Sol-gel Processing Of Cordierite: Effect of Seeding and Optimization of Heat Treatment

Ann M. Kazakos, Sridhar Komarneni, Rustum Roy

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48 Scopus citations

Abstract

Three series of cordierite powders were prepared by the sol-gel route: a single phase (monophasic) gel prepared from alkoxides, a nominally triphasic nanocomposite gel made with two nanosized powders and one solution phase, and a truly compositionally triphasic nanocomposite gel prepared from three nanosized powders. Crystalline α-cordierite seeds were also incorporated with the gels and their effectiveness as nucleating agents was investigated and found to lower the crystallization temperature of α-cordierite by 125–150 °C. The densification behavior of powder compacts was examined and alterations made to the heat treatment until optimum conditions were found. The truly triphasic compact sintered at 1300 °C for 2 h resulted in 100% of theoretical density whereas the nominally triphasic and monophasic pellets densified to 96% and 80%, respectively. The enhanced densification achieved with powder compacts prepared from triphasic nanocomposite gels is due in part to the excess free energy of the three components.

Original languageEnglish (US)
Pages (from-to)1095-1103
Number of pages9
JournalJournal of Materials Research
Volume5
Issue number5
DOIs
StatePublished - May 1990

All Science Journal Classification (ASJC) codes

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

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