Microstructures and mechanism of Al2O3/Al composites fabricated by the reaction between SiO2 and molten aluminum

Cheng Xiao-min; Zhang Lian-meng; Chen Tie-qun

doi:10.1007/BF02838458

Journal of Wuhan University of Technology Materials Science Edition ›› 2003, Vol. 18 ›› Issue (3) : 50 -52. DOI: 10.1007/BF02838458

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Microstructures and mechanism of Al₂O₃/Al composites fabricated by the reaction between SiO₂ and molten aluminum

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Abstract

Al₂ O₃/Al composite was fabricated by the reaction between SiO₂ and molten aluminum. The microstructures of the composite obtained under different reaction conditions were analyzed. The formation mechanism of the composite microstructure was discussed. Results show that the reaction kinetics is influenced remarkably by the reaction temperature, reaction time and the quantity of SiO₂. The morphologies of Al₂O₃ have different features, depending on the reaction temperature. The composite has equaxed Al₂O₃ grains when materials reacted below 1200°C, and the composite is composed of a large number of fine Al₂O₃ grains and aluninum. The composite has a frame-shaped Al₂O₃ microstructure at the reaction temperature of above 1250°C.

Keywords

Al₂O₃/Al composite / in-situ reaction / vitreous silica / microstructure

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Cheng Xiao-min, Zhang Lian-meng, Chen Tie-qun. Microstructures and mechanism of Al₂O₃/Al composites fabricated by the reaction between SiO₂ and molten aluminum. Journal of Wuhan University of Technology Materials Science Edition, 2003, 18(3): 50-52 DOI:10.1007/BF02838458

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