Effect of Sample-Shape Imperfection on Uncertainty in Measurements of the Thermal-Conductivity by the Laser-Flash Method

Asach, Aleksei V.; Isachenko, G. N.; Fomin, Vladislav E.; Samusevich, K. L.; Tkhorgevskii, I. L.

doi:10.1134/s1063782619060022

Cited by 1 publication

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“…There are a number of recommendations and limitations for this method, such as the time finitude of the laser pulse [6], uneven heating of the sample, thickness, shape and opacity of the sample [7,8]. In most experiments, to ensure the greatest absorption of pulse energy by the sample and increased accuracy of the temperature rise measurements, the sample is covered with a layer of graphite.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the influence of technological factors on the uncertainty of the results of measuring thermal conductivity by the method of laser flash

et al. 2022

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The estimation of the deviation in the measurements of thermal conductivity by the laser flash method for materials with different thermal conductivity coefficients, arising due to the presence of a graphite coating on the sample and the small thickness of the sample, is carried out. A computer model of the method was created in the Comsol Multiphysics software environment. For bulk samples with a graphite coating thickness of 20 μm, the deviation is 5.5%. The thickness of bulk samples does not affect the measurement results. For materials with low thermal conductivity, a sharp increase in the deviation is observed, reaching 60%. For thermally conductive materials, the deviation is 16-18%. For thin samples less than 10 μm thick, the thickness of the graphite coating does not affect the measurement results. The decisive factor is the duration of the laser pulse. Keywords: laser flash method, thermal conductivity, relative deviation.

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Section: Introductionmentioning

confidence: 99%