Interfacial reactions and wetting in Al-Mg/oxide ceramic interpenetrating composites made by a pressureless infiltration technique

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Abstract

The present paper considers the microstructures of Al-Mg/oxide ceramic interpenetrating composites made by a pressureless infiltration technique. The composites were produced using an Al-10 wt.% Mg alloy with two oxide ceramic foams, spinel (MgAl 2O 4) and mullite (Al 6Si 2O 13), at 915°C in a flowing N 2 atmosphere. Full infiltration of the aluminium alloy into the ceramic preform has been achieved with good bonding between the metal and ceramic phases. The composites were characterised by a range of techniques and compared with those for alumina from the literature. It has been found that the metal-ceramic interface of the composite consisted of an oxide layer near the ceramic phase and a nitride layer from Mg 3N 2 to AlN near the metal phase. The improvement of Al wetting and adhesion on the oxide ceramics by the addition of Mg and in the presence of N 2 was studied by a sessile drop technique to clarify which compound that formed at the interface contributed to the spontaneous infiltration. © 2012 Elsevier Ltd.

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Liu, J., Binner, J., Higginson, R., & Zhou, Z. (2012). Interfacial reactions and wetting in Al-Mg/oxide ceramic interpenetrating composites made by a pressureless infiltration technique. Composites Science and Technology, 72(8), 886–893. https://doi.org/10.1016/j.compscitech.2012.02.018

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