Process for manufacturing a thermally and/or electrically conducting solid

A process for manufacturing a thermally and/or electrically conducting solid, in which:

• at least one doped aqueous dispersion is prepared, said dispersion comprising a mica powder and at least one dopant powder, which powders are dispersed in a non-ionic aqueous liquid, each dopant being chosen from the graphites, with the exception of unexpanded expandable graphites, the mica representing at least 5 wt. % of the solid matter of the dispersion, the dopant(s) representing from 1 wt. % to 95 wt. % of the solid matter of the dispersion, the proportion of each dopant being chosen in dependence on the desired thermal and electrical conductivities,
• each doped aqueous dispersion undergoes a forming operation, the proportion by weight of solid matter in the dispersion having been chosen so as to obtain, for the doped aqueous dispersion, a viscosity compatible with the forming technique used,
• the doped aqueous dispersion is allowed to consolidate in terms of form, by evaporation at least of the aqueous phase of the dispersion liquid at a temperature below 80° C., in particular at ambient temperature.