METHOD OF PREPARING FINE CRYSTALLINE CORUNDUM Russian patent published in 1997 - IPC

FIELD: manufacture of fine crystalline corundum. SUBSTANCE: according to first variant, fine crystalline corundum is prepared by thermocouple treatment of aluminium hydroxide at 350-400 C and pressure of 30-40 atm in the presence of 1-20 wt % additive such as mechanically activated aluminium oxide or fine crystalline corundum prepared by thermocouple treatment of mechanically activated aluminium hydroxide. According to second variant, aluminium hydroxide, in combination with additive such as 1-20 wt % aluminium oxide, is subjected to mechanical treatment and the mechanically treated mixture is then subjected to thermocouple treatment at 350-400 C and pressure of 30-400 atm. EFFECT: more efficient preparation process. 3 cl, 3 tbl