Abstract
Dry mixing of δ-alumina and SiC short fibres with a powder metallurgy processed aluminium alloy was performed aiming to provide a homogeneous powder material for subsequent consolidation. The major problem was to deagglomerate the clustered fibres, realizing that fibre aspect ratio should not be sacrificed to too large an extent during this first processing step. The mixing was tackled by co-processing the materials in a cylindrical tumbler operating either with or without ceramic balls. This comes down to applying two differing intensities of mechanical action. Particle size, shape, hardness and specific surface area of the materials were measured after ball milling, which was a successful deagglomeration process only for the δ-alumina fibre.
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ter Haar, J.H., Duszczyk, J. Case study of dry mixing of δ-alumina (‘Saffil’) and silicon carbide (‘Nicalon’) fibres with a rapidly solidified Al-20Si-X powder. J Mater Sci 26, 3628–3638 (1991). https://doi.org/10.1007/BF00557155
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DOI: https://doi.org/10.1007/BF00557155