Influence of thermal damage occurrence at microstructural scale on the thermomechanical behaviour of magnesia–spinel refractories

Preparation and characterization of porous MgO–Al2O3 refractory aggregates using an in-situ decomposition pore-forming technique

“…MgO-Al 2 O 3 refractories are widely used as working linings of high temperature vessels, e.g., periclase-spinel refractories for cement rotary kilns and corundum-spinel refractories for steel ladles [1][2][3][4][5][6]. However, the shell temperature at the external surface of the vessels could exceed 300-400 1C in service leading to severe heat loss because these MgO-Al 2 O 3 refractories are manufactured by using dense aggregates as main raw materials.…”

The fabrication of porous corundum spheres with core-shell structure for corundum-spinel castables

“…The calculated value for ρ s is equal to 3.504 g/cm 3 . The median pore diameters of porous and tabular corundum are 6.47 and 0.95 μm (Fig.…”

“…Corundum-spinel castables (CSCs) are widely used as working linings of steel ladles due to their excellent properties, such as good thermal stability, high corrosion, and wear resistance [1][2][3][4]. However, the high thermal conductivity of CSC usually results in a striking decrease of temperature of the molten steel in the steel ladles and leads to high temperature of the shell at the external surface of steel ladles [5,6].…”

“…Yan et al [8] prepared porous MgO-Al 2 O 3 refractory aggregates containing 30-92 wt.% Al 2 O 3 via an in-situ decomposition pore-forming route with magnesite and Al(OH) 3 being used as starting raw materials. The use of these lightweight aggregate has positive effect on the heat-shielding performance of wear lining of steel ladles.…”

Investigation of the impact of micro-cracks on fracture behavior of magnesia products using wedge splitting test and digital image correlation

“…The behavior of magnesia spinel is related to their microstructure and especially to the difference between the thermal expansion of magnesia and spinel which is behind the development of micro-cracks around the spinel grains and can prevent crack propagation generated by thermal shock. [4][5][6][7] Moreover, their microstructure induces a significant non-linear stress-strain mechanical behavior allowing a high strain to rupture, high fracture energy and as a consequence improves their thermal shock resistance. It has been reported that microcracking caused by the addition of spinel reduces both strength and stiffness, and affect the fracture behavior.…”