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.

对低成本增强材料的需求不断增加，鼓励使用废弃的副产品，如鸡蛋壳。废蛋壳的化学成分（含有 95% CaCo ₃ ）具有低密度、高硬度、高熔点和最容易获得的特点，使其成为用于金属基复合材料 (MMC) 的合适替代增强材料。在这项工作中，利用球磨和碳化废鸡蛋壳粉开发镁合金表面复合材料。通过摩擦搅拌处理。开发的材料通过搅拌区、热机械影响区、热影响区的显微图像和通过 X 射线衍射的结构分析进行验证。该材料的热特征在于不同温度 (50 °C–400 °C) 和不同端电压 (100 V–250 V) 下的热导率、热膨胀系数以及差热分析、热重分析和导数热分析。重量分析。结果揭示了热导率和热膨胀系数的下降趋势，分别在96 至 48 W/mK 和 28.92 至 23.5 × 10^-6 K^{-1 的范围内}，温度从 50 °C 升高到 400 °C C 和增加蛋壳粉百分比。