Phase Equilibria Of The Mno-Sio2-Crox System At 1873 K Under Controlled Oxygen Partial Pressure

In order to determine the phase diagram of the MnO-SiO2-CrOx system for P-O2=2 x 10(-6) Pa at 1873 K, one of the important information for the controlling of non-metallic inclusions (deoxidation products) formation during the stainless steel Si-deoxidation process, the following equilibrium experiments were conducted at 1873 K under controlled oxygen partial pressure, P-O2:(I) Phase equilibria of the MnO-Cr2O3 binary system were measured as a function of P-O2 (2 x 10(-6)-2 x 10(2) Pa).(II) Phase equilibria of the MnO-SiO2-CrOx ternary system were measured for P-O2 = 2 x 10(-6) Pa. Finally, the change in composition of inclusions during this process with increasing silicon addition was examined by using the determined phase diagram of this ternary system.