Processing and Microstructure Characterization of Bio-Waste Induced Closed-Cell Aluminium/SiC_p Composite Foams

Aluminium closed-cell foams are valued for their low density, high stiffness, corrosion resistance, and recyclability, making them suitable for aerospace, marine, and automotive applications. The quality of these foams depends on raw materials and processing methods. Therefore, employing an efficient and cost-effective processing method and raw materials is vital for ensuring that the foam’s properties are not compromised. This work investigates the use of bio-waste chicken eggshell powder and recycled aluminium alloy as a foaming agent for closed-cell aluminium/SiC_p composite foams. The foams produced are examined for micro & macrostructure and its characteristic mechanical behavior. The influence of SiC_p concentration on foam expansion and stability are investigated. Eggshell powder enabled the aluminium alloy to expand and form foam, further adding SiC_p resulted in the homogeneous distribution of pores with negligible metal drainage.