Corrosion behavior and mechanism of alkaline melt on aluminosilicate materials containing B4C powder

Abstract

Alkali attack to refractory lining of the incinerator will severely decrease its service life. Utilizing high viscosity phase produced in refractory to suppress corrosion of molten salt is an important method. In this study, 1 wt%, 1.5 wt% and 2 wt% B4C powder were respectively introduced into aluminosilicate material, its effect on the microstructure and property of the material were analyzed and discussed. The static crucible method used K2CO3 as corrosion flux was employed to conduct corrosion experiments at 1000 °C. The results show that the B2O3 glass layer is formed in the surface of the specimens due to B4C oxidation. It inhibits O2 infiltration and causes different structure between the inner and outer layers. The high viscosity B2O3 can inhibit penetration of molten salts by adhesion effect. The penetration resistance will be improved with increase of B4C content, and 2 wt% B4C demonstrates excellent effect.