Thermal conductivity of reference solid materials

M. J. Assael, K. Gialou, K. Kakosimos, I. Metaxa

Research output: Contribution to journalArticle

29 Citations (Scopus)


The thermal conductivity of three thermal-conductivity reference materials, Pyrex 7740, Pyroceram 9606, and stainless steel AISI 304L, has been studied. The technique employed is the transient hot-wire technique, and measurements cover a temperature range from room temperature up to 570 K. The technique is applied here in a novel way that eliminates all remaining contact resistances. This allows the apparatus to operate in an absolute way. The method makes use of a soft silicone paste material between the hot wires of the technique and the solid of interest. Measurements of the transient temperature rise of the wires in response to an electrical heating step in the wires over a period of 20 μs up to 20 s allow an absolute determination of the thermal conductivity of the solid, as well as of the silicone paste. The method is based on a full theoretical model with equations solved by a two-dimensional finite-element method applied to the exact geometry. At the 95% confidence level, the standard deviation of the thermal conductivity measurements is 0.1% for Pyrex 7740, 0.4% for Pyroceram 9606, and 0.2% for stainless steel AISI 304L, while the standard uncertainty of the technique is less than 1.5%.

Original languageEnglish
Pages (from-to)397-408
Number of pages12
JournalInternational Journal of Thermophysics
Issue number2
Publication statusPublished - 1 Mar 2004



  • AISI 304L
  • Pyrex 7740
  • Pyroceram 9606
  • Thermal conductivity
  • Transient hot wire

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this