TY  - JOUR
AU  - Hay, Bruno
AU  - Beaumont, Olivier
AU  - Fleurence, Nolwenn
AU  - Lambeng, Nora
AU  - Lambeng, Nora
AU  - Lorrette, Christophe
AU  - Knopp, Kevin
AU  - Hartmann, Jürgen
AU  - Beckstein, Fabia
AU  - Stobitzer, Dorothea
AU  - Milošević, Nenad
AU  - Stepanić, Nenad
AU  - Wu, Jiyu
AU  - Mildeova, Petra
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10627
AB  - An inter-laboratory comparison has been performed between seven participants on thermal diffusivity measurements by the laser flash method in the temperature range from 23 °C to 3000 °C. The main objective was to assess the variability and coherency of thermal diffusivity measurements performed at ultra-high temperatures at the European level. Three refractory materials (molybdenum, tungsten and isotropic graphite IG210) were selected for this inter-laboratory comparison, due to their high melting point. The disk-shaped specimens needed were machined from the same blocks of materials in order to reduce any potential scattering of results between participants due to inhomogeneity effects. The homogeneity of the sets of specimens was studied by the pilot laboratory (LNE) before launching the comparison process. Thermal diffusivity measurements were then carried out by the seven participants on the three materials during two successive thermal cycles up to the maximum temperatures that can be reached by the devices used. The analysis of results showed a good agreement between the participants for temperatures above 400 °C, with relative deviations within the uncertainties of measurement and lower than ± 4 % for molybdenum, ± 5 % for isotropic graphite and ± 9 % for tungsten. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
T2  - International Journal of Thermophysics
T1  - Inter-laboratory Comparison on Thermal Diffusivity Measurements by the Laser Flash Method at Ultra-high Temperature
VL  - 44
IS  - 4
DO  - 10.1007/s10765-023-03159-5
ER  - 

@article{
author = "Hay, Bruno and Beaumont, Olivier and Fleurence, Nolwenn and Lambeng, Nora and Lambeng, Nora and Lorrette, Christophe and Knopp, Kevin and Hartmann, Jürgen and Beckstein, Fabia and Stobitzer, Dorothea and Milošević, Nenad and Stepanić, Nenad and Wu, Jiyu and Mildeova, Petra",
year = "2023",
abstract = "An inter-laboratory comparison has been performed between seven participants on thermal diffusivity measurements by the laser flash method in the temperature range from 23 °C to 3000 °C. The main objective was to assess the variability and coherency of thermal diffusivity measurements performed at ultra-high temperatures at the European level. Three refractory materials (molybdenum, tungsten and isotropic graphite IG210) were selected for this inter-laboratory comparison, due to their high melting point. The disk-shaped specimens needed were machined from the same blocks of materials in order to reduce any potential scattering of results between participants due to inhomogeneity effects. The homogeneity of the sets of specimens was studied by the pilot laboratory (LNE) before launching the comparison process. Thermal diffusivity measurements were then carried out by the seven participants on the three materials during two successive thermal cycles up to the maximum temperatures that can be reached by the devices used. The analysis of results showed a good agreement between the participants for temperatures above 400 °C, with relative deviations within the uncertainties of measurement and lower than ± 4 % for molybdenum, ± 5 % for isotropic graphite and ± 9 % for tungsten. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.",
journal = "International Journal of Thermophysics",
title = "Inter-laboratory Comparison on Thermal Diffusivity Measurements by the Laser Flash Method at Ultra-high Temperature",
volume = "44",
number = "4",
doi = "10.1007/s10765-023-03159-5"
}

Hay, B., Beaumont, O., Fleurence, N., Lambeng, N., Lambeng, N., Lorrette, C., Knopp, K., Hartmann, J., Beckstein, F., Stobitzer, D., Milošević, N., Stepanić, N., Wu, J.,& Mildeova, P.. (2023). Inter-laboratory Comparison on Thermal Diffusivity Measurements by the Laser Flash Method at Ultra-high Temperature. in International Journal of Thermophysics, 44(4).
https://doi.org/10.1007/s10765-023-03159-5

Hay B, Beaumont O, Fleurence N, Lambeng N, Lambeng N, Lorrette C, Knopp K, Hartmann J, Beckstein F, Stobitzer D, Milošević N, Stepanić N, Wu J, Mildeova P. Inter-laboratory Comparison on Thermal Diffusivity Measurements by the Laser Flash Method at Ultra-high Temperature. in International Journal of Thermophysics. 2023;44(4).
doi:10.1007/s10765-023-03159-5 .

Hay, Bruno, Beaumont, Olivier, Fleurence, Nolwenn, Lambeng, Nora, Lambeng, Nora, Lorrette, Christophe, Knopp, Kevin, Hartmann, Jürgen, Beckstein, Fabia, Stobitzer, Dorothea, Milošević, Nenad, Stepanić, Nenad, Wu, Jiyu, Mildeova, Petra, "Inter-laboratory Comparison on Thermal Diffusivity Measurements by the Laser Flash Method at Ultra-high Temperature" in International Journal of Thermophysics, 44, no. 4 (2023),
https://doi.org/10.1007/s10765-023-03159-5 . .

