Production methods
At 2300 ℃, 15 to 180000 atmospheres of high temperature and high pressure environment, in the center of a small natural diamond as a seed, in the kind of drill is surrounded by high temperature metal liquid, on the upper deck of the molten metal is graphite, in such an environment the carbon atoms in graphite can marched toward the diamond out of metal atoms to form new diamond. The Russian group halted research on artificial diamonds after the end of the cold war because of funding problems, and later recovered with funding from U.S. jewelers. In 2005 America's synthetic diamond production line had a capacity of 5 carats an hour. Recently, Russian scientists have developed artificial diamonds with diameters of around 3mm that are completely consistent with the structure of natural diamond crystals. It is believed that with the deepening of research, artificial diamonds like natural diamonds can be made in the near future.
synthesis method
1. The high temperature and high pressure synthesis: temperature and pressure is still a two key factors of manufacturing crystal, jewelry professionals is introduced, the method is made in a ceramic container rather than the underground diamond, provide high pressure hydraulic, electric power to produce high temperature, carbon around 1 mm in diameter, made of natural diamond seed crystal to form a crystal.
2. Chemical vapor deposition synthesis: make the gas and nitrogen gas when heated, the size of a dishwasher in the pressure chamber formed a kind of carbon plasma, the plasma deposition on the carbon layer at the bottom of the pressure chamber continuously, and gradually accumulate and hardening, resulting in a laminate type of diamond, and then cut into gem shape.
