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Title: Diamond-cBN alloy: A universal cutting material

Diamond and cubic boron nitride (cBN) as conventional superhard materials have found widespread industrial applications, but both have inherent limitations. Diamond is not suitable for high-speed cutting of ferrous materials due to its poor chemical inertness, while cBN is only about half as hard as diamond. Because of their affinity in structural lattices and covalent bonding character, diamond and cBN could form alloys that can potentially fill the performance gap. However, the idea has never been demonstrated because samples obtained in the previous studies were too small to be tested for their practical performance. Here, we report the synthesis and characterization of transparent bulk diamond-cBN alloy compacts whose diameters (3 mm) are sufficiently large for them to be processed into cutting tools. The testing results show that the diamond-cBN alloy has superior chemical inertness over polycrystalline diamond and higher hardness than single crystal cBN. High-speed cutting tests on hardened steel and granite suggest that diamond-cBN alloy is indeed a universal cutting material.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ;  [1] ; ;  [3] ; ;  [4]
  1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China)
  2. (United States)
  3. High Pressure Science and Engineering Center and Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154 (United States)
  4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
Publication Date:
OSTI Identifier:
22482029
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AFFINITY; BONDING; BORON NITRIDES; COMPACTS; COVALENCE; CUTTING; CUTTING TOOLS; DIAMONDS; GRANITES; HARDNESS; MATERIALS; MONOCRYSTALS; PERFORMANCE; POLYCRYSTALS; POTENTIALS; STEELS; SYNTHESIS; TESTING; VELOCITY