IMMERSION PYROMETER

A protective sheath for a temperature sensing device for use in determining the temperature of molten metals. The temperature sensing device, such as a thermocouple, is encased in a molybdenum tube which is coated with successive porous layers of molybdenum, a plurality of layers of Al2O3-Cr2O3-Mo i...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TADEUSZ M DRZEWIECKI, RICHARD T ELLIS, DAVID C GREENSPAN, R MICHAEL PHILLIPPI, ERNIE TOKAY, JAMES R BUSH, TAKI NEGAS
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE FURNACES HEATING KILNS LIGHTING MEASURING MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE MECHANICAL ENGINEERING OVENS PHYSICS RETORTS TESTING THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR WEAPONS
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Beschreibung
Zusammenfassung:	A protective sheath for a temperature sensing device for use in determining the temperature of molten metals. The temperature sensing device, such as a thermocouple, is encased in a molybdenum tube which is coated with successive porous layers of molybdenum, a plurality of layers of Al2O3-Cr2O3-Mo in a decreasing concentration of Mo in proceeding from the inner to the outer layers, and a layer of substantially pure Al2O3-Cr2O3. The Al2O3-Cr2O3 layer may be covered with an outer coating of a material, such as boron nitride, to protect the Al2O3-Cr2O3 layer from attack by slag. Alternating layers of Al2O3-Cr2O3 and boron nitride may be applied as outermost sacrificial layers.