Study on in-situ reaction synthesis and mechanical properties of Si 2N2O ceramic

Xiangming Li, Litong Zhang, Xiaowei Yin

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Si2N2O ceramics were fabricated using an in-situ reaction synthesis method by nitriding powder mixture of Si and SiO2. The reaction mechanism in the SiSiO2N2 system was discussed by analyzing the variation of Gibbs free energy with temperature. As the sintering temperature rises from 1450 to 1700 °C, the Si 2N2O phase increases with the Si3N4 phase decreasing and there is only Si2N2O with hardly any Si3N4 after sintering at 1700 °C, the volume shrinkage and mean pore size decrease respectively from 26.1% to 18.0% and from 0.4 to 0.04 μm, the porosity increases from 20.8% to 29.1%, and the Vickers hardness decreases from 5.6 to 4.5 GPa. After sintering at 1600 °C, Si 2N2O ceramic possesses the highest flexural strength of 229 MPa and fracture toughness of 2.3 MPa m1/2.

Original languageEnglish
Pages (from-to)3035-3041
Number of pages7
JournalCeramics International
Volume39
Issue number3
DOIs
StatePublished - Apr 2013

Keywords

  • Mechanical properties
  • Microstructure
  • Silicides
  • Structural applications

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