Abstract:
A a process as well as an immersion sensor for measuring an electrochemical activity of a layer lying on a melt is provided, using an electrochemical sensor, which has a measuring cell and a counter electrode. In order to make possible reliably reproducible and accurate measurements in the layer, the measuring cell and counter electrode are first immersed in the melt, wherein the measuring cell and counter electrode are protected from contact with the layer and wherein the measuring cell and counter electrode are brought into contact with the melt and are heated. After that, the measuring cell is pulled up to perform the measurement in the layer, wherein the counter electrode is located in the melt during the measurement. For this purpose, the measuring cell and the counter electrode have a protective cover, and the measuring cell is arranged, in the immersion position of the sensor, above the counter electrode.
Abstract:
An oxygen measuring probe for use with molten metal baths for the manufacture of glass which probe comprises a probe body (4) comprising an elongate tubular member (6) closed at one end by a separate tip part (8) formed of stabilised zirconia which constitutes a solid electrolyte through which oxygen ions can pass, said tubular member (6) being formed of a heat-resistant material different from said zirconia, a first electrode (16) connected to the inner surface of the zirconia tip part (8), earthing means adapted for connection to earth out of contact with the molten metal and voltage measuring means (24) connected between the first electrode (16) and said earthing means (26).
Abstract:
A probe for measuring the concentration of an impurity in molten iron is disclosed. The probe comprises three sensors. The first sensor measures the activity of the impurity element directly. The second sensor measures the activity of free oxygen. The third sensor measures carbon content. These values are used are used to give a compensated measure of the impurity element.
Abstract:
A probe is provided for determining the amount of dissolved gas, (e.g. oxygen) in a molten metal (e.g. steel). It includes a disposable tip including three essential elements. The first element is a solid electrolyte which retains its ionic conduction properties and which does not exhibit substantial electronic conduction properties at the temperature of the molten metal. The electrolyte is a compact which has been individually formed by a technique which includes first pressure compacting and then sintering a free flowing mixture of the solid electrolyte and a suitable fugitive binder and preferably also a small amount of a suitable high temperature binder. The second element is a heatresistant, substantially electrically non-conductive tube. The compact, which has a relative density, of about 70 percent, and which has an axial depression therein, is disposed and secured at one open end of the heat-resistant tube. The third element is at least one electrically conductive metallic element in intimate electrical contact with the electrolyte. Preferably, the disposable tip includes, and is disposed in, a fourth element, namely a plug which is formed of heat-resistant, substantially electrically non-conductive material, the plug being provided with a longitudinally extending aperture therethrough. Preferably also, the tip includes a fifth element, namely a tube formed of a structurally rigid, electrically conductive metal which secures the plug in one of its open ends. The tube has a major portion of its length non-degradable in the molten metal being tested. The tip is associated with a structurally rigid, heat-resistant, electrically conductive lance, to provide a mechanical assembly of the probe tip and the lance so that a component of the lance then is also in electrical contact with the electrically conductive metallic element which is in intimate electrical contact with the solid electrolyte, and also to provide the connection to a source of the reference gas.
Abstract:
A DEVICE FOR MEASURING OXYGEN CONTENT OF FLUIDS AT ELEVATED TEMPERATURE COMPRISES A GALVANIC CELL WITH A SOLID OXIDE ELECTROLYTE AND A REFERENCE ELECTRODE OF A MIXTURE OF CHROMIUM OR AN ALLOY THEREOF AND CR2O3. WHEN THE FLUID, ACTING AS THE OTHER ELECTRODE, CONTACTS THE ELECTROLYTE, THE RESULTING EMF INDICATES OXYGEN CONTENT. PROVISION IS
ALSO MADE FOR SIMULTANEOUS TEMPERATURE DETERMINATION AND FOR ELECTRICAL CONTACT WITH FLUIDS, SUCH AS LIQUID STEEL.
Abstract:
Apparatus for the continuous measurement by immersion of oxygen contained in a molten metal which includes solid oxygen electrolyte rod or strip; reference electrode having known oxygen potential; means for measuring the electrochemical potential present between the reference electrode and the metal which is to be tested; a protective tube surrounding the electrolyte; and wherein the electrolyte is held in the end of the tube by means of an oxide cement.
Abstract:
Method and apparatus for continuously measuring the oxygen and carbon contents of a molten metal, particularly of iron in a BOF furnace. A wire containing as a component a metal which is a getter for oxygen continuously fed into the melt. A concentration cell is established and the EMF developed is used as a measure of oxygen content. Carbon content is a function of the reciprocal of the oxygen and is calculated therefrom. Automatic control over the oxygen feed results in automatic control over the carbon content. When the EMF of the cell is temperature dependent, means are incorporated for simultaneously measuring the melt temperature.
Abstract:
A system and method for the high temperature in-situ determination of corrosion characteristics of a molten metal on an alloy under study is provided which takes place within an insulated furnace. A graphite crucible provided in the furnace contains an electrolyte formed from a molten salt of a metal halide. A reference electrode formed from the same metal as the electrolyte is immersed in the electrolyte solution in the graphite crucible. A beta-alumina crucible containing a molten metal is also provided within the furnace and preferably within the graphite crucible. A measuring electrode formed from the alloy under study is immersed in the molten metal. Standard electrochemical techniques are used to measure and analyze the electrochemical effects of corrosion of the molten metal on the alloy.
Abstract:
A continuous oxygen content monitor has a reference electrode embedded in a powdered chrome-chrome-oxide mixture and a counter electrode embedded in an elongate alumina-graphite sleeve which acts as the probe support body. Two hallow and spacer ablative steel domes encase the reference electrode and an intermediate air gap spacing and provide insulation to prevent thermal shock from damaging the monitor during insertion into the metal melt. A circuit provides counter emf across the sensing electrodes to prevent ion depletion of the reference material.