Open AccessИсследование влияния технологических факторов на неопределенность результатов измерения теплопроводности методом лазерной вспышки
Author(s) -
Е.С. Макарова,
А.В. Асач,
И.Л. Тхоржевский,
В.Е. Фомин,
А.В. Новотельнова,
В.В. Митропов
Publication year - 2022
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2022.02.51957.30a
Subject(s) - materials science , thermal conductivity , graphite , coating , multiphysics , composite material , thermal conductivity measurement , laser , conductivity , standard deviation , optics , thermodynamics , finite element method , chemistry , physics , statistics , mathematics
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.