Oxidation behaviour and high temperature strength of alumina-silicon carbide nanocomposites

T. Kennedy, J. Brown, J. Doyle, S. Hampshire

Research output: Contribution to journalArticlepeer-review

Abstract

The processing of Al2O3-SiC nanocomposites has been examined in detail. It has been found that processing in water as opposed to organic solvents leads to a more reproducible nanocomposite. High strengths at room temperature have been obtained with the addition of only 5 vol% nanometric SiC in nanometric α-Al2O3, densified by hot pressing. In the current study, the high temperature strength of alumina-silicon carbide nanocomposite materials prepared in this way has been measured at 1150, 1250 and 1350°C. Oxidation in air and corrosion experiments in a flue gas composed of 80.8% N2, 15% CO2, 4% O2 and 0.2% S2, were also conducted at these temperatures. Al2O3-5 vol% SiC nanocomposite maintained strengths of greater than 550MPa at temperatures up to 1250°C. The gain in mass per unit area during oxidation in air was very low, even after 96 hours at 1350°C.

Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalKey Engineering Materials
Volume113
Publication statusPublished - 1996

Keywords

  • High Temperature Strength
  • Nanocomposites
  • Oxidation
  • Silicon Carbide-Alumina

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