Superhard tools play an increasingly important role in the modern processing industry. At the same time, improving the hardness, toughness and stability of superhard tool materials has always been the common pursuit of the scientific community and industry. The Chinese and foreign scientists headed by Professor Tian Yongjun, the State Key Laboratory of Metastable Materials Preparation Technology and Science at Yanshan University, first established a theoretical model for the hardening of polycrystalline covalent materials. It was found that the hardness at the nanometer scale should be derived from the Hall-Page effect and quantum limit. The co-contribution of the domain effects; they subsequently synthesized nano twinned cubic boron nitride by martensitic transformation of onion BN with a similar Russian doll crystal structure at high temperature and pressure. The hardness of the material exceeds the artificial diamond single crystal, and the toughness is superior to that of the commercial hard alloy, and the oxidation resistance temperature is higher than that of the cubic boron nitride single crystal itself. At the same time, they also found that nano-twisted cubic boron nitride can continue to harden to 3.8 nm with the thickness of the twin crystal, breaking through the well-known lower limit of material hardening (about 10 nm). The basic principles and synthetic techniques of this research are equally applicable to the synthesis of nano twinned diamonds and their composite materials. From then on, a series of tool materials with better comprehensive performance will be born, and will be in the industries of machining, geological exploration, oil and gas mining, etc. Play an important role.
The above research results were published in the January 2013 issue of Nature. The cover and catalogue pages of Nature have been introduced to the paper. The title of the book "hard age: now cubic boron nitride is comparable to diamond in its extremely hard state" is vividly introduced, and the original image of the synthetic sample is dispensed. Many famous international societies, media and magazines have also reported on this.
The “Top Ten Science and Technology Progress of Chinese Higher Education†has been selected since its inception in 1998 and has been held for 16 sessions. The other nine results this year came from Peking University, Beijing Jiaotong University, National Defense Science and Technology University, Harbin Institute of Technology, Tsinghua University, Xiamen University and Zhejiang University.
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