Flash spark plasma sintering of HfB2 ceramics without pre-sintering

Research output: Contribution to journalArticle

Authors

  • Salvatore Grasso
  • Lei-Feng Liu
  • Hai-Bin Ma
  • Michael Reece

External organisations

  • Queen Mary University of London
  • Chinese Nuclear Power Technology Research Institute

Abstract

Strong HfB2 powder green bodies with compressive strengths exceeding 20 MPa have been produced by incorporating 1 wt% of glassy carbon derived from a pyrolyzed phenolic resin binder. Starting from the green body after debinding in argon, non-textured HfB2 ceramics (diameter ~ 20 mm and height ~ 4 mm) with a relative density of 95.1% were achieved using flash spark plasma sintering (FSPS) with a discharge time of 20 s, peak power of 19 kW and applied pressure of ~16 MPa. The lack of a need for a pre-sintering step resulted in energy savings compared to the densification of HfB2 ceramics by FSPS.

Details

Original languageEnglish
Pages (from-to)115-119
JournalScripta Materialia
Volume156
Early online date25 Jul 2018
Publication statusPublished - 1 Nov 2018

Keywords

  • borides, flash spark plasma sintering, sintering, microstructure