Synthesizing diamonds, comprises mixing solid, fine carbon of specific modification or several modifications, and optionally with catalyst, pressing the mass into body, sintering, carrying out uniaxial pressing, and cooling sintered body

摘要

Synthesizing diamonds, where solid carbon is exposed to high pressure and high temperature, comprises (i) mixing the solid, fine carbon of specific modification or several modifications with each other, and optionally with catalyst, (ii) pressing the mass into body, and introducing into chamber for field- and pressure-aided sintering processes with pulsed current, (iii) sintering with a current of 1000 A, at a low direct voltage and a pulse rate of millisecond, (iv) carrying out uniaxial pressing, during sintering, (v) cooling sintered body, washing in acid bath then using water, and drying. Synthesizing diamonds, where solid carbon is exposed simultaneously to a high pressure and a high temperature, comprises (i) mixing the solid, fine carbon of a specific modification or several modifications with each other, and optionally with a catalyst, (ii) pressing the mass into a body, and introducing into a chamber for field- and pressure-aided sintering processes with pulsed current, that utilizes on-off controlled direct current supply, (iii) sintering with a current of 1000 A at a low direct voltage and a pulse rate of millisecond, such that the temperature of the body is increased to 1000[deg] C, (iv) simultaneously carrying out uniaxial pressing at 10-100 Mpa, during the sintering under vacuum or protective gas atmosphere, (v) cooling the sintered body for some time, washing in an acid bath then washing using water, and drying in an oven.