Beilstein J. Nanotechnol.2012,3, 586–588, doi:10.3762/bjnano.3.68
known to exhibit poor thermo-chemo-mechanical stability particularly against low carbon ferrous alloys [4] and at elevated temperatures [5]. It is surprising, but true, that diamond, the hardest material available (until the commercial realization of beta carbonnitride β-(C3N4) [6]), wears out rapidly
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Figure 1:
Composition cycle of ultra-hard materials (C–N–B–Si) [11].