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Effects of In-Situ-Formed 9Al₂O₃·2B₂O₃ on the Corrosion Resistance of Al₂O₃-Based Porous Ceramic in Molten Aluminum

R. Xiang, Y. Li, D. Xiang, N. Li, S. Li, Y. Li, S. Sang

Journal of Ceramic Science and Technology, Vol. 7, No. 1 (2016), pp. 113-118

DOI: 10.4416/JCST2015-00037

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Abstract

White fused alumina (WFA), α-Al2O3 powder, aluminum hydroxide powder and pseudoboehmite powder (PB) are each mixed with boric acid according to the stoichiometric ratio of 9Al2O3·2B2O3 in order to study the formation process. For the corrosion experiment, Al2O3-based porous ceramic with and without the addition of boric acid is prepared and soaked in molten aluminum for 48 h at 870 °C. The results show that the synthesis temperature of 9Al2O3·2B2O3 is 1000 °C, except for the mixture of PB and boric acid for which the synthesis temperature is 900 °C. The corrosion resistance of the samples with the addition of boric acid in molten aluminum is improved because of the generation of 9Al2O3·2B2O3 around the pores.

Keywords

Porous ceramic, in-situ synthesization, 9Al2O3·2B2O3, molten aluminum, corrosion resistance

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