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Dr. Yuan talks about diamonds: the direction of improvement in CVD reactors.

Chemical weather deposition CVD growth to cultivate diamonds, the equipment used must have three advantages: 1, fast growth, growth rate of more than 10 microns/hour. 2. The color is positive white: the slow length is directly long white or the fast length is changed to positive white without auxiliary colors such as coffee, gray and black. 3. Large tray growth, diameter 3, 4, 6 inch tray.

16

2022

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02

Dr. Yuan talks about diamonds: nurturing the growth and market of diamonds in the future

To cultivate the application of diamond in industry, it is necessary to develop as much as possible and supply a large number of industrial uses, especially large-area flaky single crystal diamond. The application in semiconductor industry and electronics industry will have great use in the future, but the quality should be reduced to 1/10 of the current price.

09

2022

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02

Dr. Yuan talks about diamonds: heat treatment of red sapphire diamonds

Cultivated diamonds are artificially grown, and a simple heat treatment is added, so that the obtained positive white is a long-term stable synthetic diamond, which is still sold in the name of laboratory-grown diamonds, which is reasonable and justifiable. Whether the cultivated diamond has undergone post-heat treatment, especially slight heat treatment, cannot or is not easy to identify. The grading report cannot clearly determine whether it has undergone heat treatment. In recent years, the unclear marks in the remarks column on the certificate regarding post-heat treatment, such as "may include post-growth treatment" and "no sign of post-growth treatment" are unnecessary.

02

2022

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02

Dr. Yuan talks about diamonds: nurturing the sales situation of diamond rough and how to respond

The annual output of diamond rough cultivation is now about 15 million carats, with a total price of about US $1.5 billion. If there are three inspection meetings, each inspection meeting will sell about 5 million carats, worth about US $0.5 billion. After the future expansion of the industry, the number and scale of the goods will gradually expand.

26

2022

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01

Dr. Yuan talks about diamonds: Namibia Grinding Diamonds

At the end of 2007, a diamond wholesale company in new york, USA, applied for membership in De Beers's goods-watching club in Namibia and invited us to send a diamond-cutting team to teach diamond grinding there. Namibia is located in the southwest corner of Africa, formerly known as Southwest Africa. It is a relatively special diamond producing country. There are no diamond mines ejected from volcanoes in its territory, mainly diamond mines ejected from multiple volcanoes in South Africa in the southeast. From the surface washed by rivers to Namibia in the northwest of South Africa along the Atlantic coast, the rivers have been diverted countless times for billions of years, and diamonds remain along the way, finally, most of them are deposited on the 1600-kilometer-long beach and near-shore seabed, so it is relatively easy to mine diamond mines. As long as the sea sand on the beach and near-shore seabed is scraped and washed, high-quality natural diamond blanks can be obtained. After the author took a plane picture of the diamonds dug on the beach, the remains of potholes and the seabed in the coastal sea also deposited quite a lot of diamond blanks.

19

2022

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Dr. Yuan talks about diamonds: types and analysis of CVD reactors

Japan's Seki company in 1999 using the United States ASTeX company's patented technology successfully developed a microwave plasma chemical vapor deposition diamond system, and sold more than 500 sets of equipment to the world for experimental and commercial production. It was acquired by Cornes in 2014, and the flip-top SDS6K MPCVD equipment produced follows Seki's technology.

12

2022

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01

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