DIAMOND MONOCRYSTAL SYNTHESIS METHOD Russian patent published in 1995 - IPC

FIELD: technique of making large size monocrystals of diamond. SUBSTANCE: method comprises steps of assembling a growing cell by using as its main components a carbon dissolver, being an alloy (сплав Fe₄₆Ni₄₂C₁₂); a carbon source, being diamond grains with size no less, than 100 micrometers, impregnated by nickel in vacuum at 1773 K; a seed system, being five seeds, oriented by their cubic face towards the dissolver, and a barrier layer, separating the seed system from the dissolving alloy, placing such cell to a high pressure apparatus and providing necessary pressure and temperature in it. Parameters of thermobaric curing being 5,9 GPa and 1673 K respectively; time interval of curing 12 hours. After curing the heating source is being deenergized, and grown diamond crystals, having yellow lemon color and dimension 1.3-15 mm, are being removed from the cell for growing crystals by chemical treatment way. Heat conductance of diamond monocrystals, had been grown, consists 1600-1800 Wt(mK); heat resistance (1673-1773)K. EFFECT: increased heat conductance and heat resistance of diamond monocrystals. 3 cl, 1 tbl