Microstructural characterization of spark plasma sintered boron carbide ceramics

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106 Scopus citations

Abstract

Fully dense boron carbide specimens were fabricated by the spark plasma sintering (SPS) technology in the absence of any sintering additives. Densification starts at 1500 °C and the highest densification rate is reached at about 1900 °C. The microstructure of the ceramic sintered at 2200 °C, with heating rates in the 50-400 °C/min range, displays abnormal grain growth, while for a 600 °C/min heating rate a homogeneous distribution of finely equiaxed grains with 4.05 ± 1.62 μm average size was obtained. TEM analysis revealed the presence of W-based amorphous and of crystalline boron-rich B50N2 secondary phases at triple-junctions. No grain-boundary films were detected by HRTEM. The formation of a transient liquid alumino-silicate phase stands apparently behind the early stage of densification.

Original languageEnglish
Pages (from-to)451-457
Number of pages7
JournalCeramics International
Volume36
Issue number2
DOIs
StatePublished - 1 Mar 2010

Keywords

  • Boron carbide
  • HRTEM
  • Microstructure
  • Sintering behaviour
  • Spark plasma sintering (SPS)
  • TEM

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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