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Graphite as a Standard Reference Material

  • J. G. Hust

Abstract

The Cryogenics Division (Boulder, Colorado) in conjunction with the Office of Standard Reference Materials (Gaithersburg, MD) of the National Bureau of Standards has been investigating graphite as a potential, extended temperature range, Standard Reference Material (SRM). A large number of isotropic, fine-grained graphite rods in various diameters have been obtained for homogeneity and stability investigations. Electrical resistivity and density measurements have been performed on numerous rods at temperatures from 4 to 300 K. Thermal conductivity measurements have been performed on thirteen specimens at about 20°C. These measurements show that transport property variations both between and within these rods is relatively large (approximately 10%). However, a correlation between these variables is shown to exist which will allow the calculation of thermal conductivity from simple and inexpensive electrical resistivity and density measurements to within about ± 2%.

Keywords

Thermal Conductivity Electrical Resistivity Standard Reference Material Thermal Conductivity Measurement Advisory Report 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    E. Fitzer, Thermophysical Properties of Solid Materials, Advisory Report 12 (1967); Advisory Report 38 (1972); Report 606 (1972), AGARD, NATO, France.Google Scholar
  2. 2.
    M. L. Minges, Evaluation of Selected Refractories as High-Temperature Thermophysical Property Calibration Materials, AFML Technical Report TR-73–278 (1974);Google Scholar
  3. 2a.
    M. L. Minges Int. J. Heat and Mass Transfer 17, 1365–1382 (1974).CrossRefGoogle Scholar

Copyright information

© Purdue Research Foundation 1978

Authors and Affiliations

  • J. G. Hust
    • 1
  1. 1.Institute for Basic StandardsNational Bureau of StandardsBoulderUSA

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