Improved properties of low‐carbon MgO‐C refractories with the addition of multilayer graphene/MgAl<sub>2</sub>O<sub>4</sub> composite powders

Ding, Donghai; Lv, Lihua; Xiao, Guoqing; Luo, Jiyuan; Lei, Changkun; Ren, Yun; Yang, Shoulei; Yang, Piaoping; Hou, Xing

doi:10.1111/ijac.13347

Cited by 33 publications

(8 citation statements)

References 23 publications

(34 reference statements)

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“…The reinforcement effect on the thermal shock resistance of low‐carbon carbon‐containing refractories from literature and this work 18,23,26,33,34 . *MA is MgAl 2 O 4 .…”

Section: Discussionmentioning

confidence: 94%

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Feng,

Xiao,

Ding

et al. 2024

J Am Ceram Soc.

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The CNTs/MgAl2O4 whiskers composite reinforcement was prepared by catalytic carbon‐bed sintering and added to low‐carbon Al2O3‐C refractories to enhance the thermal shock resistance of refractories. The effects of Ni(NO3)2·6H2O content on the phase and microstructure of CNTs/MgAl2O4 were investigated. The nano‐indentation technology was used to quantitatively evaluate the effect of CNTs/MgAl2O4 on the thermal shock resistance of low‐carbon Al2O3‐C refractories, and the toughening mechanism of CNTs/MgAl2O4 on refractories was further investigated. The results revealed that the inner and outer diameters of the CNTs were approximately 5.69 and 16.26 nm, respectively. The CNTs winded around interlocking structural MgAl2O4 whiskers with a high aspect ratio (>100), which was beneficial to the dispersion of CNTs in the refractory matrix. The thermal shock resistance of low‐carbon Al2O3‐C refractories was significantly improved by adding 3.0 wt.% of CNTs/MgAl2O4 (named C3). The specific fracture energy of refractory matrix and residual strength ratio of C3 reached 141 N·m−1 and 39.2%, which were 29.4% and 97.0% higher than those of the blank sample (109 N·m−1 and 19.9%), respectively. This is because the refractory matrix was significantly reinforced by CNTs and MgAl2O4 whiskers, promoting the occurrence of “bridging” and “crack deflection” and the generation of microcracks in the refractory matrix.

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“…The reinforcement effect on the thermal shock resistance of low‐carbon carbon‐containing refractories from literature and this work 18,23,26,33,34 . *MA is MgAl 2 O 4 .…”

Section: Discussionmentioning

confidence: 94%

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Feng,

Xiao,

Ding

et al. 2024

J Am Ceram Soc.

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“…However, with the MA‐CA 2 addition further increased to 6 wt%, the slag corrosion index decreased instead. This may be because the dissolution of MA‐CA 2 addition caused an increased Al 2 O 3 content in the molten slag, resulting in a retarded slag corrosion to MgO‐C refractories 18,19 . With the MA‐CA 2 addition continued increasing to 8 wt%, a deeper slag corrosion was detected owing to the excessive liquid contents in the sample.…”

Section: Resultsmentioning

confidence: 99%

Improvement of low carbon MgO‐C refractories by MA‐CA₂ additives fabricated from metallurgical waste

Tang

et al. 2021

Int J Applied Ceramic Tech

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In the present work, MA-CA 2 material was fabricated by adding industrial alumina into industrial waste residue, and its effect on the physical properties, oxidation resistance, slag resistance, and thermal shock resistance when it was added to the composition of a low carbon MgO-C refractory was discussed in detail. Although the introduction of MA-CA 2 material led to a slight inferior slag corrosion resistance, the volume stability and oxidation resistance of refractories were improved. Moreover, the samples containing MA-CA 2 addition showed significantly lower thermal expansion coefficients and increased thermal shock resistance performance. However, owing to the dissolution of SiO 2 impurity into the MA-CA 2 material, an excessive addition of MA-CA 2 material would increase the liquid phase amount in the sample during the heat treatment and slag attack, resulting in a performance degradation. In this study, the best comprehensive performance of the MgO-C refractory was obtained with 6 wt% MA-CA 2 addition. K E Y W O R D Slow carbon MgO-C refractories, MA-CA 2 materials, slag corrosion, thermal shock resistance, waste industrial residue TANG eT Al.

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“…This shows that the introduction of Al 2 O 3 -SiC powder is beneficial to increase the One is that the micron-sized Al 2 O 3 -SiC powder has higher dispersibility, and it can form a more densely packed structure by filling the pores and cracks between the MgO aggregates. 21 The other is that Al 2 O 3 in the powder can react with the MgO matrix to form spinel, and the volume expansion effect caused by this reaction between Al 2 O 3 and MgO can further effectively reduce the porosity inside the MgO-C samples. 22 Conversely, due to excessive volume expansion, the apparent porosity of samples M5 and M7.5 increases slightly.…”

Section: Effects Of As-synthesized Al 2 O 3 -Sic Powder On the Physic...mentioning

confidence: 99%

Synthesis of Al₂O₃‐SiC powder from electroceramics waste and its application in low‐carbon MgO‐C refractories

Ren

Zhi

et al. 2021

Int J Applied Ceramic Tech

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Composite additives are an efficient means to improve the high‐temperature stability and slag resistance of low‐carbon MgO‐C refractories. In this work, Al2O3‐SiC powder was firstly synthesized from electroceramics waste by carbon embedded method at 1500°C, 1550°C, and 1600°C for 4 h, and then the as‐synthesized Al2O3‐SiC powder was used as an additive to low‐carbon MgO‐C refractories. The effects of its addition amounts of 0, 2.5 wt.%, 5.0 wt.%, and 7.5 wt.% on the properties of the refractories were investigated in detail. It was found that increasing the heat treatment temperature is beneficial to the phase conversion of mullite and quartz to alumina and silicon carbide in the electroceramics waste. Furthermore, the addition of Al2O3‐SiC powder effectively improves the performance of low‐carbon MgO‐C samples, and the formation of spinel dense layer and high‐viscosity isolation layer is the internal reason for the improvement of the oxidation resistance and slag resistance of low‐carbon MgO‐C samples. This work provides ideas for the reuse of electroceramics waste and presents an alternative strategy for the performance optimization of low‐carbon MgO‐C refractories.

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Improved properties of low‐carbon MgO‐C refractories with the addition of multilayer graphene/MgAl₂O₄ composite powders

Cited by 33 publications

References 23 publications

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Improvement of low carbon MgO‐C refractories by MA‐CA₂ additives fabricated from metallurgical waste

Synthesis of Al₂O₃‐SiC powder from electroceramics waste and its application in low‐carbon MgO‐C refractories

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Improved properties of low‐carbon MgO‐C refractories with the addition of multilayer graphene/MgAl2O4 composite powders

Cited by 33 publications

References 23 publications

Enhanced thermal shock resistance of low‐carbon Al2O3‐C refractories via CNTs/MgAl2O4 whiskers composite reinforcement

Enhanced thermal shock resistance of low‐carbon Al2O3‐C refractories via CNTs/MgAl2O4 whiskers composite reinforcement

Improvement of low carbon MgO‐C refractories by MA‐CA2 additives fabricated from metallurgical waste

Synthesis of Al2O3‐SiC powder from electroceramics waste and its application in low‐carbon MgO‐C refractories

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Improved properties of low‐carbon MgO‐C refractories with the addition of multilayer graphene/MgAl₂O₄ composite powders

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Improvement of low carbon MgO‐C refractories by MA‐CA₂ additives fabricated from metallurgical waste

Synthesis of Al₂O₃‐SiC powder from electroceramics waste and its application in low‐carbon MgO‐C refractories