METHOD FOR MEASUREMENT OF OXYGEN THERMODYNAMIC ACTIVITY IN MOLTEN LIQUID METALS Russian patent published in 2016 - IPC G01N27/411 

FIELD: metallurgy.

SUBSTANCE: invention provides the method for determining thermodynamic oxygen activity in molten metals using a solid electrolyte sensor with a sensing element made from oxygen-ion conductive ceramic, the method envisages immersing into molten metal of solid electrolyte sensor; measuring the electromotive force of the sensing component of solid electrolyte sensor and temperature of molten metal and determining based on measured readings the thermodynamic oxygen activity in the molten metal; thus into the analyzed melted metal at least two solid electrolyte sensors are immersed with a reference electrode made of materials with different oxygen contents; before determining thermodynamic oxygen activity the potential difference between the reference electrodes is measured, at least one pair of solid electrolyte sensors to fulfill the terms of its permanence within the absolute measurement error and one of the solid electrolyte sensor in the pair for which the condition of constancy of potential difference between the electrodes is determined; determining thermodynamic activity of oxygen based on the ratio, the measurement of temperature of molten metal is carried out continuously and simultaneously with the measurement of electromotive force of sensing element of solid electrolyte sensor.

EFFECT: technical result provides possibility of accurate information determining concerning oxygen thermodynamic activity in molten metal.

1 cl, 1 dwg