Improvement the Chemical Resistance of Furnaces Bricks for Petroleum Refineries by ZrO2-Nano- Glass-Ceramic Coated

Abstract

Partial Stabilized Zirconia (PSZ) was prepared from adding 3 wt % of MgO or adding 8 wt% of Y2O3 to 90 wt % ZrO2 Powder and mixed by wet method, then dried and firing mixture to 1500C to obtain PSZ ceramic powder. Glass-Ceramic (Li2SiO3) and (LiAlO2) prepared by dissolve lithium carbonate and lithium hydroxide with Nano-Silica (SiO2) and Nano-Alumina (Al2O3) respectively. Those glass-ceramic mixed with PSZ in different percentage (2.5,5,7.5,10) and sprayed on furnaces bricks for petroleum refineries. An increase in the chemical resistance of the acid on the surface of the Refractory bricks was observed when coating with the glass-ceramic mixture, as well as increasing the hardness and thermal shock resistance. Lithium silicate coated specimens are more spared and homogeneous on the surface compared to lithium laminate coated.