Thermodynamic properties of liquid alloys systems Fe - Ni - O - Me - Si

Abstract

In the isoperabelic calorimeter at 1870 are determined partial and integral enthalpies of mixture of liquid alloys of systems Fe – Ni – O - Me and Fe – Ni – O – Me – Si, where Me – IVb-, Vb-, VIb-metals. The basis of alloy was served invars with the contents of oxygen by 0,06 %. Established, that the melts of systems Fe – Ni – O – IVb- (Vb-)-metals are characterized by strong interparticle interplay. The components of the maiden portions IVb- (Vb-)-metals in Fe – Ni – O melts are accompanied by very large exothermal effects (from – 400 up to – 1000 kJ/mol), which one considerably surpass those in double melts Fe(Ni) – Me. The subsequent portions IVb- (Vb-)-metals caused smaller allocation of a heat (in limits from – 100 up to – 30 kJ/mol), that is conditioned by a decrease of the contents of dissolved oxygen. The partial enthalpies of mixture of molybdenum and tungsten in melts Fe – Ni – O are close to those in a nickel, and for a chromium exceed them. Is rotined, that D` HSi in liquid alloys Fe – Ni – O – Mo (– 450 kJ/mol) considerably surpass that are characteristic for a nickel (– 50 kJ/mol). It is explained by interplay of silicon with the stayed dissolved oxygen in initial melts of a system Fe – Ni – O – Mo.