Crack healing and strength recovery in SiC/spinel nanocomposite

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Abstract

The crack healing behavior and the strength recovery of the newly introduced SiC/spinel nanocomposite were investigated. SiC/spinel nanocomposite containing 27.26 wt% SiC was prepared by the ball milling of talc, graphite and aluminum powders with subsequent annealing at 1200 °C for 1 h in a vacuum. The SEM results showed that the surface cracks produced by Vickers indenter on the prepared SiC/spinel pellets can be completely healed after sintering at 1545 °C for 1 min in air atmosphere. Furthermore, an almost complete strength recovery of the specimens can be obtained in those samples heat treated at 1550 °C for 1 min, as evaluated by diametral tensile strength (DTS) test. The formations of mullite and aluminosilicate glassy phases are the major factors which are responsible for the crack healing and strength recovery in the structure. It was found that the healing efficiency of those specimens healed at 1550 °C for 1 min is 99%.

Original languageEnglish (US)
Pages (from-to)8702-8709
Number of pages8
JournalCeramics International
Volume41
Issue number7
DOIs
StatePublished - Aug 1 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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