Japan has developed a world-class precedent for ultra-high hardness and high temperature resistant polycrystalline diamonds
When you mention a diamond, everyone knows it is expensive and hard. However, do you know that diamonds are the same, but the hardness is different? Originally, due to the difference in structure and purity, the hardness of diamonds is very different. Recently, Japanese researchers have developed an ultra-high hardness polycrystalline diamond.
Usually, as a jewelry, people are cherished by natural single crystal diamonds, and their hardness is superior to other substances. But compared to industrial polycrystalline diamonds, its hardness is dwarfed. However, pure polycrystalline diamonds have so far had no precedent for synthesis in the world. What is actually used in the industry is a stacked diamond in which a plurality of single crystal diamonds are bonded by metal, and the hardness is only 50 to 70 giga Pascals, and it is difficult to use when the temperature reaches 700 degrees Celsius or more.
Researchers at the Deep Earth Dynamics Research Center at Ehime University in Japan have used graphite to convert graphite into pure polycrystalline diamonds for the first time using a “direct conversion method†without catalysts. The specific method is not to directly heat the graphite, but to heat the graphite in other heaters. This way, after a few minutes or even tens of minutes, diamonds can be synthesized in an ultra-high pressure environment. The applied pressure is 2 to 10 times that of the usual synthetic diamond, from 120,000 to 250,000 atmospheres, and the temperature is 1800 to 2500 degrees Celsius. The diamond thus synthesized is a polycrystal that combines tens of nanometers in diameter and has a truly unmatched hardness of 140 gigapascals, which is twice the hardness of industrial diamonds and is resistant to high temperatures.
Due to equipment limitations, the university is currently only able to synthesize products of 2 to 3 mm in size. By March of this year, the university will build the world's largest multi-edge ultra-high pressure generating device, when there will be a larger polycrystalline diamond.
When you mention a diamond, everyone knows it is expensive and hard. However, do you know that diamonds are the same, but the hardness is different? Originally, due to the difference in structure and purity, the hardness of diamonds is very different. Recently, Japanese researchers have developed an ultra-high hardness polycrystalline diamond.
Usually, as a jewelry, people are cherished by natural single crystal diamonds, and their hardness is superior to other substances. But compared to industrial polycrystalline diamonds, its hardness is dwarfed. However, pure polycrystalline diamonds have so far had no precedent for synthesis in the world. What is actually used in the industry is a stacked diamond in which a plurality of single crystal diamonds are bonded by metal, and the hardness is only 50 to 70 giga Pascals, and it is difficult to use when the temperature reaches 700 degrees Celsius or more.
Researchers at the Deep Earth Dynamics Research Center at Ehime University in Japan have used graphite to convert graphite into pure polycrystalline diamonds for the first time using a “direct conversion method†without catalysts. The specific method is not to directly heat the graphite, but to heat the graphite in other heaters. This way, after a few minutes or even tens of minutes, diamonds can be synthesized in an ultra-high pressure environment. The applied pressure is 2 to 10 times that of the usual synthetic diamond, from 120,000 to 250,000 atmospheres, and the temperature is 1800 to 2500 degrees Celsius. The diamond thus synthesized is a polycrystal that combines tens of nanometers in diameter and has a truly unmatched hardness of 140 gigapascals, which is twice the hardness of industrial diamonds and is resistant to high temperatures.
Due to equipment limitations, the university is currently only able to synthesize products of 2 to 3 mm in size. By March of this year, the university will build the world's largest multi-edge ultra-high pressure generating device, when there will be a larger polycrystalline diamond.
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