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2 2019

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Wyznaczanie przewodności cieplnej ciał stałych na podstawie normy ASTM D 5470

Buliński Zbigniew, Pawlak Sebastian, Białecki Ryszard, Adamczyk Wojciech, Krysiński Tomasz

Stal, Metale & Nowe Technologie

2019

nr 3-4

57--62

W artykule przedstawiono procedurę wyznaczania przewodności cieplnej ciał stałych w oparciu o wytyczne normy ASTM D 5470, stosując oryginalne stanowisko badawcze własnej konstrukcji. W prezentowanym eksperymencie materiałem do badań była stal austenityczna odporna na korozję gatunku X5CrNi18-10 (EN 1.4301). Na podstawie zarejestrowanych wartości temperatury w stanie ustalonym oraz wyznaczonego strumienia ciepła obliczono przewodność cieplną badanego materiału.

This paper presents the procedure for the determination of the thermal conductivity of solids according to the ASTM D 5470 standard, using an original self-designed apparatus. This method is mainly applied for measuring thermal contact resistance and the thermal conductivity of thermal interface materials (TIMs). In the presented experiment, the specimens were made of the AISI 304 (EN 1.4301) austenitic stainless steel. From the recorded temperature values in steady-state heat transfer conditions and determined heat flux, the thermal conductivity of the tested material was calculated.

Application of the ASTM D5470 standard test method for thermal conductivity measurements of high thermal conductive materials

Buliński Z., Pawlak S., Krysiński T., Adamczyk W., Białecki R.

Journal of Achievements in Materials and Manufacturing Engineering

2019

Vol. 95, nr 2

57--63

Purpose: The purpose of the present study was to demonstrate the procedure for determining the thermal conductivity of a solid material with relatively high thermal conductivity, using an original self-designed apparatus. Design/methodology/approach: The thermal conductivity measurements have been performed according to the ASTM D5470 standard. The thermal conductivity was calculated from the recorded temperature values in steady-state heat transfer conditions and determined heat flux. Findings: It has been found from the obtained experimental results that the applied standard test method, which was initially introduced for thermal conductivity measurements of thermal interface materials (TIMs), is also suitable for materials with high thermal conductivity, giving reliable results. Research limitations/implications: The ASTM D5470 standard test method for measurement of thermal conductivity usually gives poor results for high conductive materials having thermal conductivity above 100 W/mK, due to problems with measuring heat flux and temperature drop across the investigated sample with reasonably high accuracy. Practical implications: The results obtained for the tested material show that the presented standard test method can also be used for materials with high thermal conductivity, which is of importance either for the industrial or laboratory applications. Originality/value: The thermal conductivity measurements have been carried out using an original self-designed apparatus, which was developed for testing broad range of engineering materials with high accuracy.