Thermal Conductivity Standard Reference Materials from 6 to 280K: VI. NBS Sintered Tungsten,

Abstract

Thermal conductivity, electrical resistivity, Lorenz ratio, and thermopower data are reported for two specimens of NBS sintered tungsten for temperatures from 6 to 280K. Variability of this tungsten was studied by means of electrical resistivity and residual resistivity measurements on 39 specimens. These data indicate a material variability of about plus or minus 10% in thermal conductivity at helium temperatures. Above 90K variation in thermal conductivity is only about plus or minus 1%. To reduce the uncertainty caused by specimen variation at low temperatures, characterization by residual electrical resistivity data is described. By this procedure the low temperature uncertainty is reduced to about plus or minus 3%. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
AD0775367

Entities

People

  • J. G. Hust

Organizations

  • National Institute of Standards and Technology

Tags

DTIC Thesaurus Topics

  • Conductivity
  • Low Temperature
  • Materials
  • Measurement
  • Physical Properties
  • Residuals
  • Standards
  • Thermal Conductivity
  • Tungsten
  • Uncertainty

Readers

  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.
  • Thermal Physics or Thermal Science.