Paper number 891

FLUIDITY AND CASTABILITY STUDIES ON AL-SICP COMPOSITES

U.T.S. PILLAI, J. DUSZCZYK AND L. KATGERMAN

Regional Research Laboratory (CSIR)
Industrial Estate (P.O.), hiruvananthapuram - 695 019,India
Email : pillai@csrrltrd.ren.nic,in
Laboratory of Materials Science
Faculty of Applied Sciences Rotterdamsweg 137
2600 GA Del& The Netherlands

Summary Al-Si-Sic particulate reinforced metal matrix composites are gaining wide acceptance in automotive and aircraft industries. Components made out of these composites are mainly produced through casting method, because it is an easy and economical method compared to other fabrication method. To produce sound castings with unifbrm dispersion of particles, it is necessary to learn more about the casting factors and their characteristics. The critical casting factors that intluence the castings are the fluidity and castability. In the present investigation, the fluidity and castability studies have been carried out for high silicon (9,15,20,25 wt%) added Duralcan composites by gravity casting and low pressure casting (LPC) methods, using standard spiral sand mould and metal moulds. It has been found that in both the gravity casting and low pressure casting methods, the fluidity and the castability are found to increase with the silicon level present in the composites. The castability of the composite is fbund to increase linearly with increase in temperature for the range of temperature studied (730,740,76OC). Increase in c&ability with the filling rate (6mmkc, 12mm/sec, 18mmkc) is noticed during LP casting using strip moulds used fbr castability studies. With increasing the thickness of strip castings, the castability is hund to increase by gravity casting and Low Pressure Casting methods. More details on these studies will be reported in the paper.
Keywords aluninum-matrix composites, silicon carbide (SiC), particle-reinforced composites, fluidity, castability.

Theme : Metal Matrix Composites ; Processing and Forming

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