The Growth Process and Technology of Cultivating Diamonds
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1. The growth process of natural diamonds
Natural diamonds are formed in the carbon layer more than F00 kilometers underground, where the ultra-high temperature and pressure environment can compress graphite shaped carbon elements into diamond structures. The formation of a natural diamond often takes millions of years of crustal movement, followed by volcanic eruptions reaching the Earth's surface to become a diamond that can be mined.
2. Methods for Cultivating Diamonds
a. High Temperature High Pressure (HPHT) Diamond Cultivation Technology
HIGH PRESSURE HIGH TEMPERATURE TECHNOLOGY, as the first generation diamond growth technology, fully simulates the growth process of natural diamonds using high-temperature and high-pressure technology, reproducing the reaction of carbon layers on the ground and converting graphite into diamonds. During the cultivation process of HPHT diamonds, pure carbon powder is compressed into a growth capsule and then placed in a cultivation chamber. At extremely high temperatures (up to 1300-1600 ° C) and pressures, carbon atoms are linked together day after day to form diamond crystals. Fully simulate the growth process of natural diamonds to obtain cultivated diamonds.
b. Chemical Meteorological Deposition (CVD) Technology for Cultivating Diamonds
CVD technology is the second generation diamond growth technology, which starts with placing a diamond sheet in a vacuum chamber and filling it with a mixture of ammonia and methane gas. These gases provide carbon atoms, which are heated at a specific pressure until they are heated. Carbon atoms deposit layer by layer on the sheet, like snow, forming a uniform diamond layer that grows to a sufficient thickness, It can be used as a breeding diamond for jewelry.
Due to the good control of the growth process by CVD, scientists can form large single crystal and polycrystalline diamonds with a diameter of 4-8 inches through precise control, which have more and more important applications in sound, light, chemical, electrical, thermal, and medical fields.
