Production of Cement Based on Calcium Aluminate by Means of Solid State Reactions

Through powder techniques and in situ solid state reactions, a refractory cement CaAl2O4-based was fabricated, using CaCO3 extracted from chicken eggshells Al as precursor materials. To reduce the particle size achieve homogeneous mixture, powders were subjected to high-energy milling planetary mill. The resulting grinding compacted form cylindrical tablets. These samples pressureless sintered air. A distribution analysis indicates that they obtained particles ranging nanometers 2 microns. Differential thermal decomposition of begins at 953 K ends 1073 K, situation confirmed by X-ray diffraction analysis, latter also indicating formation CaAl2O4 crystalline phase is completed 1773 K. microstructure observed scanning electron microscope shows equiaxial grains flakes sizes 1 average density hardness material 3.08 g/cm3 430 HV, respectively. With regard shock tests, showed cracks cooling with temperature gradients 873