Low-temperature synthesis and mechanical properties of SiC porous granules from activated charcoal with a Na flux

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Abstract

SiC porous granules were synthesized from activated granular charcoal and Si powder at 973 K by using a Na flux. The SiC granules maintained the shape of the charcoal with a dimension of about 5 mm in diameter and 7-10 mm in length. X-ray diffraction showed the structure of the formed SiC to be cubic β-type. Agglomerates of a few dozen nm of SiC grains and an electron diffraction ring pattern of β-SiC were observed with a transmission electron microscope. A micropore size distribution of < 4 nm and mesopores in the range of 20-40 nm were shown by a nitrogen adsorption technique. The SiC granules had a specific surface area of 3.4 ± 1.0 m2/g and a pore volume of 0.006 ± 0.002 cm3/g. The fracture stress of the SiC porous granules was evaluated to be 47 MPa by a compressive test at room temperature. The Vickers hardness of the granule surface was 13.1 ± 1.0GPa.

Original languageEnglish
Pages (from-to)1929-1933
Number of pages5
JournalMaterials Transactions
Volume49
Issue number9
DOIs
Publication statusPublished - 2008 Sep 1

Keywords

  • Activated charcoal
  • Compressive strength
  • Low temperature synthesis
  • Silicon carbide
  • Sodium flux
  • Vickers hardness

ASJC Scopus subject areas

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

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