Orlovs'kyj V. Research of a thermodynamics and kinetics of dissolution of nitrogen in liquid high reactionary and refractory metals at high temperatures.

The thesis the activity is dedicated to analysis of interplay of nitrogen with liquid high reactionary both metals and alloys on their basis in a broad band of partial pressures of nitrogen and in the field of temperatures, close to temperatures of processes of a special electrometallurgy. By a melting metal in state of suspension method was are investigated thermodynamic and kinetic relations of dissolubility of nitrogen in liquid niobium, vanadium, zirconium, titanium and in alloys of systems Fe-V and Fe-Nb. Equilibrium concentrations of nitrogen in zirconium and titanium to reach (achieve) it was not possible since the reacting went in one party before formation of nitrides. Is registered, that the dissolubility of nitrogen in liquid vanadium and niobium, and also in alloys of systems Fe-V and Fe-Nb obeys to the Sieverts' law only at small concentrations of nitrogen in metal. With increase of the contents of dissolved gas in metal the appreciable positive deviation from the Sieverts' law is watched . On the basis of the obtained outcomes the basic thermodynamic values were counted and the extending relations of affinity constants of dissolution of nitrogen in alloys of systems iron - vanadium and iron - niobium are deduced at different temperatures. By results of researches of a kinetics of dissolution of nitrogen in liquid vanadium, niobium, zirconium and titanium was determined, that by limiting stage of reacting, which one flows past in a system metal - nitrogen, is the chemical-absorbing link in a gas phase on a surface of metal. On the basis of the obtained relations the constants of speed of chemical-absorbing process K? for different partial pressures PN2 and temperatures were determined. The increase of temperature of process results in (decreasing) forces of a chemical bond and, as a consequent, to increase K?.