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 Y 2 O 3 to 90 wt % ZrO 2 Powder and mixed by wet method, then dried and firing mixture to 1500C to obtain PSZ ceramic powder. Glass-Ceramic (Li 2 SiO 3 ) and (LiAlO 2 ) prepared by dissolve lithium carbonate and lithium hydroxide with Nano-Silica (SiO 2 ) and Nano-Alumina (Al 2 O 3 ) 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.

Experimental study of ceramic coatings on lower-density ceramic substrates

“…Ceramic coatings have attracted a great deal of interest as they can develop interesting properties, such as hightemperature strength [1][2][3], improvement of chemical attack [4,5], and water infiltration resistance [6][7][8]. There are several studies on the application of a ceramic coating to reinforce mechanical strength [9][10][11].…”

“…There are several studies on the application of a ceramic coating to reinforce mechanical strength [9][10][11]. Hard ceramic coatings have a wide range of applications, such as turbine blades [12], furnace bricks [5], and pipelines [13]. In addition, functionally gradient materials (FGMs) have been developed to meet the requirement of certain materials for a continuously varying property, such as hardness, dielectric constant, or thermal resistance, from one surface to the other.…”