INSTABILITY OF REFRACTORY METAL THERMOCOUPLES.

Abstract

Thermoelectric instabilities of some refractory metal thermocouples were studied in the temperature range 1000 to 2000C under vacuum and neutral atmospheres. The sources of instability were found to complex, involving contamination from ceramic protection tubes and furnace environments, preferential volatilization, and various thermal anomalies such as recrystallization and phase changes in the refractory thermoelements. Refractory thermocouples and thermoelements were studied under a variety of conditions, and emf changes associated with each were noted. Recommendations were made for the selection and application of these thermocouples to attain maximum thermoelectric stability. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 26, 1965
Accession Number
AD0621484

Entities

People

  • B. E. Walker Jr.
  • C. T. Ewing
  • Roman R. Miller

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Atmospheres
  • Contamination
  • Critical Temperature
  • Environment
  • Glass Transition Temperature
  • Instability
  • Metals
  • Recrystallization
  • Refractory Metals
  • Thermocouples
  • Transition Temperature

Fields of Study

  • Materials science

Readers

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