METHOD AND REACTOR FOR SYNTHESIS OF DIAMOND MONOCRYSTALS Russian patent published in 1998 - IPC

FIELD: synthetic diamonds. SUBSTANCE: invention relates to diamond monocrystal synthesis from low-molecular carbon-containing compounds at high temperatures in heterogeneous silicate media. Reactor contains casing made in the form of shell with cover and bottom, batch loading unit, reaction products' drain unit, carbon-containing compounds' supply unit, cooling heat exchanger, and gaseous reaction products' outlet pipe. Reactor may be provided with at least one diamond monocrystal fixing unit. Batch with specified composition is portionwise loaded into casing through loading unit, heating unit is switched on, and batch is heated to 800-1450 C, while simultaneously, hydrocarbon substances are introduced through hydrocarbon loading unit into heterogeneous medium formed, their intake being from 0.001 to 3% based on batch weight per 1 min. heterogeneous medium formed is cooled in heat exchanger to 650-1050 C to form diamond monocrystals, including those with high carat number. Nitrogen and nitrogen- containing low-molecular compounds can also be introduced into heterogeneous medium formed with intake from 0.001 to 2 wt % per 1 min through hydrocarbon loading unit. When supplemented with III or V group elements, batch gives rise to synthesizing nitrogen-containing diamond monocrystals or diamond monocrystals with semiconductor properties. Method may also be performed when fixing diamonds by way of orienting combs of diamond monocrystal fixing unit into horizontal position - growing monocrystals are retained by comb until they have stable characteristics. EFFECT: provided conditions for growing diamond monocrystals with high carat number. 12 cl, 4 dwg, 1 tbl