Editor's note:
This article is a letter sent by Liu Wenming to Professor Wang Guangzu. The letter is a new type of pressure-transfer sealing medium developed by the researcher Liu Wenming that can replace natural pyrophyllite as synthetic diamond. In this paper, the performance of the new pressure-transfer sealing medium is introduced in detail. After many synthetic tests (synthesized test blocks with powder process are sent with the letter), the feasibility is proved.
At present, China's synthetic diamonds have an annual output of more than 7 billion carats. It is the world's largest diamond country and has entered the ranks of powerful countries. It is conceivable for the use of pressure-transfer sealing media for diamond synthesis, and the natural pyrophyllite is gradually depleted. Therefore, the development of alternative materials is of great significance. Hereby for your reference!
China's production of synthetic diamond in the past 50 years relies on pyrophyllite as a pressure transmission medium. Although it is continuously improved in use, it is cut into squares from natural ore → powder forming → the composite block used until now, but it is always inseparable from pyrophyllite. Matrix material.
The use of pyrophyllite as a pressure transmitting medium has been for half a century. The pyrophyllite source in Mentougou, Beijing is also facing depletion. According to the overall plan of Beijing construction, Mentougou has been planned as an ecological park construction project. Soon all mining enterprises will have to The forced closure caused the already scarce pyrophyllite source to go ahead. The industry has repeatedly sought other mineral sources to replace pyrophyllite as the basic material, but it still can not achieve the desired results, making the diamond industry face the predicament of no rice...
At this critical moment, I worked hand-in-hand with Shaoyang Hongtai Diamond Tools Factory (hereinafter referred to as Hongtai) Liu Heping. According to the requirements of pressure-transfer media for synthetic diamond production, several ores were screened and powdered and formed by the method of mixing and mixing. It conducts test research on pressure transmission, sealing and heat preservation. Through repeated optimization and optimization, and continuous exploration in the production process and synthesis process, the diamond has been successfully synthesized with the newly developed pressure transmitting medium. ! After repeated trials, the ore we have finally blended can achieve the same effect as the original door-head ditch stone as a pressure transmitting medium for diamond production! I would like to thank Liu Yuhui, General Manager of Hunan Jinhui Superhard Materials Co., Ltd., and Master Hong Zhong for their strong support in the synthesis test.
At present, we are expanding the scope of the test further. According to the previous stage of the test, we believe that the pressure-transmitting medium of this mixed powder type has very good sealing performance (from the synthesis experiment, it shows no abnormal reaction with the synthesis of pyrophyllite), and the pressure is transmitted. The performance and thermal insulation performance are also superior to the traditional pressure transmitting medium. In the repeated test, not only the gun is not discharged, but also the cooling time for stopping the heating is basically the same as the use of pyrophyllite. And the results obtained from the use of this material prove that this mixed pressure transfer medium can completely replace the pyrophyllite produced in Mentougou, and its performance is fully acceptable in the industry. At present, “Hongtai†has entered the mass production of this new hybrid pressure transmission medium, and new products will be gradually put on the market, and it is planned to expand the production type test. It is expected that the demand of users will be gradually satisfied in early 2011, and this innovation has been achieved. Solve the urgent need to produce synthetic diamond base materials. We believe that this new type of pressure transmitting medium will be more stable and reliable in use! At the same time, we firmly believe that the use of this new material can promote the production of synthetic diamonds into a new stage!
Here, I will inform the colleagues of the following in a simple written situation. Please rest assured that even if the pyrophyllite mine in Mentougou, Beijing is closed immediately, our synthetic diamond production can continue to develop!
Optical Microscopy
In optical microscopy different filters are used to improve contrast and emphasize specific features based on material properties. This can be achieved with magnifications typically ranging from 2.5 times up to 1,000 times. In materialography, reflected light is the most commonly used type of light optical microscopy. Transmitted optical microscopy is also used, but mainly for mineralogy specimens.
Stereo Optical Microscopy
The stereo microscope is an optical microscope variant, designed for low magnification observation of a specimen, using the light reflected from the specimen surface.
Scanning Electron Microscopy
A scanning electron microscope (SEM) is a type of electron microscope that produces images of a specimen by scanning the specimen surface with a focused beam of electrons. The electrons interact with the atoms in the specimen, producing various signals that can be translated into information about the surface topography and the composition of the specimen.
Transmission Electron Microscopy
Transmission electron microscopy (TEM) uses a beam of electrons transmitted through an ultra-thin specimen and that interacts with the specimen as it passes through it. Generated signals can be translated into various types of information, including information on the type and orientation of individual crystals.
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