Mechanical properties of nano-grain SiO2 glass prepared by spark plasma sintering

Zhenhua He, Hirokazu Katsui, Takashi Goto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Silicon carbide (SiC) layers were deposited on silica (SiO2) glass powder by rotary chemical vapor deposition (RCVD) to form SiO2 glass (core)/SiC (shell) powder; this powder was consolidated by spark plasma sintering (SPS). SiO2 glass powder with a particle size of 250 nm was coated with 5–10-nm-thick SiC layers. The resultant SiO2 glass (core)/SiC (shell) powder was consolidated to form a nano-grain SiO2 glass composite at a relative density above 90% by SPS in the sintering temperature range of 1573–1823 K. The Vickers hardness and fracture toughness of the SiO2 glass composite at 1723 K were found to be 14.2 GPa and 5.4 MPa m1/2, respectively.

Original languageEnglish
Pages (from-to)721-725
Number of pages5
JournalJournal of the European Ceramic Society
Volume37
Issue number2
DOIs
Publication statusPublished - 2017 Feb 1

Keywords

  • High fracture toughness
  • High hardness
  • Rotary chemical vapor deposition
  • SiC-coated SiO glass powder
  • Spark plasma sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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