Thermocouples of enhanced stability

Details Thermocouples of enhanced stability Thermocouples of enhanced stability

1987-10-26

1989-05-30

Lusignan, Michael

Stock material or miscellaneous articles

Composite

Of metal

136230, 136233, 136234, 148 203, 148286, 420443, C23C 1806, C23C 1100

Patent

active

048348074

ABSTRACT:
A process for oxidation retardation in nickel-base thermocouple alloy comprises the step of initial heat-treatment of thermoelement wires at high temperatures in an atmosphere of very low oxygen partial pressure. The preferred nickel-base alloy is a type K or a type N alloy. The preferred atmosphere is a gas mixture selected from the group consisting of hydrogen/water vapour, and oxygen/argon.

REFERENCES:
patent: 4481043 (1984-11-01), Steeves et al.
Journal of Vacuum Science & Technology A, vol. 4, No. 4, Jul./Aug. 1986, Second Series, pp. 1866-1874, Woodbury, N.Y. US N.S. McIntyre et al.: "Studies of initial oxidation of nickel-chromium alloys: surface annealing by hydrogen ion bombardment."
ISA Transactions, vol. 18, No. 4, 1979, pp. 83-99, Pittsburgh, US T. P. Wang et al.: "Nicrosil-nisil thermocouples in production furnaces in the 538.degree. C. (1,000.degree. F.) to (1,177.degree. C.) (2,150.degree. F.) range."
Research Disclosure, Nov. 1984, No. 247, p. 522, abstract 24706 "Thermocouples."

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