Nanocarbon containing Al2O3 – C continuous casting refractories: Effect of graphite content

Pilli, Venkatesh; Sarkar, Ritwik

doi:10.1016/j.jallcom.2017.11.324

Cited by 22 publications

(23 citation statements)

References 16 publications

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“…The CCS failure of the fired MgO-C refractories, especially in higher carbon content, was due to the abundant pores that were generated by the carbon oxidation, which made the composition weak and fragile. The changed trends of CCS were in agreement with those reported [12] by other researchers. …”

Section: Resultssupporting

confidence: 93%

“…However, carbon is susceptible to oxidation [10], particularly in high temperatures, which is classified into direct (Equation (1)) and indirect oxidation (Equation (2)). Numerous studies have shown that many factors, such as porosity [11], reactivity of the graphite [12], gas composition, and flow characteristics [13], could dramatically affect the direct oxidation rate of the refractory. Also, the oxidation kinetics of the MgO-C refractory was studied with respect to different firing temperatures and holding times.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Yang

et al. 2018

Materials

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Various carbon contents in the MgO-C refractory were studied with respect to the oxidation resistance and the wetting behavior with slag. The bulk density, apparent porosity, cold crushing strength, oxidation rate, and mass loss rate of the fired MgO-C refractories with various carbon contents were measured and compared. The wetting and penetration behavior of the cured MgO-C refractory with the molten slag were observed in-situ. The contact angle and the shape parameters of molten slag, including the apparent radius, height, and volume were compared. The results showed that the regenerated MgO effectively restrained the carbon oxidation in the MgO-C refractory, which was more evident at the low carbon content refractory. The contact angle between the MgO-C refractory and the molten slag increased as the carbon content increased. The increased contact angle decreased the penetration of the molten slag.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

Liu

Yang

et al. 2018

Materials

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“…In all the cases, strength values increase with the increase in temperature up to 1000°C and then decrease, which is due to the aluminum carbide formation and dissociation. The reduction of strength after 1400oC is due to the complete disintegration of aluminum carbide . The density and strength values are low in the case of M1 and M2 compared to M3 due to the poor distribution of nanocarbon in the batch composition.…”

Section: Resultsmentioning

confidence: 99%

“…The refractories used in the steel casting operations are generally made up of alumina‐carbon system, especially in the flow control devices like slide gate plates, submerged entry nozzles, monoblock stopper rods, and ladle shrouds, because of their excellent thermal and mechanical properties . Alumina is the major constituent in this class of refractories, which is necessary to provide mechanical and thermomechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of mixing on the properties of nanocarbon containing Al₂O₃‐C continuous casting refractories

Pilli

Sarkar

2019

Int J Applied Ceramic Tech

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The functional refractories used in steel casting operations are usually made up of alumina‐carbon compositions having graphite as the major source of carbon. In recent times, to reduce the carbon content and to enhance the performance by designing microstructure at nano‐sized level, several nano carbon sources and organic binders are introduced to traditional carbon‐based refractories. The homogenous distribution of nano carbon sources within the refractory composition is important to get the advantages of its use. In the present work, nanocarbon black is used along with graphite in the alumina‐carbon system. Three different mixing procedures are followed and how mixing effects the physical and mechanical properties is evaluated. The mixing order with proper nanocarbon distribution throughout the batch composition provided significant improvement in the properties. The microstructural analysis and in situ phase developments in the samples at different temperatures are also studied.

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“…Refractory materials are designed to remain physically and chemically stable under high-temperature conditions and are used for the linings of furnaces [ 1 ], kilns, ladles [ 2 ], reactors, converters, and other types of high-temperature vessels [ 3 , 4 ]. For instance, blast furnace hearths are lined with graphite, ramming material, ceramics, and carbon bricks [ 5 ] from the core to the periphery.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Measuring the Thickness of Refractory of Metallurgical Vessels

Han

et al. 2020

Materials

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The advancement of metallurgical vessels, such as blast furnaces, shaft furnaces, and torpedo ladles, can be better controlled and expanded for a greater lifespan if the thickness of the refractory lining wear is known and predicted. In the past, various methods including radioactive tracers, infrared (IR) thermography, electromagnetic waves, ultrasonic tomography, and temperature field have been tested to determine the thickness of the refractory wall. However, for various reasons, these methods have failed to be effective. This paper presents a novel method—electromotive force (EMF)—for predicting the thickness of refractory lining wear in vessels, including a small-scale vessel in the laboratory, an industrial torpedo ladle, and in the two refining hearths of blast furnaces. The experimental results show that the magnitude of the EMF signal increases with a decrease in wall thickness. Prediction values of the refractory wall thickness are consistent with measured ones. The relative error of EMF measurement for the torpedo ladle is around 6.8%. The EMF measurement of blast furnace hearths is quite accurate, and the relative error is less than 11%.

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Nanocarbon containing Al2O3 – C continuous casting refractories: Effect of graphite content

Cited by 22 publications

References 16 publications

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

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

Effect of mixing on the properties of nanocarbon containing Al₂O₃‐C continuous casting refractories

A Novel Approach for Measuring the Thickness of Refractory of Metallurgical Vessels

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Nanocarbon containing Al2O3 – C continuous casting refractories: Effect of graphite content

Cited by 22 publications

References 16 publications

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

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

Effect of mixing on the properties of nanocarbon containing Al2O3‐C continuous casting refractories

A Novel Approach for Measuring the Thickness of Refractory of Metallurgical Vessels

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Product

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Effect of mixing on the properties of nanocarbon containing Al₂O₃‐C continuous casting refractories