Reaction of some Oxide Ceramics with Molten Aluminium

Yusuke Ishii, Takayuki Ban, Yutaka Ohya

Gifu University, Gifu 501­1193/Japan

Revision

Volume 10, Issue 2, Pages 43 - 47

Abstract

TiO2, Y2Ti2O7, Y2O3 and MgO ceramics are immersed into molten aluminium at 1000 °C for 25 h and the reaction of the ceramics was investigated. According to an Ellingham diagram, TiO2 should be reduced, and MgO and Y2O3 should not be reduced by molten aluminium. In an actual reaction of these ceramics with molten aluminium, a reaction at the interface between these ceramics and molten aluminium is very important. At the interface of TiO2 and Y2 Ti2O7, a corundum layer was formed, and this layer prevents further reaction. Y2O3 and MgO ceramics reacted with Al to form oxide compounds, metallic Y, and Mg in molten aluminium.

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Keywords

molten aluminium, reduction, MgO, Y₂O₃ TiO₂, Ellingham diagram

References

[1] Yamamoto, S.; et al.: Corrosion of aluminium titanate ceramics by molten aluminium. J. Tech. Assoc. Refractories Jpn. 30 (2010) [3] 162–167 [2] Tanaka, M.; et al.: Effect of grain boundary cracks on the corrosion behaviour of aluminium titanate ceramics in a molten aluminium alloy. Corrosion Sci. 54 (2012) 90–96 [3] Kato, E.; Daimon, K.; Takahashi, J.: Decomposition temperature of β­Al₂TiO₅. J. Amer. Ceram. Soc. 70 (1987) 33–37 [4] Barzilai, S.; et al.: Interface phenomena in the Y₂O₃/(Al–Cu) system. Mater Sci Engin. A420 (2006) 291–295 [5] Wojewoda­Budka, J.; Sobczak, N.; Morgiel, J.: Interactions between molten aluminium and Y₂O₃ studies with TEM techniques. J. Microscopy 237 (2010) [3] 253–257 [6] Wojewoda­Budka, J.; et al.: Interaction between liquid aluminium and yttria substrate: microstructure characterization and thermodynamic considerations. J. Mater. Sci. 45 (2010) 2042–2050 [7] Yamaguchi, G.: Reactivity of solids. Chap 5. Kagaku Sosetsu 9. Chem. Soc. Jpn. Tokyo 1975 (in Japanese)

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