METHOD FOR OBTAINING NANOCRYSTALLINE CORUNDUM FROM NATURAL OR SYNTHETIC ALUMS

摘要

This invention relates to a method for obtaining nanocrystalline corundum, characterized in that it comprises a first step of heat treatment, at ordinary pressure, of the raw material used in the method, up to a temperature above that of the last endothermic accident in the log of differential thermal analysis of the raw material carried out up to 925°C; and a second step of rapid cooling from the maximum temperature reached in the preceding step down to ambient temperature. This invention also relates to the nanocrystalline corundum that may be obtained using the method described, and to many uses for said corundum. Furthermore, the material in question may be broken up, for example by high-power milling, to produce a fine dust that may be used as an abrasive or functional filler in plastic polymers or other types of material.