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

Chen, Huan; Zhao, Liancheng; He, Xuan; Fang, Wei; Lei, Zhongxing; Chen, Hui

doi:10.1016/j.matdes.2015.07.033

Cited by 34 publications

(15 citation statements)

References 28 publications

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“…Calcium aluminate‐bonded refractory castables‐containing MgAl 2 O 4 spinel show good thermomechanical properties, superior thermal shock resistance, and high resistance to molten slag . These excellent properties are attributed to the low coefficient of thermal expansion (7.6×10 −6 /K), high value of elastic modulus, and good high‐temperature strength of spinel.…”

Section: Introductionmentioning

confidence: 99%

“…Calcium aluminate-bonded refractory castables-containing MgAl 2 O 4 spinel show good thermomechanical properties, superior thermal shock resistance, and high resistance to molten slag. [1][2][3][4][5] These excellent properties are attributed to the low coefficient of thermal expansion (7.6910 À6 /K), high value of elastic modulus, and good high-temperature strength of spinel. In addition, spinel is capable of trapping large amounts of bivalent and trivalent ions (e.g., Mn 2+ , Fe 2+ , and Fe 3+ ) from slag to improve the slag resistance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of submicron spinel powders on the microstructure evolution and properties of alumina‐based refractory castables

Chen

Wang

et al. 2017

Int J Applied Ceramic Tech

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The physical properties, including flow value, apparent porosity, and mechanical strength, increased significantly with submicron spinel contents in this study. The excellent physical properties can be attributed to the close‐packed microstructure and high bonding strength between spinel and aggregates/matrix. Additionally, the submicron spinel powders promoted the formation of tabular CA6 grains that generated a cross‐linked structure and enhanced the mechanical properties. The microstructures of corroded castables suggested that submicron spinel powders contributed to the formation of a continuous and thick spinel layer at the slag–refractory interface and subsequently improved the slag resistance of the castables.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of submicron spinel powders on the microstructure evolution and properties of alumina‐based refractory castables

Chen

Wang

et al. 2017

Int J Applied Ceramic Tech

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“…MgO-Al 2 O 3 refractories are widely used as working linings for high-temperature furnaces due to their excellent mechanical and thermo-mechanical properties as well as due to remarkable slag resistance. [1][2][3][4][5][6][7][8][9][10][11] The MgO-Al 2 O 3 refractories used for working linings of high-temperature furnaces usually consist of dense MgO-Al 2 O 3 aggregates and matrices, which have high thermal conductivities. The high thermal conductivities often cause immense heat losses through the linings of high-temperature furnaces, which is not conducive to energy-saving and emission-reduction.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and strengths of microporous MgO‐Al₂O₃ refractory aggregates using two types of magnesite

Chen

Yan

Dai

et al. 2020

Int J Applied Ceramic Tech

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Six microporous MgO-Al 2 O 3 refractory aggregates were prepared with Al(OH) 3 and two different types of magnesite powders via an in-situ decomposition pore-forming technique. One magnesite powder contained more CaO (Magnesite C), the other one contained more SiO 2 and Al 2 O 3 impurities (Magnesite SA). Effects of magnesite powder type and content (11 wt.%, 36 wt.% and 77 wt.%) on the phase compositions, microstructures and mechanical strengths of the prepared microporous aggregates were investigated by X-ray diffractometry (XRD), mercury porosimetry measurements, and scanning electron microscopy (SEM), etc. With the addition of 11 wt.% and 77 wt.% magnesite, the type of magnesite had only a small effect on the microporous corundum-spinel and periclase-spinel aggregates, while great influence on the microporous spinel aggregates was observed with 36 wt.% addition. This was mainly because of the sintering process with liquid phase. The best microporous MgO-Al 2 O 3 refractory aggregates, which had an apparent porosity of 39.1%, a median pore size of 3.38 μm and a compressive strength of 66.3 MPa, were prepared by using 36 wt.% Magnesite C. This work has practical significance for the efficient utilization of magnesite and the development of energy-saving lightweight MgO-Al 2 O 3 refractories. K E Y W O R D S in-situ decomposition pore-forming technique, magnesite powders, microporous MgO-Al 2 O 3 refractory aggregates, microstructures, properties Department of Education's Scientific Research Plan (Grant No. D20181106) for financially supporting this work.

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“…The lightweight periclase‐spinel castable exhibited the best resistance to slag corrosion but the worst resistance to slag penetration, while the lightweight alumina‐spinel castable had the best resistance to slag penetration and the worst resistance to slag corrosion . Chen et al fabricated porous alumina spheres with microporous shells and macroporous cores. Because of the microporous shells, the lightweight Al 2 O 3 ‐MgO castable containing these porous alumina spheres exhibited slag resistance similar to that of a typical dense Al 2 O 3 ‐MgO castable (DAMC).…”

Section: Introductionmentioning

confidence: 99%

Corrosion mechanism of lightweight microporous alumina‐based refractory by molten steel

Zou

Huang

et al. 2018

J Am Ceram Soc

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Lightweight refractory linings for industrial furnaces have become important subjects of development in high‐temperature industries. The reaction mechanism between a lightweight microporous alumina‐based refractory material and molten steel was investigated in this study. The main mechanism of refractory damage was structural spalling, caused by steel penetrating the pores. The many micropores in lightweight microporous alumina have high specific surface area and reactivity, inducing the formation of FeO–Fe2O3–Al2O3 phases. This impeded the further penetration of molten steel and the direct dissolution of refractory oxides, promoting greater resistance to molten steel than that shown by common tabular alumina‐based refractories, in which Fe does not react and steel penetration through the pores cannot be retarded.

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

Cited by 34 publications

References 28 publications

Effect of submicron spinel powders on the microstructure evolution and properties of alumina‐based refractory castables

Effect of submicron spinel powders on the microstructure evolution and properties of alumina‐based refractory castables

Microstructures and strengths of microporous MgO‐Al₂O₃ refractory aggregates using two types of magnesite

Corrosion mechanism of lightweight microporous alumina‐based refractory by molten steel

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

Cited by 34 publications

References 28 publications

Effect of submicron spinel powders on the microstructure evolution and properties of alumina‐based refractory castables

Effect of submicron spinel powders on the microstructure evolution and properties of alumina‐based refractory castables

Microstructures and strengths of microporous MgO‐Al2O3 refractory aggregates using two types of magnesite

Corrosion mechanism of lightweight microporous alumina‐based refractory by molten steel

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Microstructures and strengths of microporous MgO‐Al₂O₃ refractory aggregates using two types of magnesite