MECHANICAL RELIABILITY AND THERMOELECTRICAL STABILITY OF NOBLE-METAL THERMOCOUPLES AT 2600F TEMPERATURE AND DOSE RATES UP TO 10 TO 20 POWER NVT.

Abstract

Reactor tests during the test program demonstrated that the following were accomplished: (1)Alumina Flame spray-coating of sheath-type noble-metal thermocouples prevented excessive loss of the noble-metal sheath and sensor wire by vaporization and redeposition on cooler surfaces in reactor tests at operating temperatures of 2500F to 2600F; (2)The use of an alumina-coated, noble-metal bare-wire thermocouple (Span thermocouple) employing a controlled, maximum, feasible separation between sensor wire and/or an alumina-coated thermocouple constructed of two one-conductor coaxial, sheathed thermoelements (Duax thermocouple) insured that temperature information, which will not be affected by significant decalibration, can be obtained for a period of 1000 hours at a test temperature of 2600F. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1964
Accession Number
AD0601267

Entities

People

  • Alfred C. Dallman

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Critical Temperature
  • Dose Rate
  • Glass Transition Temperature
  • Reliability
  • Thermal Spraying
  • Thermocouples
  • Transition Temperature
  • Vaporization

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Thermal Physics or Thermal Science.