Method for reducing the response time in oxygen measuring probes
Assignee"Meci" Materiel Electrique de Controle et Industriel
InventorClaude Renet
Life of this patent
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Abstract
A method for reducing the response time in the measurement of the oxygen content in molten metals by means of a probe of the type comprising a solid electrolyte which produces an electromotive force depending on the ratio of the partial pressure of oxygen in the molten metal to the partial pressure of oxygen in a reference medium contained in the probe, said method comprising producing a temperature rise of the probe thereby to accelerate the establishment of thermal equilibrium with the molten metal.
Claims14
A method for reducing the response time in the measurement of the oxygen content in molten metal by means of a probe of the type comprising a solid electrolyte which produces an electromotive force depending on the ratio of the partial pressure of oxygen in the molten metal to the partial pressure of oxygen in a powdered reference medium contained in the probe, said method comprising producing a temperature rise of the probe by an exothermic oxidation-reduction chemical reaction initiated in the powdered reference medium and by the bath itself and whereof the final products of said reaction do not substantially modify the partial pressure of oxygen produced by the reference medium to thereby accelerate the establishment of thermal equilibrium with the molten metal, wherein the reference medium is a powder which contains a metal and optionally its lowest oxide and wherein added to this powder is an oxide of a metal having a lower affinity for oxygen than the metal of the reference medium in an amount so that the final products do not substantially modify the partial pressure of oxygen produced by the reference medium, and wherein the metals used are chosen from the group constituted by:
- Fe, Cu, Ni, Co, Mo, Cr, these metals being arranged in increasing order of their affinity for oxygen, the metal of the reference medium being chosen from the last four and the oxide being an oxide of any one of the metals preceding the reference metal in the list.
A method for reducing the response time in the measurement of the oxygen content in molten metal by means of a probe of the type comprising a solid electrolyte which produces an electromotive force depending on the ratio of the partial pressure of oxygen in the molten metal to the partial pressure of oxygen in a powdered reference medium contained in the probe, said method comprising producing a temperature rise of the probe by an exothermic oxidation-reduction chemical reaction initiated in the powdered reference medium and by the bath itself and whereof the final products of said reaction do not substantially modify the partial pressure of oxygen produced by the reference medium to thereby accelerate the establishment of thermal equilibrium with the molten metal, wherein the reference medium is a powder containing a metal and its lowest oxide, wherein there is incorporated in this powder a metal having a higher affinity for oxygen and an oxide of a metal having a lower affinity for oxygen than the metal of the reference medium.
A method for reducing the response time in the measurement of the oxygen content in molten metal by means of a probe of the type comprising a solid electrolyte which produces an electromotive force depending on the ratio of the partial pressure of oxygen in the molten metal to the partial pressure of oxygen in a powdered reference medium contained in the probe, said method comprising producing a temperature rise of the probe by an exothermic oxidation-reduction chemical reaction initiated in the powdered reference medium and by the bath itself and whereof the final products of said reaction do not substantially modify the partial pressure of oxygen produced by the reference medium to thereby accelerate the establishment of thermal equilibrium with the molten metal, wherein the reference medium is a powder which contains a metal and/or its lowest oxide and wherein added to this metal is a metal having a greater affinity for oxygen in an amount so that the final products do not substantially modify the partial pressure of oxygen produced by the reference medium and wherein the metal of the reference medium is Ni or Mo and the added metal is Zr or Al.
Apparatus for reducing the response time in the measurement of the oxygen content of molten metals comprising a probe which comprises a solid electrolyte adapted to produce an electromotive force depending on the partial pressure of oxygen in a molten metal and the partial pressure of oxygen in a powdered reference media in the probe and a metal or metal oxide in the reference media capable of reacting at the time of introduction of the probe into molten metal thereby to cause an exothermic oxidation-reduction chemical reaction producing a temperature rise which accelerates establishment of thermal equilibrium with the bath, and whereby the final products of said reaction do not substantially modify the partial pressure of oxygen produced by the reference medium, wherein the reference medium is a powder which contains a metal and optionally its lowest oxide and wherein added to this powder is an oxide of a metal having a lower affinity for oxygen than the metal of the reference medium in an amount so that the final products do not substantially modify the partial pressure of oxygen produced by the reference medium and wherein the metals used are chosen from the group constituted by:
- Fe, Cu, Ni, Co, Mo, Cr, these metals being arranged in increasing order of their affinity for oxygen, the metal of the reference medium being chosen from the last four and the oxide being an oxide of any one of the metals preceding the reference metal in the list.
Apparatus for reducing the response time in the measurement of the oxygen content of molten metals comprising a probe which comprises a solid electrolyte adapted to produce an electromotive force depending on the partial pressure of oxygen in a molten metal and the partial pressure of oxygen in a powdered reference media in the probe and a metal or metal oxide in the reference media capable of reacting at the time of introduction of the probe into molten metal thereby to cause an exothermic oxidation-reduction chemical reaction producing a temperature rise which accelerates establishment of thermal equilibrium with the bath, and whereby the final products of said reaction do not substantially modify the partial pressure of oxygen produced by the reference medium, wherein the reference medium is a powder containing a metal and its lowest oxide, wherein there is incorporated in this powder a metal having a higher affinity for oxygen and an oxide of a metal having a lower affinity for oxygen than the metal of the reference medium.
Apparatus for reducing the response time in the measurement of the oxygen content of molten metals comprising a probe which comprises a solid electrolyte adapted to produce an electromotive force depending on the partial pressure of oxygen in a molten metal and the partial pressure of oxygen in a powdered reference media in the probe and a metal or metal oxide in the reference media capable of reacting at the time of introduction of the probe into molten metal thereby to cause an exothermic oxidation-reduction chemical reaction producing a temperature rise which accelerates establishment of thermal equilibrium with the bath, and whereby the final products of said reaction do not substantially modify the partial pressure of oxygen produced by the reference medium, wherein the reference medium is a powder which contains a metal and/or its lowest oxide and wherein added to this metal is a metal having a greater affinity for oxygen in an amount so that the final products do not substantially modify the partial pressure of oxygen produced by the reference medium and wherein the metal of the reference medium is Ni or Mo and the added metal is Zr or Al.
Dependencies are inferred from the claim text.