The effect of the initial α-Al2O3 particle size in the reaction-bonded aluminum oxide (RBAO) process on the phase transformation of aluminum-derived γ-Al2O3 to α-Al2O3, and subsequently densification, was investigated. It has been demonstrated that if the initial α-Al2O3 particles are fine (∼0.2 μm, i.e., 2.9 x 1014 γ-Al2O3 particles/cm3), then they seed the phase transformation. The fine α-Al2O3 decreases the transformation temperature to ∼962°C and results in a finer microstructure. The smaller particle size of the seeded RBAO decreases the sintering temperature to as low as ∼1135°C. The results confirm that seeding can be utilized to improve phase transformations and densification and subsequently to tailor final microstructures in RBAO-derived ceramics.
|Original language||English (US)|
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|State||Published - Mar 2001|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry