Abstract
The increasing demand for low-cost reinforcements emboldens the use of waste byproducts such as chicken eggshells. The chemical composition of the waste eggshell (contains 95% CaCo3) with low density, high hardness, high melting point and its easiest availability makes it a suitable alternative reinforcement to use in the metal matrix composites (MMCs). In this work, the ball-milled and carbonized waste chicken eggshell powder is used to develop the surface composites of magnesium alloy by friction stir processing. Developed material was validated by microscopic images of stir zone, thermomechanical affected zone, heat-affected zone and structural analysis by X-ray diffraction. The material is thermally characterized by thermal conductivity at varying temperatures (50 °C–400 °C) and varying terminal voltage (100 V–250 V), coefficient of thermal expansion along with differential thermal analysis, thermo-gravimetric analysis and derivative thermo-gravimetric analysis. The results revealed the decreasing trend of thermal conductivity and coefficient of thermal expansion, found in the range of 96 to 48 W/mK and 28.92 to 23.5 × 10-6 K-1, respectively at an increasing temperature from 50 °C to 400 °C and at increasing eggshell powder percentage.
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