Synthesis, characterization and formation mechanism of SiC/spinel nanocomposite

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Abstract

This paper reports the successful synthesis of SiC/spinel (MgAl 2O4) nanocomposite from talc, aluminum and graphite powders. The initial powders were mixed to obtain stoichiometric spinel containing 27.26 wt.% SiC. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM) techniques were utilized to characterize the synthesized powders. SiC/spinel nanocomposite was obtained after 6 h ball milling of initial materials in argon atmosphere with subsequent annealing at 1200 C for 1 h in vacuum. The obtained nanocomposite had crystallites size between 1 and 15 nm with the mean diameter of 9 nm. The SiC/spinel composite formation mechanism was scrutinized. The results showed that SiC/spinel nanocomposite was not produced directly and the formation of some intermediate compounds is unavoidable during the synthesis procedure. The SiC/spinel nanocomposite powder may be a potential nanocomposite for high temperature applications with self-crack-healing capability.

Original languageEnglish (US)
Pages (from-to)106-112
Number of pages7
JournalJournal of Alloys and Compounds
Volume598
DOIs
StatePublished - Jun 15 2014

All Science Journal Classification (ASJC) codes

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

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