< back to main site


Characterisation of the NPL Thermal Conductivity Reference Material Inconel 600

Wu, J; Morrell, R; Clark, J; Chapman, L (2021) Characterisation of the NPL Thermal Conductivity Reference Material Inconel 600. International Journal of Thermophysics, 42 (2). 28 ISSN 0195-928X

Full text not available from this repository.


Due to the depletion of the thermal conductivity reference materials, the National Physical Laboratory (NPL) has certified a new thermal conductivity reference material, NPL code 2I09 that is based on Inconel 600. This batch of material has been thermally and electrically characterised over the temperature range 100 °C to 500 °C. The primary thermal conductivity measurements used to generate the certified values were carried out in the NPL Axial Heat Flow apparatus, which is a UK national standard measurement facility. It is based on a steady-state absolute technique and is suitable for measuring specimens with thermal conductivities in the range 10 W m-1 K-1 to 240 W m 1 K-1. Comparisons were made between the reference thermal conductivity values and the derived thermal conductivity values obtained from two indirect methods based upon electrical resistivity and thermal diffusivity measurements respectively. The reference thermal conductivity values of NPL 2I09 compare with those calculated from the measurements of electrical resistivity within 2 % and those calculated from the measurements of thermal diffusivity, specific heat capacity, density and thermal expansion better than 4 %. In addition, the certified thermal conductivity values of the new batch of Inconel 600, the NPL code 2I09 were compared with the representing reference thermal conductivity values of Inconel 600 reported by J Clark and R Tye and the agreement is within 2 %.
The new reference material NPL 2I09 is available from NPL and can be used to calibrate or check apparatuses that provide measurements of thermal conductivity from 14 W m-1 K-1 to 22 W m-1 K-1 covering the temperature range 100 °C to 500 °C. The overall uncertainty on the certified values is estimated to be within ±4.8 %, based on a standard uncertainty multiplied by a coverage factor k = 2, providing a level of confidence of approximately 95 %.

Item Type: Article
Keywords: Axial Heat Flow Apparatus, Thermal Conductivity, Reference Material, Inconel 600, Thermal Diffusivity, Specific Heat, Electrical Resistivity
Subjects: Advanced Materials > Thermal Performance
Divisions: Engineering
Identification number/DOI: 10.1007/s10765-020-02776-8
Last Modified: 18 May 2021 14:24
URI: http://eprintspublications.npl.co.uk/id/eprint/9144

Actions (login required)

View Item View Item