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 language | English (US) |
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Pages (from-to) | 1095-1103 |
Number of pages | 9 |
Journal | Journal of Materials Research |
Volume | 5 |
Issue number | 5 |
DOIs | |
State | Published - May 1990 |
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering