Features of Synthesis of a Metal-Matrix Composite Based on Natural Calcium Carbonate

Abstract

The possibility of using calcite-shell limestone, widespread in the territory of Tajikistan, as a filler for an aluminum matrix in the synthesis of a metal matrix composite has been studied. The use of aluminum as a matrix allows for the production of the composite at a relatively low temperature (700 °C), avoiding the intense decomposition of calcium carbonate, which begins at 800-900 °C. The structural and phase changes of the material during the activation and modification of calcite have been studied. It has been shown that the modification of the calcite surface enhances the interfacial interaction between the filler and the aluminum matrix, improving adhesion and the efficiency of mechanical stress transfer. It has been established that a composite material consisting of 20 wt.% aluminum and 80 wt.% calcite with a thickness of 10 mm provides the greatest attenuation of gamma- and X-ray radiation. The reduction in the dose rate from an open source from 1490 to 135 µSv/h (approximately 11 times) indicates the pronounced radiation protec-tion properties of the developed material.