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Thermodynamics of BaO bearing fluxes

BaO 轴承磁通的热力学

基本信息

批准号：
03650538
负责人：
SUZUKI Kichiya
金额：
$ 1.47万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650538/
关键词：
steelmaking thermodynamics barium oxide manganese oxide activity dephosphorization flux high manganese steel 溶解度状態図

项目摘要

The purpose of present study is to investigate the thermodynamic properties of BaO- MnO fluxes.The activity of MnO in the BaO-MnO flux was measured at 1573 and 1673K, by equilibrating the flux, a Ag-Mn alloy in a nickel crucible, and a gas mixture of CO and CO_2. The activity of BaO in the flux was calculated by using Gibbs-Duhem relationship. The influence of BaF_2 on the thermodynamics of the BaO-MnO system, including the solubility of MnO in the BaO-BaF_2 system, was also investigated at 1573K and the liquid region was established in the BaO-BaF_2-MnO ternary diagram..Furthermore, the phosphorus and manganese partition ratios between BaO-MnO(BaF_2,CaO) melts and carbon saturated Fe-Mn melts were measured between 1573 and 1673K in a CO atmosphere. The sulfur partition ratio between BaO-MnO flux and silver was also measured at 1573K with the partial pressure of oxygen of 7.03X10^<-5>Pa. The phosphorus partition ratio increases with increasing BaO content of the flux. The manganese partition ratios were approximately constant at 0.64, 0.33 and 0.23 at 1573, 1623 and 1673K, respectively. The phosphate capacity of the BaO-MnO flux is as high as that of BaO-MnO flux and is far larger than those of CaO-bearing fluxes. The sulfide capacity of the BaO-MnO system at 1573K increases with increasing BaO content of the flux. Its value ranges from 10^<-0.4> to 10^<-0.2> and is far larger than any known flux systems.

为了研究BaO-MnO系助熔剂的热力学性质，在1573和1673 K下，通过在镍坩埚中平衡BaO-MnO系助熔剂、Ag-Mn合金以及CO和CO_2的混合气体，测定了BaO-MnO系助熔剂中MnO的活度。利用Gibbs-Duhem关系式计算了熔剂中BaO的活度。研究了BaF_2对BaO-MnO体系热力学的影响，包括MnO在BaO-BaF_2体系中的溶解度，并在BaO-BaF_2-MnO三元相图中建立了液相区。此外，在1573 ~ 1673 K，CO气氛下，测定了磷和锰在BaO-MnO（BaF_2，CaO）熔体和碳饱和Fe-Mn熔体之间的分配比。在氧分压为7.03 × 10 ~（13）Pa、温度为1573 K时，测定了硫在BaO-MnO助熔剂与银之间的分配比<-5>。磷的分配比随熔剂中BaO含量的增加而增加。在1573、1623和1673 K时锰的分配比分别为0.64、0.33和0.23。BaO-MnO系熔剂的抗磷能力与BaO-MnO系熔剂相当，远大于CaO系熔剂。在1573 K时，BaO-MnO系的硫化容量随BaO含量的增加而增加。它的值范围从10^<-0.4>到10^<-0.2>，远远大于任何已知的通量系统。