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Abstract: Here we report a physicochemical investigation of low-density carbon materials modified with pyrolytic carbon (PC). Exfoliated graphite (EG) obtained by nitrate expandable graphite thermal destruction was pressed into low-density graphite materials (LDGMs) with densities of 0.045–0.50g/cm3 and saturated with PC by impact CVI technique. LDGM infiltration with PC leads to sample weight and density growth. The amount of deposited PC strictly depends on synthesis conditions. The maximum surface and volume deposition of PC occurred for samples with density of 0.05g/cm3. XRD, Raman spectroscopy and scanning electron microscopy revealed that the deposited PC is of smooth laminar (SL) type. Composite thermal conductivity is about 2–3.5Wt/mK. [Copyright &y& Elsevier]

Abstract: Electrical and thermal properties of binary systems consisted of stearine and expanded graphite (EG) of different bulk densities (0.003 and 0.4g/cm3), stearine and fine-crystalline graphite (CG) were examined. Heat capacity measurements display that phonon spectrum of graphite does not change after chemical and heat treatment in the temperature range from 300 to 700K. It was shown that the value of samples’ percolation threshold depends on aspect ratio of using the electroconducting filler: EG as electroconducting filler is 20 times more effective than common crystal graphite. [Copyright &y& Elsevier]