Abstract
MgO/AlN composites have been fabricated by directed metal nitridation of Al–Si alloy in flowing N2 at 1473 K. A mixture of magnesia particles and chemically pure magnesium powder was placed on the surface of Al–Si alloy block as reinforcement materials. Mg powder initiates the infiltration and nitridation of Al alloy melt by eliminating protective Al2O3 film at the reaction frontier. New Mg vapor from the interface reaction between Al and MgO particles, keeps as continuous deoxidization agent as the added Mg powder. The spinel layer thickness due to the reaction of Al melt with MgO particles is controlled by Mg content. Si not only reduces the surface tension and viscosity of Al alloy melt, but also leads to increase in N2 content.
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Acknowledgements
The authors thank the financial support of the National Natural Science Fund of China, under Grant No.50572076 and Ministry of Education of China under Grant No.20040488001.
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Li, Y., Jin, S., Liu, G. et al. Behavior of magnesium and silicon in the formation of MgO/AlN composite. J Mater Sci 44, 4155–4161 (2009). https://doi.org/10.1007/s10853-009-3616-3
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DOI: https://doi.org/10.1007/s10853-009-3616-3