Effect of Dilute Concentrations of Si, Al, Ti, V, Cr, Co, Ni, Nb and Mo on the Activity Coefficient of P in Liquid Iron

Abstract

The interaction coefficients for phosphorus have been determined in the Fe-P-i systems at 1600°C. A Knudsen cell-mass spectrometer combination was used, and the interaction coefficients were computed from the ratio of the intensities of P+ and Fe+. The measured systems are Fe-P-Si, Fe-P-Ti, Fe-P-Al, Fe-P-V, Fe-P-Cr, Fe-P-Co, Fe-P-Ni, Fe-P-Nb and Fe-P-Mo.
The experimental results show that the interaction coefficients for phosphorus with the elements in the fourth and fifth periods increase with the atomic number of the elements.
The results obtained are summarized as follows; ε^Si_P=11.9±0.6 ε^Al_P=4.6±0.7 ε^Ti_P=-8±2 ε^v_p=-4.9±0.7 ε^Cr_p=-3.8±0.7 ε^Co_P=0.9±0.7 ε^Ni_P=0.7±0.7 ε^Nb_P=-5.4±1.2 ε^Mo_P=-0.4±0.7