Heat transport properties of tungsten, alumina, and polycrystalline graphite up to 27000K

Direct electrical heating methods to determine thermal conductivity avoid the uncertainty of specific heat data, have an accuracy of +- 3 to 4 percent at 25000K and are an alternative for diffusivity measurements at high temperature. Their use is limited to electrically conducting materials. For some pure metals or polycrystalline graphite, low-temperature data can be extrapolated to higher temperature