Metastability in the MgAl₂O₄-Al₂O₃ system
Aluminum oxide must take a spinel form (γ-Al2O3) at elevated temperatures in order for extensive solid solution to form between MgAl2O4 and α-Al2O3. The solvus line between MgAl2O4 and Al2O3 has been defined at 79.6 wt% AI2O3 at 1500°C, 83.0 wt% Al2O3 at 1600Â°C, and 86.5 wt% Al2O3 at 1700°C. A metastable region has been defined at temperatures up to 1700°C which could have significant implications for material processing and properties. Additionally, initial processing could have major implications on final chemistry.
K. R. Wilkerson et al., "Metastability in the MgAl₂O₄-Al₂O₃ system," Proceedings of the Unified International Technical Conference on Refractories, UNITECR 2013, pp. 303-308, John Wiley and Sons Inc., Sep 2014.
The definitive version is available at https://doi.org/10.1002/9781118837009.ch53
13th Biennial Worldwide Congress on Refractories 2013 (2013: Sep. 10-13, Victoria; Canada)
Materials Science and Engineering
Keywords and Phrases
Aluminum oxides; Elevated temperature; Material processing; Metastabilities; Metastable region, Aluminum
International Standard Book Number (ISBN)
Article - Conference proceedings
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01 Sep 2014