A novel route to superhard nanocrystalline cubic boron nitride: Emulsion detonation and high-pressure high-temperature transformation-assisted consolidation

Igor Petrusha, Chawon Hwang, Tatiana Prikhna, Metin Örnek, Dexin Zhao, Kelvin Y. Xie, Richard A. Haber, Myroslav Karpets, Semyon Ponomaryov, Sergey Dub, Viktoer Moshchil

Research output: Contribution to journalArticlepeer-review

Abstract

Synthesizing bulk nanocrystalline materials is challenging since grain growth should be suppressed whereas densification promoted. Here, we demonstrate a novel route to synthesize superhard bulk nanocrystalline cubic boron nitride (cBN), which combines the use of emulsion detonation and high-pressure high-temperature transformation-assisted consolidation. The emulsion detonation process activates BN to possess unique structure and chemistry, i.e. wurtzitic BN nanograins in hexagonal BN matrix with enhanced structural disordering and oxygen impurity, a combination that enhances the nucleation rate of cBN and its densification leading to the formation of bulk nanocrystalline cBN at reduced conditions. The cBN, synthesized at 7.5 GPa and 1800 °C, displayed Vickers hardness values of 50−62 GPa for 5−20 N loads. The findings in the study suggest a feasible solution to synthesize bulk nanocrystalline cBN in a more scalable way, while also providing design insights on how to refine grain growth while enhancing densification to synthesize bulk nanocrystalline materials.

Original languageEnglish (US)
Pages (from-to)5505-5511
Number of pages7
JournalJournal of the European Ceramic Society
Volume41
Issue number11
DOIs
StatePublished - Sep 2021

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Keywords

  • Cubic boron nitride
  • Emulsion detonation
  • Nanocrystalline
  • Superhard
  • Transformation-assisted consolidation

Fingerprint

Dive into the research topics of 'A novel route to superhard nanocrystalline cubic boron nitride: Emulsion detonation and high-pressure high-temperature transformation-assisted consolidation'. Together they form a unique fingerprint.

Cite this