Thermal measuring and testing – Temperature measurement – Of molten metal
Patent
1992-10-22
1994-04-12
Cuchlinski, Jr., William A.
Thermal measuring and testing
Temperature measurement
Of molten metal
428 344, 374208, G01K 108
Patent
active
053020278
ABSTRACT:
A sight tube for an optical temperature measuring device suitable for immersion in molten steel comprises an elongated, cylindrical body having an optical sighting bore therein extending axially from an open end of the body to a closed end. The body is a carbon bonded alumina graphite material made from a mix consisting of, in weight percent, between about 5-45% graphite; between about 20-85% alumina; 0 to 15% anti-oxidant; and between about 3-20% phenolic resin binder. The mixture is isostatically pressed in the desired body shape and fired at a temperature in excess of 1400.degree. C. in a reducing atmosphere. The graphite is preferably a high purity flake graphite, greater than 99% pure. The alumina is preferably "brown" fused alumina grain having minimum amounts of volatile elements: sodium (Na), potassium (K), boron (B), phosphorous (P), sulphur (S) and chlorine (Cl). The sodium content, present as Na.sub.2 O in the alumina source is less than 0.05% by weight, and preferably no more than 0.02% by weight.
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Bennett G. Bradley
Cuchlinski Jr. William A.
Vesuvius Crucible Company
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