Effect of the reactivity and porous structure of expanded graphite (EG) on microstructure and properties of Al2O3–C refractories

Wang, Qinghu; Li, Yawei; Sang, Shaobai; Jin, Shengli

doi:10.1016/j.jallcom.2015.05.124

Cited by 38 publications

(22 citation statements)

References 37 publications

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“…It further reacts with fine alumina particles present in the system to form aluminum borate . At 660°C, Al metal powder starts melting; when the temperature increases to 1000°C, it reacts with the surrounding carbon to form aluminum carbide . The formation of aluminum carbide enhances mechanical properties.…”

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%

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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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Section: Resultsmentioning

confidence: 99%

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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“…[18][19][20][21][22] One of the best-known methods to increase the strength of the matrix of Al 2 O 3 -C refractories is the in situ formation of SiC whiskers by adding metallic Si powder. [23][24][25][26][27] For example, Al 2 O 3 -C refractories containing ultrafine microcrystalline graphite fostered the formation of intertwined SiC whiskers, which caused a significantly higher strength. 23 Moreover, highly-reactive expanded graphite promoted indeed the formation of SiC whiskers with high aspect ratio in the matrix and a higher strength was obtained.…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical properties of lightweight Al₂O₃‐C refractories reinforced by combined one‐dimensional ceramic phases

Chen

Yan

Schafföner

et al. 2021

Int J Applied Ceramic Tech

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We prepared a new lightweight Al2O3‐C refractory material with a higher strength by using microporous corundum aggregates instead of dense tabular corundum aggregates, which was reinforced by in situ formed SiC whiskers, multi‐walled carbon nanotubes (MWCNTs), and mullite rods. A comparative study of the microstructure, mechanical properties, and fracture behavior was carried out for dense and lightweight Al2O3‐C refractories coked at 1200°C and 1400°C, respectively. By using the microporous corundum aggregates, a better aggregate/matrix interface bonding and an optimized distribution of SiC whiskers were obtained. The SiC whiskers formed inside the microporous corundum aggregates and simultaneously in the matrix by a vapor‐solid reaction mechanism, resulting in an enhancement at the microporous aggregate/matrix interface. Furthermore, the in situ formed MWCNTs and well‐developed mullite rods at 1200°C in the matrix also contributed to the better interface structure. Thus, due to the improved microporous aggregate/matrix interface, the crack propagation along the aggregate/matrix interface was suppressed, resulting in an increased crack propagation within the aggregates. Consequently, the synergy between microporous corundum aggregates and combined one‐dimensional ceramic phases caused a lower bulk density but a markedly higher strength, a higher fracture energy, and a higher toughness of lightweight Al2O3‐C refractories compared to the dense ones. Overall, our study allows to overcome the traditional concept that a higher strength of refractories is reached by a higher density.

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“…In addition, the poor dye adsorption in 1-D TiO 2 nanostructures could be addressed by modifications of the photoanode with graphene-based materials. Some researcher had done a systematic study with incorporation of graphene sheets (GS) in TiO 2 NPs, and observed that the PCE of the GS-TiO 2 was five times higher than that of the TiO 2 NPs alone (Wang et al 2015). The enhanced performance was due to better dye loading in the GS-TiO 2 composite film than that of the bare TiO 2 film.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneously, Ag nanoparticles could act as an efficient electron acceptor when combined with TiO 2 owing to the well-known metal-semiconductor heterojunction, which would restrain charge recombination so as to improve the interfacial charge transfer in the DSSCs (Singh et al 2019). However, less publication about the applicability of Ag nanoparticle adhere on RGO-Pt is reported (Wang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ag nanoparticles adhered on RGO based on both electrodes in dye-sensitized solar cells (DSSCs)

Pattarith

Areerob

2020

Renewables

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The electrode plays an important role in dye-sensitized solar cells (DSSCs). Preparation of the electrode should be simple and should result in high performance of its DSSC. We herein demonstrated high-performance and easily prepared Silver nanoparticles adhered on Reduced graphene oxide-Platinum composites (Ag-RGO/Pt) as counter electrodes (CEs) and TiO 2 on RGO sheets with Ag (TiO 2-RGO/Ag) as photoanode (PE) in DSSCs. The 1:2 Ag-RGO/Pt CE and 0.5% TiO 2-RGO/Ag PE showed an overall highest power conversion efficiency of 9.15% under (1.5 AM) solar irradiation. The optimal weight ratio of Ag:RGO:Pt materials was also examined. Moreover, we showed that incorporation of Ag nanoparticles into the counter electrode successfully improved interfacial charge transfer resulting in high electrocatalytic activity for the reduction of triiodide to iodide redox, which in turn could enhance the performance of the DSSCs.

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Effect of the reactivity and porous structure of expanded graphite (EG) on microstructure and properties of Al2O3–C refractories

Cited by 38 publications

References 37 publications

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

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

Enhanced mechanical properties of lightweight Al₂O₃‐C refractories reinforced by combined one‐dimensional ceramic phases

Fabrication of Ag nanoparticles adhered on RGO based on both electrodes in dye-sensitized solar cells (DSSCs)

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Effect of the reactivity and porous structure of expanded graphite (EG) on microstructure and properties of Al2O3–C refractories

Cited by 38 publications

References 37 publications

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

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

Enhanced mechanical properties of lightweight Al2O3‐C refractories reinforced by combined one‐dimensional ceramic phases

Fabrication of Ag nanoparticles adhered on RGO based on both electrodes in dye-sensitized solar cells (DSSCs)

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Product

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

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

Enhanced mechanical properties of lightweight Al₂O₃‐C refractories reinforced by combined one‐dimensional ceramic phases