Summary According to a US magazine reported that the diamond is no longer the world's hardest material, January 2013 issue of "Nature" magazine wrote a newly released material has gone beyond the hardness of diamonds. A study from scientists from universities such as the University of Chicago
According to a US magazine, diamonds are no longer the hardest material in the world. The January 2013 issue of Nature magazine published a new material that has surpassed the hardness of diamonds. A research team from scientists at the University of Chicago and Other universities pointed out that the superhard material cubic boron nitride is a form of ultra-hard material that compresses boron nitride particles. Scientists have shown that this transparent material even exceeds the hardness of diamonds, with a Vickers hardness of 108 GPa, while synthetic diamonds have a Vickers hardness of 100 GPa and that this material is twice the hardness of commercial cubic boron nitride.
The biggest secret of this material is the nanostructure. Researchers began to use boron nitride particles with an onion structure to compress to 15GPa at 1800 degrees Celsius, which is about 68,000 times the pressure of the car tire. The crystal material will recombine to form nanometers. structure.
Under the nanocrystal structure, adjacent atoms share a boundary, which is like some apartment houses. To make this material harder, scientists have reduced the size of these particles, making them harder and unable to be pierced. According to Tian Yongjun, this nanostructure can make the material harder and difficult to be pierced. For boron nitride, the average size of the characteristic strength is 4 nm, but the corresponding result is that the cubic boron nitride is in a high temperature environment. It is very stable.
In the future, this superhard material will be priced at the same price as the current commercial low-hardness cubic boron nitride, and may be used in the future for machining, milling, drilling, cutting tools, and for the manufacture of scientific instruments.
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