ИСТИНА

The application of expanded graphite as a media for heat distribution seems to be very attractive nowadays. The correlation between thermal conductivity and bulk density of expanded graphite and materials made of it are known and described [1-2]. Besides some other characteristics, such as porosity, could affect thermal properties of expanded graphite. In this study, graphite materials with densities of 0.1…1.5 g/cc were prepared using expanded graphite with various surface areas (10…160 m2/g) and bulk densities (1.5…5 g/l). Porous structure of graphite materials was studied by liquid nitrogen adsorption, thermal capacity was determined using DCS and temperature conductivity – laser flash analysis. Our results show that the materials with high values of surface area has lower thermal conductivity. Highly porous expanded graphite remains relatively high residual porosity even in graphite materials with a density of 1.5 g/cc. The correlation between the amount of amorphous carbon, porosity and thermal conductivity of graphite materials was found. The work was carried out with a financial support of Russian Ministry of Science and Education. Agreement 14.579.21.0028.