Hardness and toughness control of brittle boron suboxide ceramics by consolidation of star-shaped particles by spark plasma sintering

Ievgen Solodkyi, Dmytro Demirskyi, Yoshio Sakka, Oleg Vasylkiv

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The hardness and fracture toughness of boron suboxide ceramics synthesized under ambient pressure and consolidated by spark plasma sintering (SPS) are reported. The structure and characterization of ceramics with a hardness of up to 43 GPa under a 9.8 N load and almost 28 GPa under a load of 198 N are reported. It was shown that an increase in the stoichiometry of boron suboxide by promoting the occupancy of the 6c position in the rhombohedral cell is the effective for achieving both hard and tough pure B6O ceramics. SPS consolidation preserved the unique fivefold symmetry of the boron suboxide grains and thus promoted additional toughening due to numerous crack deflections on fine 100 nm subgrains.

Original languageEnglish
Pages (from-to)3525-3530
Number of pages6
JournalCeramics International
Volume42
Issue number2
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • Boron suboxide
  • C. Hardness
  • Indentation fracture toughness
  • Spark plasma sintering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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