Thermoisolation.

The other perspective field of carbon-carbon composites (CCC) usage is thermoisolation elements. It should be mentioned that traditional carbon-carbon materials have the coefficient of linear thermal expansion in the direction perpendicular to the fabric layers in ~4 times less than industrial graphites. Besides that, it is possible to create special low-density carbon-carbon materials for thermoisolation. One of these direction is the creation of tri-compound CCC with the additions of thermal expanded graphites, densification of preforms from thermal expanded graphites, TIB and etc. These materials combine high mechanical strength and thermoisolation features.

The other way  is the creation of the thermoisolating elements on the basis of the carbon felts. Picture shows such construction that is used in the monocrystal growing facilities. A profiled stratum of a carbon felt is reeled up on a thin-walled carbon-carbon shell and covered by a carbon fabric. Such construction has good mechanical strength (ensured by the thin-walled carbon-carbon shell), high resistance to the silicon vapors and proper thermoisolation features.