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利用电化学法对Fe-Nb熔体中Nb的活度在三个温度下进行研究,采用下列的固体电解质电池:Mo|Mo,MoO_2||ZrO_2(MgO)||[Nb],NbO_2|Mo+ZrO_2金属陶瓷,Mo对测定的α_o数据进行加工处理,求出下列结果: 1.脱氧反应的自由能 [Nb]+2[O]=NbO_(2(s));△G°=-375350+118.28T,J 2.Nb在铁液中的溶解自由能 Nb_(s)=[Nb]％;△G°=-134260+33.05T,J;γ°_(1873)=1.60 Nb_(1)=[Nb]％;△G°=-161160+42.84T,J;γ°_(1873)=0.92 3.Nb本身的活度相互作用系数当[Nb]含量大约低于0.2％时,脱氧产物和其它合金元素如Al、Cr、V等相似,形成了复合氧化物如FeO·NbO_2。后者的生成自由能估计为:随着熔体中[Nb]含量的继续下降,对生成其它脱氧产物的可能性,本文也进行了讨论。
The activity of Nb in Fe-Nb melt was investigated electrochemically at three temperatures using the following solid electrolyte cells: Mo | Mo, MoO_2 || ZrO_2 (MgO) || [Nb], NbO_2 | Mo + ZrO 2 cermet, Mo The measured α_o data were processed and the following results were obtained: 1. Free energy [Nb] + 2 [O] = NbO 2 (s)) of the deoxygenation reaction; ΔG ° = -375350 + 118.28T, J 2. Dissolution free energy of Nb in molten iron Nb_ (s) = [Nb]%; ΔG ° = -134260 + 33.05T, J; γ ° _ (1873) = 1.60 Nb_ (1) = [Nb]%; G ° = -161160 + 42.84T, J; γ ° _ (1873) = 0.92 3.Nb itself activity interaction coefficient When the [Nb] content is lower than about 0.2%, the deoxidation product Similar to other alloying elements such as Al, Cr, V and the like, a complex oxide such as FeO.NbO_2 is formed. The latter’s free energy can be estimated as follows: As the [Nb] content in the melt continues to decrease, the possibility of generating other deoxidation products is also discussed.