-0.44mass% Al alloy or an Fe-0.07-0.58mass% Al-0.2-0.6mass% Te alloy was reoxidized with the Fe_tO(<3mass%)-containing CaO-Al_2O_3 slags at 1873 K for 5 and 60 min. The effects of slag compositions, Te addition and initial Fe_tO contents on the reoxidation of aluminum were studied. The following conclusions were obtained .1. Acid-insoluble Al as primary inclusions containing alumina, hercynite and Fe_tO-Al_2O_3 mixture was observed in the experiments of using CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 5 min.2. The oxygen in liquid iron was supersaturated in the rapid cooling experments except those of the CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 60 min with Te addition.3. The relations between Fe_tO and Al contents were observed to be in equilibrium in the experiments except those of the CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 5 min.

以Fe-Al合金和CaO-Al_2O_3渣在Al_2O_3坩埚中于1873K温度下进行过饱和和平衡实验，研究了Te添加量和冷却速率对过饱和的影响。主要结论如下： 1．在没有Te的平衡和过饱和实验中获得的给定总铝含量的总氧含量不受冷却速率的影响。2．在添加Te的过饱和实验中，在[%Te]>0.005范围内，由于析出Al_2O_3的去除，总氧含量降低至恒定值，且降低程度随着冷却速率的降低而增大。3．考虑Te对铁液与氧化铝界面能的影响，估计临界过饱和度约为10^2。4． Fe-Al合金和CaO-Al_2O_3渣之间的碲分布比与铝含量呈对数线性关系，斜率为2/3，表明渣中Te以二价阴离子形式存在。Fe-0.03-0.44mass%铝合金或Fe-0.07-0.58mass% Al-0.2-0.6mass% 用含Fe_tO(<3mass%)的CaO-Al_2O_3渣在1873 K下对Te合金进行再氧化5和60 min。研究了炉渣成分、Te添加量和初始Fe_tO含量对铝再氧化的影响。得到以下结论 .1．以Al_2O_3坩埚饱和的CaO-Al_2O_3-Fe_tO渣为原料，在5 min.2实验中观察到初生夹杂物为酸不溶性Al，包括氧化铝、铁铝尖矿和Fe_tO-Al_2O_3混合物。除CaO-Al_2O_3-Fe_tO渣在Al_2O_3坩埚中添加Te 60 min饱和外，在快冷实验中，铁液中的氧均处于过饱和状态。 3．除了用Al_2O_3坩埚饱和5 min的CaO-Al_2O_3-Fe_tO渣外，实验中Fe_tO与Al含量之间的关系均处于平衡状态。