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Title: Submicron cubic boron nitride as hard as diamond

Here, we report the sintering of aggregated submicron cubic boron nitride (sm-cBN) at a pressure of 8 GPa. The sintered cBN compacts exhibit hardness values comparable to that of single crystal diamond, fracture toughness about 5-fold that of cBN single crystal, in combination with a high oxidization temperature. Thus, another way has been demonstrated to improve the mechanical properties of cBN besides reducing the grain size to nano scale. In contrast to other ultrahard compacts with similar hardness, the sm-cBN aggregates are better placed for potential industrial application, as their relative low pressure manufacturing perhaps be easier and cheaper.
Authors:
; ; ; ; ; ; ; ; ;  [1] ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China)
  2. (HPSTAR), Shanghai 201203 (China)
  3. Institute of Fluid Physics and National Key Laboratory of Shockwave and Detonation Physic, China Academy of Engineering Physics, Mianyang 621900 (China)
  4. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong (China)
  5. (China)
Publication Date:
OSTI Identifier:
22398767
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BORON NITRIDES; COMPARATIVE EVALUATIONS; CUBIC LATTICES; DIAMONDS; FRACTURE PROPERTIES; GRAIN SIZE; HARDNESS; MONOCRYSTALS; POTENTIALS; PRESSURE DEPENDENCE; SINTERING; TEMPERATURE DEPENDENCE