Fe-Mn-Al-O熔体中Mn、Al间活度相互作用系数的测定  

Determination of activity interaction parameters between Mn and Al in Fe-Mn-Al-O melts

作　　者：张杰[1] ZHANG Jie(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《中国冶金》2022年第7期51-56,共6页China Metallurgy

基　　金：国家自然科学基金资助项目(52104293);中国博士后科学基金资助项目(2021m690367)。

摘　　要：鉴于有关高Mn、Al含量钢液中Mn、Al间活度相互作用系数的研究匮乏,以及缺乏合理热态试验方法的现状,首先采用不同方法开展相关热力学试验,得到了适用于高Mn、Al含量钢液的热力学研究方法。采用电阻炉开展试验,将CaO-Al_(2)O_(3)渣覆盖在Fe-Mn-Al熔体表面,防止Al的氧化和Mn的挥发,保证热力学数据的准确性。其中,金属与渣的质量比为2.4。之后,将样品置于Al_(2)O_(3)坩埚中、外套石墨坩埚开展试验,试验采用Ar-H_(2)混合气,流量比为9∶1,样品在1600℃条件下平衡2 h。结果表明,随着Mn含量的增加,Al含量降低;采用Wagner模型进行分析,最终得到Mn、Al间的一阶活度相互作用系数e^(Mn)_(Al)为0.0288、二阶活度相互作用系数r^(Mn)_(Al)为-0.00025。Due to lack of research on the activity interaction parameters between Mn and Al in high Mn and Al content molten steel and lack of reasonable thermal test methods,a new experimental method that could be used to study the thermodynamic properties of high Mn and Al content molten steel was obtained.The resistance furnace was used,and CaO-Al_(2)O_(3) slag was covered on the surface of Fe-Mn-Al melt to prevent the oxidation of Al and the volatilization of Mn,and ensure the accuracy of thermodynamic data.The mass ratio of metal to slag was 2.4.The sample placed in an Al_(2)O_(3) crucible and covered with a graphite crucible was equilibrated for 2 h under the conditions of 1600℃and Ar-H_(2) gas mixture with a flow ratio of 9 to 1.The preliminary experimental results show that with the increase of Mn content,the Al content decreases.From the WIPF,the first and second-order activity interaction parameters,e^(Mn)_(Al) and r^(Mn)_(Al),are determined to be 0.0288 and-0.00025,respectively.

关 键 词：Fe-Mn-Al-O体系 高锰高铝钢 热力学 试验方法 活度相互作用系数 

分 类 号：TF701[冶金工程—钢铁冶金]