Method of making a thermocouple and so-made thermocouple

Details Method of making a thermocouple and so-made thermocouple Method of making a thermocouple and so-made thermocouple

1987-08-04

1988-10-18

Nelson, Peter A.

Batteries: thermoelectric and photoelectric

Thermoelectric

Processes

136232, 136233, 136242, H01L 3534

Patent

active

047785373

ABSTRACT:
To make a jacketed thermoelement, two metal wires, one of which is pure platinum, preferably of at least 99.9, and even higher purity, and the other being a platinum/rhodium alloy are included in a ceramic element. The wires are first threaded into capillary openings of a cylindrical ceramic element which is jacketed by a jacket of platinum-rhodium alloy or INCONEL (TM). The initial assembly is hammered, thereby crashing the ceramic, and drawn to reduce the outer diameter of the metal jacket tube to fit the inner diameter of an auxiliary tube, for example of a copper-tin alloy which is fitted over the metal jacket tube. The thus formed composite is then passed through a sequence of drawing dies, preferably in a single drawing pull, in which each die reduces the cross-section by about 9-10%, until the desired outer diameter of the metal jacket tube (4) is reached; this diameter may be in the order of 0.3 mm, after starting with an outer diameter of just under 5 mm. The two wires (2,3) should have approximately the same hardness, the metal jacket (2,4) should have at least 1.5 times the hardness of the wires, and the auxiliary tube, which is later-on etched away, should have a hardness approximately in the same order as that of the jacket tube (4). The composite assemblies preferably annealed, at over 700.degree. C. after drawing through the respective drawing dies.

REFERENCES:
patent: 4175438 (1979-11-01), Wenzl et al.
patent: 4238957 (1980-12-01), Bailey et al.
patent: 4277886 (1981-07-01), Bauer et al.
patent: 4278828 (1981-07-01), Brixy et al.
patent: 4477687 (1984-10-01), Finney
patent: 4724428 (1988-02-01), Brown, Jr.
"Mantel-Thermoelemente"-VDI Betrichte Nr.112, 1966, p. 95.
"Elektrotechnik" 52, H. 4,18,02.70 pgs. 16 and 17.

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