TY  - JOUR
AU  - Hay, Bruno
AU  - Milošević, Nenad D.
AU  - Hameury, Jacques
AU  - Stepanić, Nenad
AU  - Failleau, Guillaume
AU  - Garcia, Yann
AU  - Koenen, Alain
AU  - Filtz, Jen-Remy
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9977
AB  - Institute VINCA, respectively French National Metrology Institute and Serbian Designated Institute for thermal properties metrology, on thermal conductivity measurements by the guarded hot plate method. The main objective was to validate the measurement capabilities of VINCA in terms of thermal conductivity in the temperature range from 10 degrees C to 50 degrees C by using the facility improved in the frame of the European project Eura-Thermal. The measurements were carried out on expanded polystyrene boards using guarded hot plate apparatuses (two-specimen GHP apparatuses) in accordance with the international standard ISO 8302. The measurement programme was defined taking into account the major characteristics of the guarded hot plate apparatuses used, such as specimen dimensions and temperature and thermal conductivity ranges. Specimens were machined by LNE from a same batch for both participants. Prior to the measurements, the homogeneity of the set of specimens, as well as the influence of a variation of density of the expanded polystyrene on the thermal conductivity measurements were studied by VINCA. The obtained results showed good agreement between the two laboratories, with relative deviations within the uncertainties of measurement. Also, the results validated the level of uncertainty assessed by VINCA for its thermal conductivity measurements to around 2.5 % (with a coverage factor of 2) between 10 degrees C and 50 degrees C.
T2  - High Temperatures: High Pressures
T1  - Inter-laboratory comparison on thermal conductivity measurements by the guarded hot plate method between LNE and Institute VINCA
VL  - 50
IS  - 3
SP  - 213
EP  - 231
DO  - 10.32908/hthp.v50.1001
ER  - 

@article{
author = "Hay, Bruno and Milošević, Nenad D. and Hameury, Jacques and Stepanić, Nenad and Failleau, Guillaume and Garcia, Yann and Koenen, Alain and Filtz, Jen-Remy",
year = "2021",
abstract = "Institute VINCA, respectively French National Metrology Institute and Serbian Designated Institute for thermal properties metrology, on thermal conductivity measurements by the guarded hot plate method. The main objective was to validate the measurement capabilities of VINCA in terms of thermal conductivity in the temperature range from 10 degrees C to 50 degrees C by using the facility improved in the frame of the European project Eura-Thermal. The measurements were carried out on expanded polystyrene boards using guarded hot plate apparatuses (two-specimen GHP apparatuses) in accordance with the international standard ISO 8302. The measurement programme was defined taking into account the major characteristics of the guarded hot plate apparatuses used, such as specimen dimensions and temperature and thermal conductivity ranges. Specimens were machined by LNE from a same batch for both participants. Prior to the measurements, the homogeneity of the set of specimens, as well as the influence of a variation of density of the expanded polystyrene on the thermal conductivity measurements were studied by VINCA. The obtained results showed good agreement between the two laboratories, with relative deviations within the uncertainties of measurement. Also, the results validated the level of uncertainty assessed by VINCA for its thermal conductivity measurements to around 2.5 % (with a coverage factor of 2) between 10 degrees C and 50 degrees C.",
journal = "High Temperatures: High Pressures",
title = "Inter-laboratory comparison on thermal conductivity measurements by the guarded hot plate method between LNE and Institute VINCA",
volume = "50",
number = "3",
pages = "213-231",
doi = "10.32908/hthp.v50.1001"
}

Hay, B., Milošević, N. D., Hameury, J., Stepanić, N., Failleau, G., Garcia, Y., Koenen, A.,& Filtz, J.. (2021). Inter-laboratory comparison on thermal conductivity measurements by the guarded hot plate method between LNE and Institute VINCA. in High Temperatures: High Pressures, 50(3), 213-231.
https://doi.org/10.32908/hthp.v50.1001

Hay B, Milošević ND, Hameury J, Stepanić N, Failleau G, Garcia Y, Koenen A, Filtz J. Inter-laboratory comparison on thermal conductivity measurements by the guarded hot plate method between LNE and Institute VINCA. in High Temperatures: High Pressures. 2021;50(3):213-231.
doi:10.32908/hthp.v50.1001 .

Hay, Bruno, Milošević, Nenad D., Hameury, Jacques, Stepanić, Nenad, Failleau, Guillaume, Garcia, Yann, Koenen, Alain, Filtz, Jen-Remy, "Inter-laboratory comparison on thermal conductivity measurements by the guarded hot plate method between LNE and Institute VINCA" in High Temperatures: High Pressures, 50, no. 3 (2021):213-231,
https://doi.org/10.32908/hthp.v50.1001 . .