In situ development of La-β-Al2O3 (LBA) platelets in α-Al2O3 was studied as a function of the preparation method: a conventional solid-state reaction of commercial A12O3 powder and La(NO3)3 as well as a sol-gel method starting with boehmite and the same La2O3 precursor. In both cases, homogeneous distribution of the reinforcing phase was achieved, and a noteworthy inhibition of A12O3 grain growth resulted. However, samples prepared by solid-state reaction densified more easily than those prepared via sol-gel, but the formation of the LBA phase occurred at a lower temperature in samples prepared by the sol-gel approach. Results on the correlation of the onset of LBA grain growth and densification to microstructure are discussed.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of the American Ceramic Society|
|State||Published - Jan 1 1999|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry