Heat conductivity of pyrolytic graphite of mark UPV-1 at temperatures 1900–2950 K

Abstract

The urgency of the work is caused by that at research of heat conductivity in anisotropic materials is necessary to consider infringement of parallelism between vectors of heat flux and a gradient of temperature. In the previous works at studying heat conductivity of pyrolytic graphites techniques which were applied to isotropic graphites were used. Results of measurement of heat conductivity of pyrolytic graphite of mark UPV-1 in a direction in parallel to a plane of sedimentation are presented. The experimental samples which are heated up by an electric current, represented hollow cylinders at which the plane of sedimentation of pyrolytic graphite has been located along radius. It is offered also heat flux which defined on energy of radiation from an external surface of the sample, and a gradient of temperature to measure along radius, that is strictly in parallel each other. The comparative analysis of experimental data of heat conductivity (in parallel a plane of sedimentation), measured in the given work and resulted in literature sources is brought. The range of the investigated temperatures makes 1900–2950 K and is expanded in area of higher values on 450 K.