Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1973-08-22
1976-03-09
Tupman, W.
Metal working
Method of mechanical manufacture
Assembling or joining
136233, B01J 1700
Patent
active
039422429
ABSTRACT:
A thermocouple structure useful for high temperature applications comprises a pair of thermocouple wires joined at one end to form a thermocouple, the wires being enclosed within a metallic sheath which is open at one end. The thermocouple and the wires within the sheath are surrounded and insulated by crushed compacted magnesium oxide. The end of the sheath from which the thermocouple wires extend is filled with ceramic cement to seal the crushed magnesium oxide and the wires therein. The thermocouple structure is prepared by inserting stripped thermocouple wires into a cylindrical two-hole perforated magnesium oxide preform and the resulting assembly placed within a metal sheath. The resulting assembly is then swaged or reduced in diameter to crush and compact the magnesium oxide therein. The resulting swaged assembly is opened, if desired, to expose the ends of the wires which are then welded to form a thermocouple. High temperature ceramic cement is then employed to insulate the thermocouple and that end of the sheath welded shut. Ceramic cement is placed in the other end of the sheath to seal the crushed magnesium oxide and wires therein.
REFERENCES:
patent: 3314129 (1967-04-01), Pugh
patent: 3477122 (1969-11-01), Hamrick
Engelhard Minerals & Chemicals Corporation
Tupman W.
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