Enhanced corrosion resistance through the introduction of fine pores: Role of nano-sized intracrystalline pores

Novel phenomenon of quasi‐volcanic corrosion on the alumina refractory‐slag‐air interface

“…where M i is the molecular mass of component i (g/mol), x i is the mole fraction of component i, and ρ i is the density of component i (g/cm 3 ). In addition, α v can be calculated using the following equation 29 :…”

“…Refractory usually serves as lining material to ensure safe and efficient production in high-temperature industries. [1][2][3] Melt corrosion is one of the main forms of refractory wear, especially slag corrosion caused by the Marangoni convection at the refractory-slag-air/metal three-phase interface in various metallurgical processes, [4][5][6][7][8] for instance, the slag line attack in Basic Oxygen Steelmaking (BOS) vessels and the corrosion at the interface of steel ladles and other furnaces containing molten metal and slag in contact with refractories. [9][10] Liquid flow induced by the Marangoni effect is known as Marangoni convection (or flow), and it has attracted considerable interest in research and in industries.…”

Corrosion Behavior of Lightweight MgO in High Basicity Tundish Slag

“…In addition to the excellent thermal insulation and the lower density, the lightweight refractory containing micropores also possesses other superiorities even better than dense refractory, such as the higher mechanical strength, [ 10 ] the better thermal resistance, and the stronger slag resistance. [ 11–13 ] It has been reported that the mechanical strength and the thermal resistance can be enhanced by adding additives such as ZrO 2 . [ 14 ] These results provide potential value for lightweight refractories as tundish lining.…”

“…Fu et al have explored the corrosion behavior of three types of lightweight refractories (alumina, magnesia, and bauxite) in 31wt%CaO–38.5wt%Al 2 O 3 –11wt%SiO 2 –2wt%MgO–2.5wt%MnO–15wt%Fe 2 O 3 slag at 1600 °C, and demonstrated that the nanosized pores can accelerate the supersaturation of molten slag and enable the solid phases to precipitate out rapidly. [ 11,27 ] Then a continuous solid layer generates and prevents the further slag penetration. The continuous solid layer is also called as isolation layer.…”

Corrosion resistance and anti‐reaction mechanism of Al2O3‐based refractory ceramic under weak static magnetic field

“…2,7 In particular, CaO-Al 2 O 3 -SiO 2 slag with a high Al 2 O 3 content and a C/S ratio (CaO wt%/SiO 2 wt%) ≥2.6, the 'melts volcano' with a macroscale continuous peak pattern at the three-phase interface of alumina refractory-melts-air formed due to the intensified convection and the severe upwelling corrosion of the alumina crucible, which is different from formal corrosion, and drastically reduced the service life of the alumina crucible. 8,9 The slag corrosion resistance of refractories can be improved and optimized by the regulation and control of their composition and structure, [10][11][12][13] such as by whisker reinforcement and microporosization.…”