Matrix microstructure optimization of alumina-spinel castables and its effect on high temperature properties

Wang, Yulong; Li, Xiangcheng; Chen, Pingan; Zhu, Bin

doi:10.1016/j.ceramint.2017.10.010

Cited by 23 publications

(5 citation statements)

References 29 publications

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“…The presence of microsilica on the corrosion behavior preformed and in situ–based castable showed poor performance. Castable samples with preformed spinel grain showed poor corrosion behavior among four castable compositions 89 as reported by Wang et al. Kalpaklı 90 observed in situ spinel‐based castable with 6‐wt.% MgO addition showed better slag corrosion resistance than 25 wt.% synthetic spinel addition (AR 78).…”

Section: Properties Of Alumina‐spinel Castablessupporting

confidence: 61%

Alumina‐spinel castable for steel ladles: An overview

Kumar

Sarkar

2022

Int J Applied Ceramic Tech

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Alumina‐spinel castable has excellent refractory properties, including high volume and thermal stability, good hot strength, and excellent resistance against corrosion, erosion, and thermal spalling. Excellent refractory properties have made it a preferred lining for steel ladles, reducing the erosion and corrosion of molten metal and slag and improving the ladle life and efficiency for decades. These castables are also significant for the replacement of chrome‐bearing refractories that cause several health hazards. The current review paper covers preformed and in situ spinel containing alumina castables. It focuses on the importance of these castables in the sidewall and bottom portion of the steel ladle in detail, the effect of spinel and MgO content, and the factors affecting castable properties. The review also covers the final properties of castable and the application areas of alumina‐spinel castable in steel ladle, purging plugs, and RH‐degasser.

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Section: Properties Of Alumina‐spinel Castablessupporting

confidence: 61%

Alumina‐spinel castable for steel ladles: An overview

Kumar

Sarkar

2022

Int J Applied Ceramic Tech

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“…Corundum-spinel castables are widely used in ladle linings because of their excellent mechanical properties, [1][2][3] good thermal stability, [4][5][6] and excellent slag resistance. [7][8][9] For refining ladles, corundum-spinel castables are commonly used in the molten pool area (wall and bottom of the ladle).…”

Section: Introductionmentioning

confidence: 99%

Lightweight corundum–spinel ladle wear lining castable with low thermal conductivity

Wei,

Guo,

et al. 2024

J Am Ceram Soc.

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Designing a lightweight wear‐lining refractory is of great significance for energy savings and consumption reduction. In this study, an in‐house manufactured porous alumina aggregate was selected to replace the commercial tabular alumina aggregate to prepare lightweight corundum–spinel castable (LCSC) for ladle linings. The effect of the porous alumina aggregate on the properties of the corundum–spinel castable was investigated. Compared to tabular alumina, porous alumina possesses higher closed porosity (12.1%) and a small pore size (4.25 µm). The thermal conductivity of LCSC is 21.5% lower than that of dense castable at 1000°C. Owing to the existence of micropores in the porous alumina, the fabricated corundum–spinel castable showed an improved degree of bonding between the aggregate and matrix. Therefore, the lightweight castable showed higher flexural strength and considerable slag corrosion resistance than the dense castable.

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“…These materials directly contact the aggressive slag during the steel ladle operation. Previous studies have revealed that spinel is advantageous for corrosion resistance, and it prevents the dissolution of sidewalls of refractory materials in the steel ladle [ 1 , 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Alumina-Spinel Refractory by Secondary Metallurgical Slag Using Coating Corrosion Test

et al. 2022

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In this paper, the corrosion mechanism of commercial alumina-spinel refractory was investigated at 1350 and 1450 °C. Disc samples were coated with shells of two different slags containing 4 and 10 wt.% SiO2. The after-corrosion refractory was investigated in view of changes in its microstructure and phase composition by SEM/EDS and XRD techniques, respectively. At 1350 °C slags slightly infiltrated the microstructure, whereas at 1450 °C slags infiltrated the alumina-spinel refractory causing its significant corrosion. As a result of corrosion, new phases were formed, including calcium dialuminate (Ca2Al4O7), calcium hexaluminate (CaAl12O19), and gehlenite (Ca2AlSi2O7). Formation of calcium aluminate layers in the microstructure of the refractory inhibited further dissolution of alumina aggregates; however, expansive behavior of CaAl12O19 raised the microstructure porosity. The additional SiO2 in the slag doubled the amount of low melting gehlenite in the matrix, accelerating the corrosion process of alumina-spinel brick at high temperatures.

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Matrix microstructure optimization of alumina-spinel castables and its effect on high temperature properties

Cited by 23 publications

References 29 publications

Alumina‐spinel castable for steel ladles: An overview

Alumina‐spinel castable for steel ladles: An overview

Lightweight corundum–spinel ladle wear lining castable with low thermal conductivity

Corrosion of Alumina-Spinel Refractory by Secondary Metallurgical Slag Using Coating Corrosion Test

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