含クロム炭素飽和溶鉄と BaO-BaF_2 系フラックス間のりんの分配平衡および同系フラックス中の BaO の活量

概要

論文の詳細を見る
The phosphorus partition between BaO-BaF_2 fluxes and Fe-Cr-C_<satd> alloys was measured at temperatures ranging from 1175℃ to 1300℃ under a CO atmosphere. The phosphorus partition ratio increases with increasing BaO content in the fluxes and decreases with increasing chromium content in Fe-Cr-C_<satd> alloys. The BaO-BaF_2 system was found to have a large phosphate capacity ranging from 10^<26> to 10^<28.5> at 1300℃, which is much larger than that for the CaO-CaF_2 system. The enthalpy change for the dephosphorization reaction by BaO bearing fluxes was determined to be -528kJ/mol. The chromium partition ratio increases with an increase in BaO content especially in the higher BaO content range. The possibility of the removal of phosphorus from Fe-16% Cr-C alloys without much oxidation loss of chromium by using 50% BaO-50% BaF_2 flux was demonstrated. Furthermore, the activity of BaO for the BaO-BaF_2 system was determined at 1200℃ and 1300℃ and the activity of BaF_2 was calculated by using the Gibbs-Duhem relationship. The phase diagram for the BaO-BaF_2 system was also discussed.
1990-03-01