摘要
通过15N-14N同位素气体交换技术消除液相传质的影响,利用在线质谱分析仪测定了在1873 K下,铁液中氮溶解的界面反应速率常数.结果表明,总流量为600~800 mL·min^−1时可以忽略气相传质的影响,保护气中增加H2的比例有利于降低钢液中杂质元素的浓度.铁液中加入一定量碳、铝、硅,分析得到这三种元素对氮溶解速率是抑制的.依据本实验的数据利用空位解离模型建立反应速率常数ka与氧、硫、碳、铝、硅的活度关系,吸附系数分别是KO=0.96,KS=9.32,KC=0.02,KAl=0.51,KSi=1.16.纯铁液中氮的溶解反应表观速率常数为ka=4.8×10^−6 mol·m^−2·s·Pa.
Nitrogen in the steel can either improve or weaken the performance,as well as reduce product.In the flow of producing steel,it is of paramount importance to adopt some measures to restrain or promote nitrogen dissolution in controlling the nitrogen content in the final product.The dissolution of nitrogen into molten iron in 1873 K has been measured by 15N-14N isotope exchange technology and online mass spectrometer.The results show that 600−800 mL·min^−1 of gas flow rate removes the effect of gas transfer,and increasing the hydrogen content in shielding gas decreases the content of impurity element.A certain amount of C,Al or Si was added to the molten iron,and the three elements were inhibited from the nitrogen dissolution rate.Based on the values of the work and using the dissociation determining model,the reaction apparent rate constant,ka,was built the relationship with the content of oxygen,sulfur,carbon,aluminum and silicon.The adsorption coefficients were calculated to be KO=0.96,KS=9.32,KC=0.02,KAl=0.51 and KSi=1.16,respectively.The nitrogen dissolution reaction apparent rate constant in pure liquid iron is ka=4.8×10^−6 mol·m^−2·s·Pa.
作者
范越文
胡晓军
王鹏栋
李远
FAN Yue-wen;HU Xiao-jun;WANG Peng-dong;LI Yuan(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2020年第S01期34-38,共5页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(51474019)。
关键词
动力学
同位素交换技术
氮溶解
速率常数
吸附系数
kinetics
isotope exchange technology
nitrogen dissolution
rate constant
adsorption coefficient
