【摘要】 用银浴法测定Fe-C-Cr三元系熔体在1500℃的等Cr活度条件下的Cr及C的浓度数据;用Cr浓差电池EMF法测定银浴中Cr的活度。用实验数据及Gibbs-Duhem方程与活度交互作用系数间的倒易关系结合,求出下列活度系数与活度交互作用系数:更多还原

【Abstract】 Iso-chromium-activity lines in Fe-C-Cr system were determined by equilibrating simultaneou-sly seven Fe-C-Cr alloy samples of different composition of Cr and C with a common silver-bathat 1500℃. The activity of Cr in Ag-Cr alloy, was measured with the chromium concentration cellEMF with a double-tubed ZrO₂ as solid electrolyte. The activity coefficient of chromium, Inγc_r,expressed in the form of ε-formalism, was calculated with the experimental data and Inγ_c,theactivity of carbon in Fe-C-Cr ternary melt, was estimated with the method of Gibbs-Duhem in-tegration proposed by the authors elsewhere. The results are as followsInγ°_cr=0.054, ε_cr^cr=5.6, ρ_cr^cr=14.8ε_cr^c=-4.6, ρ_cr^c=0.4, ρ_cr^crc=-16.9Inγ_c^o=-0.49, ε_c^c=13.4, ρ_c^c=-24.5ε_c^cr=-4.6, ρ_c^cr=-14.2, ρ_c^c,cr=-17.7These results were compared with the data published in the literatures and the difference betweenthem were shortly discussed.更多还原