| الملخص: | Polyester based hybrid composites is developed using 75 µm sized wood charcoal and periwinkle shell as particulate reinforcements in various proportions of mixture. Hardness, dry sliding wear and morphological examinations were performed on the hybrid composite samples using Brinell hardness tester, pin-on-disc tribometer and SEM-EDX techniques respectively. The results from the study revealed that all the hybrid composites have improved properties over the unreinforced polyester resin and polyester sample reinforced with only wood charcoal at 5 wt% reinforcement concentration. Optimal combination of hardness and wear properties was obtained by the hybrid composite sample reinforced with equal proportions of wood charcoal and periwinkle shell particles. Further additions of periwinkle shell particles over the content of wood charcoal powder in the 25:75 ratio, induced a sharp decrease in hardness and wear properties of the hybrid composites below that of the unreinforced polyester resin. SEM-EDX analysis revealed the presence of varying proportions of carbon, calcium, silicon, potassium, iron and aluminium as the major elements, which resulted in the observed hardness, and wear properties of the hybrid composites. Optimal reinforcement weight fraction and combination of wear parameters required for minimum wear rate and improved hardness was established using one factor RSM design.
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