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Title: Protective sheath for a continuous measurement thermocouple

Abstract

Disclosed is a protective thermocouple sheath of a magnesia graphite refractory material for use in continuous temperature measurements of molten metal in a metallurgical ladle and having a basic slag layer thereon. The sheath includes an elongated torpedo-shaped sheath body formed of a refractory composition and having an interior borehole extending axially therethrough and adapted to receive a thermocouple. The sheath body includes a lower end which is closed about the borehole and forms a narrow, tapered tip. The sheath body also includes a first body portion integral with the tapered tip and having a relatively constant cross section and providing a thin wall around the borehole. The sheath body also includes a second body portion having a relatively constant cross section larger than the cross section of the first body portion and providing a thicker wall around the borehole. The borehole terminates in an open end at the second body portion. The tapered tip is adapted to penetrate the slag layer and the thicker second body portion and its magnesia constituent material are adapted to withstand chemical attack thereon from the slag layer. The graphite constituent improves thermal conductivity of the refractory material and, thus, enhances the thermal responsivenessmore » of the device.« less

Inventors:
 [1]
  1. Highland, MD
Issue Date:
Research Org.:
EG & G IDAHO INC
OSTI Identifier:
868079
Patent Number(s):
5069553
Assignee:
Vesuvius Crucible Company (Pittsburgh, PA)
DOE Contract Number:  
AC07-76ID01570
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
protective; sheath; continuous; measurement; thermocouple; disclosed; magnesia; graphite; refractory; material; temperature; measurements; molten; metal; metallurgical; ladle; basic; slag; layer; thereon; elongated; torpedo-shaped; formed; composition; interior; borehole; extending; axially; therethrough; adapted; receive; closed; forms; narrow; tapered; tip; portion; integral; relatively; constant; section; providing; wall; larger; thicker; terminates; penetrate; constituent; withstand; chemical; attack; improves; thermal; conductivity; enhances; responsiveness; device; protective sheath; layer thereon; extending axially; thermocouple sheath; relatively constant; temperature measurements; refractory material; thermal conductivity; molten metal; chemical attack; temperature measurement; slag layer; basic slag; temperature measure; continuous temperature; continuous measurement; constituent material; /374/136/164/266/

Citation Formats

Phillippi, R Michael. Protective sheath for a continuous measurement thermocouple. United States: N. p., 1991. Web.
Phillippi, R Michael. Protective sheath for a continuous measurement thermocouple. United States.
Phillippi, R Michael. Tue . "Protective sheath for a continuous measurement thermocouple". United States. https://www.osti.gov/servlets/purl/868079.
@article{osti_868079,
title = {Protective sheath for a continuous measurement thermocouple},
author = {Phillippi, R Michael},
abstractNote = {Disclosed is a protective thermocouple sheath of a magnesia graphite refractory material for use in continuous temperature measurements of molten metal in a metallurgical ladle and having a basic slag layer thereon. The sheath includes an elongated torpedo-shaped sheath body formed of a refractory composition and having an interior borehole extending axially therethrough and adapted to receive a thermocouple. The sheath body includes a lower end which is closed about the borehole and forms a narrow, tapered tip. The sheath body also includes a first body portion integral with the tapered tip and having a relatively constant cross section and providing a thin wall around the borehole. The sheath body also includes a second body portion having a relatively constant cross section larger than the cross section of the first body portion and providing a thicker wall around the borehole. The borehole terminates in an open end at the second body portion. The tapered tip is adapted to penetrate the slag layer and the thicker second body portion and its magnesia constituent material are adapted to withstand chemical attack thereon from the slag layer. The graphite constituent improves thermal conductivity of the refractory material and, thus, enhances the thermal responsiveness of the device.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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