Enhancing hydration resistance and mechanical properties of dolomite refractory through ZnO nanoparticle incorporation

Abstract

The study aims to enhance the hydration resistance of dolomite refractory by investigating the influence of ZnO nanoparticles on their physical and mechanical properties. Four samples with varying ZnO concentrations (0, 0.5, 1, and 2 wt%) were prepared. The main identified phases were magnesia (MgO) and lime (CaO). The microstructure of the dolomite refractory shown irregularly shaped grains dispersed within a matrix phase, with an increase in ZnO nanoparticles, leading to larger and more abundant grains. The incorporation of ZnO nanoparticles resulted in improved density, hydration resistance, and cold compressive strength, attributed to a reduction in porosity. The sample containing 2 wt% ZnO nanoparticles displayed the highest cold compressive strength and thermal expansion coefficient compared to the pure sample. The addition of ZnO enhanced the dolomite's compressive strength by approximately 46%. These findings suggest that ZnO nanoparticles can enhance the properties of dolomite refractory, particularly in terms of hydration resistance.