"The hardness of artificial synthetic materials exceeds that of diamond. This is the result of scientific and technological workers doing material research all over the world. It is an honor that we have developed it." The microstructure design and synthesis project of nano twin superhard materials is mainly completed Dr. Yu, one of the people, said in an interview with Hay Think that HBYS Superhard Materials Technology Group has successfully developed the world's hardest material-nano twin superhard materials, and China has completely independent intellectual property rights to it. .
On April 13, the 2020 HB Provincial Science and Technology Award Conference was held. The microstructure design and synthesis project of nano twin superhard materials won the first prize of the Provincial Natural Science Award. In this regard, Dr. Yu said that the successful development of nano-twinned superhard materials is the result of the collective research of the entire research team, and the award of nano-twinned superhard materials is a collective honor of the research team.
It is understood that the nano-twinned superhard material is a new and super high-performance material. Its most prominent feature is that its hardness exceeds twice that of natural diamond. Its successful development has caused a sensation all over the world.
Dr. Yu created the hardness model of polycrystalline covalent materials, realized the quantitative prediction of the hardness of polycrystalline covalent materials, and clarified the physical mechanism of the continuous hardening of nano-polycrystalline covalent materials. Using onion boron nitride as raw material, the ultra-hard nano-twinned bulk material with nano-twin structure (nt-cBN) was synthesized using high-temperature and high-pressure technology. The average twin thickness is 3.8 nanometers, and the Vickers hardness and fracture toughness are respectively. It reaches 108GPa and 12.7MPa·m1/2, which is 2 times and 4.5 times that of cBN single crystal; its anti-oxidation temperature reaches 1294℃. 3. The synthesis of nano-twin structure of extremely hard diamond (nt-diamond) and its twin refinement mechanism: using onion carbon as the raw material, the nano-twin structure of extremely hard diamond (nt-diamond) bulk material is synthesized under high temperature and high pressure The average twin thickness is 5nm, and the Vickers hardness is 200GPa, which is twice that of natural diamond single crystal. It realizes the dream of artificial synthetic material being harder than natural diamond; the fracture toughness of nt-diamond is 9.7~14.8MPa·m1/2, The oxidation resistance temperature is 980℃, which is 210℃ higher than natural diamond.