Hot-spots generation, exaggerated grain growth and mechanical performance of silicon carbide bulks consolidated by flash spark plasma sintering

Dmytro Demirskyi, Oleg Vasylkiv

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Flash Spark Plasma Sintering (FSPS) that combines flash sintering and electric field assisted sintering was used to densify SiC ceramics. FSPS was compared with ‘conventional’ SPS which used a moderate 100 °C·min−1heating rates. Dense SiC specimens were obtained despite being at temperature of 1850–2050 °C for few seconds. FSPS lead to generation of hot-spots and thus caused localized exaggerated grain-growth. This allows producing silicon carbide ceramics with bimodal grain size distribution. Analysis of microstructure and strength of silicon carbide ceramics consolidated using flash heating allowed proposing several optimization routes of the FSPS process.

Original languageEnglish
Pages (from-to)466-473
Number of pages8
JournalJournal of Alloys and Compounds
Volume691
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Carbon diffusion
  • Flash sintering
  • Silicon carbide
  • Spark plasma sintering
  • Strength

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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