Oxidation Resistance and Wetting Behavior of MgO-C Refractories: Effect of Carbon Content

Liu, Zhaoyang; Yu, Jingkun; Yang, Xiulun; Jin, Endong; Yuan, Lei

doi:10.3390/ma11060883

Cited by 41 publications

(26 citation statements)

References 26 publications

(30 reference statements)

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“…Carbon in the MgO–C refractory can depress the wettability between the refractory and the slag. [ 24,25 ] Therefore, the large consumption of carbon in refractory could lead to the slag penetrated the refractory more easily. Moreover, several studies indicated that the viscosity of molten is of vital importance to the penetration behavior and changed during the smelting process, which is significant to help to understand the internal relationship among the chemical composition, physical property, and corrosion ability of the molten slag.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the thickness of the slag layer on the surface of the MgO particle in refractory sample without pre‐treatment was thin (see Figure 5b) due to the anti‐wetting effect of graphite on molten slag. [ 24,25 ] A microscopic analysis showed that the corrosion depth of the refractory untreated specimen in contact with M1 slag was about 0.28 mm, whereas the corrosion depth for the pre‐treatment specimen was about 1.70 mm.…”

Section: Resultsmentioning

confidence: 99%

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Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

Zhao

Zheng

Liu

et al. 2020

steel research int.

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The damage of ladle refractory, which mainly occurs at the position of the slag line, results in an increasing need of maintenance and repair and can, in the worst case, lead to a breakout of melts causing potential risks for the personnel and damage of equipment. On the basis of this fact, the corrosion behavior of MgO–C refractory in contact with molten slag during the steel refining process is experimentally studied in this work. Rotating and static dipping tests of MgO–C refractory in CaO–SiO2–Al2O3–MgO–FeO slags are conducted, and the effects of composition of slag, carbon in refractory, and rotation speed on the corrosion behavior are investigated. Results show that the corrosion depth of the MgO–C refractory increases with FeO content of slag and rotation speed of MgO–C rod, whereas it decreases with an increase in slag basicity. Slag notably penetrates the surface layer of MgO–C refractory after the carbon is oxidized, causing an aggravation of the corrosion. Moreover, the corrosion mechanism of MgO–C refractory in molten slag during the refining process is studied and illustrated in this work.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

Zhao

Zheng

Liu

et al. 2020

steel research int.

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“…The porosity and pore size distribution were analyzed by using mercury porosimetry (AutoPore IV 9500, Micromeritics, Shanghai, China). The bulk density was measured by the Archimedes method in water medium, as shown in Equation (1) [14]. Three independently measured density values are average out and reported as the density of the sintered sample:Db=m1DLm3−m2 where D b refers to the bulk density, D L represents the density of water, m 1 corresponds to the mass of the sample dried in air, m 2 denotes the mass of the sample in water and m 3 refers to the mass of the sample with free bubbles on the surface.…”

Section: Methodsmentioning

confidence: 99%

Effects of the Molding Method and Blank Size of Green Body on the Sintering Densification of Magnesia

Jin

Wen

et al. 2019

Materials

Self Cite

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The bulk density of sintered magnesia is significantly influenced by molding methodology and blank size of the green body during dry pressing. The entrapped air in the green body plays a critical role in determining the bulk density of magnesia samples. Herein, high-density magnesia samples, with different sizes, are prepared by using vacuum compaction molding and conventional compaction molding. The physical properties, such as bulk density and pore size distribution, and morphology or as-sintered magnesia samples were characterized by using Archimedes method, mercury porosimetry, and scanning electron microscopy (SEM). The results indicate that the bulk density of conventional compaction magnesia samples decreased below 3.40 g·cm−3 with the increase of thickness due to the presence of entrapped-air induced large pores and intergranular cracks. In addition, the large pores and intergranular cracks in conventionally-compacted samples are observed by SEM images. However, vacuum compaction of magnesia samples resulted in a bulk density of higher than 3.40 g·cm−3 for all thicknesses. Moreover, the defects in vacuum-compacted magnesia samples are mainly in the form of small circular pores.

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“…Carbon-containing refractories, which exhibit excellent thermal shock resistances and corrosion resistances because of the additional carbon, have been widely applied over the last few decades [1,2]. However, the high carbon contents (10–20 wt.%) in current commercialized carbon-containing refractories leads to serious complications, such as inferior oxidation resistance, high thermal conductivity, high carbon pick-up in molten steel, and corresponding degradation of the mechanical properties of the products [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Micro-Nano Carbon Structures with Platelet, Glassy and Tube-Like Morphologies

et al. 2019

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Carbon source precursors for high-grade, clean, and low-carbon refractories were obtained by in situ exfoliation of flake graphite (FG) and phenol–formaldehyde resin (PF) composites with three-roll milling (TRM) for the fabrication of graphite nanoplatelets. In addition, by using Ni(NO3)2·6H2O as a catalyst in the pyrolysis process, multidimensional carbon nanostructures were obtained with coexisting graphite nanoplatelets (GNPs), glassy carbon (GC), and carbon nanotubes (CNTs). The resulting GNPs (exfoliated 16 times) had sizes of 10–30 μm, thicknesses of 30–50 nm, and could be uniformly dispersed in GC from the PF pyrolysis. Moreover, Ni(NO3)2·6H2O played a key role in the formation and growth of CNTs from a catalytic pyrolysis of partial PF with the V–S/tip growth mechanisms. The resulting multidimensional carbon nanostructures with GNPs/GC/CNTs are attributed to the shear force of the TRM process, pyrolysis, and catalytic action of nitrates. This method reduced the production costs of carbon source precursors for low-carbon refractories, and the precursors exhibited excellent performances when fabricated on large scales.

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Oxidation Resistance and Wetting Behavior of MgO-C Refractories: Effect of Carbon Content

Cited by 41 publications

References 26 publications

Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

Effects of the Molding Method and Blank Size of Green Body on the Sintering Densification of Magnesia

Micro-Nano Carbon Structures with Platelet, Glassy and Tube-Like Morphologies

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