Effect of composite micro-powder added with α-Al2O3 and zirconium basic carbonate on the structure and properties of corundum castable

Optimization of corrosion resistance and mechanical properties of Al2O3‐Cr2O3 refractories for waste incinerator

“… $$$$\begin{equation}{\eta }_\gamma = {\left( {1 - \frac{\lambda }{{{\phi }_T}}} \right)}^{ - {{[\eta ]}}_1{\phi }_T},\end{equation}$$$$where η γ is the relative viscosity, Φ T is the maximum packing fraction, [η] 1 is first‐order intrinsic viscosity, and λ is the volume fraction of the solid fine dispersion in the molten corrosion reagent. According to Equation (), ZrO 2 (melting point 2700°C) particles elevated the volume fraction of solid fine dispersion ( λ ) in molten corrosion reagent of sample Z4 compared with that in sample Z1, leading to the increased viscosity of molten corrosion reagent 42 . The wrapped layer from ZrO 2 particles in corroded sample Z4 are shown in Figure 15(B).…”

“…Combined with the above analysis (Figure 7), the impregnated ZrO 2 particles filled the pores and cracks of samples during the vacuum impregnation process, resulting in the significantly increased amounts of submicron‐sized pores in sample Z0‐Z4 (14.89–32.45 vol%), which is beneficial to inhibit the corrosion to refractories by molten corrosion reagent. Meanwhile, these submicron‐sized pores reached the saturation state rapidly by absorbing the molten corrosion reagent due to the high specific surface energy, which activated the formation of numerous second‐phase during the reaction process between molten corrosion reagent and refractories, resulting in the significantly decreased penetration depth by the molten corrosion reagent 42 . Therefore, compared with sample Z0, the corrosion and penetration resistance to molten corrosion reagent for Al 2 O 3 ‐Cr 2 O 3 refractories were enhanced due to the reduced pore size and increased small‐sized pores by vacuum impregnated with zirconia sol.…”

“…Meanwhile, these submicron-sized pores reached the saturation state rapidly by absorbing the molten corrosion reagent due to the high specific surface energy, which activated the formation of numerous second-phase during the reaction process between molten corrosion reagent and refractories, resulting in the significantly decreased penetration depth by the molten corrosion reagent. 42 Therefore, compared with sample Z0, the corrosion and penetration resistance to molten corrosion reagent for Al increased viscosity of molten corrosion reagent. The increased viscosity of molten corrosion reagent reduced its fluidity and diffusion rate in refractories, which was beneficial to inhibit the corrosion and penetration of Al 2 O 3 -Cr 2 O 3 refractories by molten corrosion reagent.…”