Abstract
Directed melt oxidation is a new and versatile technique for the preparation of various ceramic matrix composites. The present work deals with the interaction of molten aluminium with α-Al 2O 3 preforms to produce dense Al 2O 3/Al bearing composites. A commercial 5052 Al alloy having the composition Al-2.5% Mg was used. Studies were carried out on the melt infiltration behaviour and microstructural evolution of the composites as a function of the preform pore size. A typical growth rate of ≈ 10.0 μm min −1 was obtained by using alumina compacts of mean pore diameter 2.2 μm. The oxidation product, as analysed by TEM, shows the ultra-fine (≈0.25 μm) and isometric grain network of α-Al 2O 3. The clean and sharp grain boundary features are the most significant aspects of this process.
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