Preparation of Boron Suboxide Nanoparticles and Their Processing

Crystalline boron suboxide B₆O particles with size in the range of 1.5 µm–2 µm and crystallite size in the range of 32 nm–40 nm were prepared by calcination at 1400°C for one or two hours of precursors obtained by mixing X-ray amorphous boron with water solution of B₂O₃followed by evaporation and drying. Decrease of molar ratio B/B₂O₃ from 16 to 14 in the precursor mixture reduced nonstoichiometry of prepared B₆O although simultaneously it increased admixture of B₂O₃. Particulate composites of B₆O with TiN or Ni nanoparticles were prepared by mechanical mixing. The spark plasma sintering process intensified the densification of prepared boron suboxide nanoparticles at 1900°C and allowed manufacturing of fully dense bodies (98 %) during five minutes. Additives of TiN or Ni nanoparticles reduced sintering temperature to 1700°C and their promoted formation of Ti or Ni borides.<p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.18.1.1345">http://dx.doi.org/10.5755/j01.ms.18.1.1345</a></p>

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