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On April 20th, the reporter saw in the company that after only 20 minutes of high-pressure, high-temperature synthesis, a piece of gray-black graphite magically turned into a synthetic diamond with a diameter of 6mm and glittering. Wang Yuchang, the director of the company's technical center, told reporters: "This is currently the largest single crystal synthetic diamond in China. Its synthetic technology not only fills the domestic gap, but also reaches the international advanced level."
Since the 1970s, the international diamond industry represented by American GE has begun to develop the synthesis technology of single crystal synthetic diamond. At present, single crystal diamond with a diameter of 10 mm can be synthesized. The Chinese industry has also carried out research on the synthesis of single crystal diamonds. The Chinese Academy of Sciences has synthesized single crystal diamonds with a diameter of 4 mm. However, due to technical problems such as poor reproducibility, the project was once interrupted, making the domestic diamond manufacturing industry always in a large output and low grade. situation.
In January 2006, Huanghe Company gathered the top talents in the domestic industry, and concentrated on the research of large single crystal diamond synthesis technology in four stages. It has independently developed temperature and pressure precision measurement and control, nitrogen removal, rapid crystal growth, and multi-particle large single crystal. Five key core technologies, such as growth, successfully synthesized large single crystal diamonds with a diameter of 6 mm and drastically reduced the synthesis cost. According to reports, by the end of this year, the company's large single crystal synthesis capacity is expected to reach 10mm.
Changge: Synthesize the largest single crystal synthetic diamond in China
Henan Daily reported: (Reporter Zhang Huajun correspondent Liu Wei) Henan Huanghe Cyclone Company in Changge City has successfully mastered the synthetic technology of gem-quality large single crystal synthetic diamond.