Direct measurements of the thermal conductivity of various pyrolytic graphite samples (PG,TPG) used as thermal dissipation agents in detector applications

We performed model measurements on heat conduction in graphite-based structures, using several configurations. We describe our method for the direct measurement of thermal conductivity both in-plane and out-of-plane, for TPG and PG samples. Our results for the in-plane thermal conductivity coefficient, Kab were obtained with two different sets of boundary conditions; they are in good mutual agreement. Those for the transverse coefficient, Kc, differ by a significant factor from the values published by the producers of the material.