Thermal conductivity of structural carbon materials

Materials considered as options for thermonuclear fusion are analysed among which are: anisotropic high-density ones, low-anisotropy, carbon-carbon composition and borated graphites RG-B and USB-15. It is shown that in non-irradiated graphite material the thermal conductivity is reduced with temperature growth at a rate depending on coherent scattering region sizes. The achieved thermal conductivity level is mainly determined by the material porosity: the high the porosity, the lower is the level. For graphites irradiated at high temperature (>1000 K) these regularities are preserved. 22 refs., 9 figs., 3 tabs