The effect of Si on the microstructure and mechanical properties of spark plasma sintered boron carbide

Luoning Ma, Kelvin Y. Xie, Muhammet F. Toksoy, Kanak Kuwelkar, Richard Haber, Kevin J. Hemker

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Fully dense boron carbide discs were achieved by spark plasma sintering boron carbide powders with 10 wt% silicon. The silicon did not diffuse into boron carbide grains to produce a solid solution of Si-doped boron carbide; instead the silicon reacted with impurities in the starting powder to form β-SiC and borosilicate glass. The resultant new phases facilitated densification of the multiphase ceramic through liquid phase-assisted sintering. The resultant material exhibits improved hardness (34.3 GPa Vikers hardness under 1 kg load) with toughness comparable to both Si-free and commercially available boron carbide.

Original languageEnglish (US)
Pages (from-to)274-278
Number of pages5
JournalMaterials Characterization
Volume134
DOIs
StatePublished - Dec 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Boron carbide
  • Silicon additive
  • Spark plasma sintering

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