The factors affecting the thermal conductivity of ceramic composite materials based on SiC with additives B 4 C, AlN, Si 3 N 4 , Y 2 O 3 , Al 2 O 3 , HfB 2 , obtained by spark plasma sintering technology with a relative density of 99 & # 37 ;. Thermophysical properties were determined in the temperature range from 20 to 1300 ° C: heat capacity, thermal diffusivity and thermal conductivity of composites. Thermal diffusivity and heat capacity were measured by the laser flash method. The heat capacity measurements are supplemented by the results obtained by DSC and adiabatic calorimeter methods. Thermal conductivity is calculated from the data of thermal diffusivity, heat capacity and density.
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