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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 57  1998
Processing of Al20/Al Interpenetrating Composites
R. BHAT, K. BHANUMURTHY AND S. K. Rov
Pages : 134-136
DOI : 10.1080/0371750X.1998.10804853
Abstract
Microstructural developments duriag the processing of Al20/Al interpenetrating composite by an exchange reaction between silica glass preform and molten aluminium at the temperature range of 1000°-l200°C with varying reaction time between 10 min and 24 h were studied. Reaction was arrested after predetermined times and partly reacted !amples were analyzed for phase composition and microstructure. It is observed that an intermediate phase of several microns thick separates the glass and the composite phases and is consumed in the fully converted composites. This transition phase contain predominantly AI as revealed by EPMA, and seems to act as source of AI for continued reaction with Si02• Small nuclei of the Al20 3 are formed in this phase which subsequently grow and impinge into each other. The space among the Al20 3 crystals are tilled up with molten metal to form dense composite with interpenetrating network of AI and Al20 3• The size of the Al20_, grains are dependent on the temperature of composite formation. No texture formation was obsened.
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