Oxidation behaviors of MgO-C refractories with different Si/SiC ratio in the 1100–1500 °C range

Xiao, Junli; Chen, Junfeng; Wei, Yaowu; Zhang, Yu; Zhang, Shaowei; Li, Nan

doi:10.1016/j.ceramint.2019.07.086

Cited by 53 publications

(22 citation statements)

References 43 publications

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“…Based on the above discussion, the formation process of isolation belt and liquid‐phase isolation layer on the corroded interface were discussed, the role of SiC‐additive were elucidated as following: considering the reducing atmosphere in MgO‐C brick under high‐temperature, Mg(g) vapor (including some slight Mg‐containing vapors) generated inside the bricks via to Reaction () and trended to migrate to the bricks’ surface (hot‐face). As a result, a thin MgO layer maybe formed on refractory' surface by the re‐oxidation of Mg(g) by oxygen during refining process 43,44

SiC (s) + CO (g) = SiO (g) + 2 C (s),

SiO false(normalg false) + 2 CO false(normalg false) = {SiO}_{2} false(normalg false) + C false(normals false) .

…”

Section: Discussionmentioning

confidence: 99%

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al₂O₃‐SiC‐C refractory and molten steel: Role of SiC

Chen

Xiao

et al. 2021

J. Am. Ceram. Soc.

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Formation of a dense layer on corroded interface to suppress corrosion is always desired, but it is controlled by numerous environmental conditions. In this work, corroded microstructures of MgO/Al2O3‐SiC‐C refractories in metal bath area of ladle furnace were investigated after industrial trails. A liquid‐phase isolation layer in which MgO islands and liquid phases was established on the corroded interface of refractories with 6 wt% coarse/fine SiC‐additive. The formed isolation layer against steel/slag attacks led to an approximate 30% improvement in corrosion resistance than that of refractory with 3 wt% fine SiC‐additive. More importantly, the liquid‐phase isolation layer blocked the direct mass transfer between molten steel and refractories while it decreased exogenous pollution from refractories. SiC‐additive affected the formation process of isolation layer by controlling the generation/migration of Mg(g) on refractory' surface. A further formation mechanism of liquid‐phase isolation layer was discussed in detail and role of SiC was elucidated.

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SiC (s) + CO (g) = SiO (g) + 2 C (s),

SiO false(normalg false) + 2 CO false(normalg false) = {SiO}_{2} false(normalg false) + C false(normals false) .

…”

Section: Discussionmentioning

confidence: 99%

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al₂O₃‐SiC‐C refractory and molten steel: Role of SiC

Chen

Xiao

et al. 2021

J. Am. Ceram. Soc.

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“…Carbon-oxide composites are a further development in stainless steel making and have and have contributed significantly towards a dramatic reduction in refractory consumption. However, carbon-oxide refractories suffer two main drawbacks (Chen et al, 2018;Liao et al, 2018;Xiao et al, 2019): ➤ Molten metal like steel can pick up carbon from carboncontaining refractories. This increases the carbon content in the metal, which is not desirable for high-quality steel.…”

Section: Non-basic Carbon-containing Refractory Materialsmentioning

confidence: 99%

“…Additives and alternative carbon sources are being investigated to attain the same refractoriness in the oxide-carbon materials with a reduced carbon content. The following additives are potential sources of carbon: Ti 3 AlC 2 (Chen et al, 2018), Al 4 SiC 4 (Yao et al, 2017), expanded graphite/SiC or SiO x hybrids, activated carbon, carbon black, carbon fibres, nanocarbon, graphene, graphene oxide nanosheets, and expanded graphite (Wang et al, 2018;Xiao et al, 2019).…”

Section: Non-basic Carbon-containing Refractory Materialsmentioning

confidence: 99%

A review of carbon-based refractory materials and their applications

Thethwayo

Steenkamp

2020

J. S. Afr. Inst. Min. Metall.

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SYNOPSIS Although carbon is typically considered a reductant in pyrometallurgical smelting processes, it can also be applied as refractory material in the furnace containment system. The paper introduces researchers, new to the field, to refractory materials and the role they play in the design of the furnace containment system. It also provides an overview of carbon-containing and carbon-based refractory materials and their respective applications, including the refractory lining of the furnace containment system. The industries discussed include iron and steel making, ferro-alloys (silicomanganese), and platinum group metals. Keywords: refractories, carbon-containing, carbon-based, graphite, carbon.

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“…Sin embargo, es posible confirmar que se ha producido una transformación de fases a partir de la formación de espinela (Al2MgO4) y forsterita (Mg2SiO4) en dichas muestras. La formación de dichas fases es deseable no solo para mejorar la resistencia a la oxidación del carbono, sino también porque pueden aumentar la resistencia mecánica de los materiales refractarios (Xiao J. et al, 2019;Zhu T. et al, 2016).…”

Section: Muestraunclassified

“…Esto impacta en los costos de las plantas y es allí donde nace la necesidad de llevar a cabo una selección adecuada de los refractarios. El uso de ladrillos refractarios de MgO-C en la industria del acero se generalizó a principios de los años ochenta, dando lugar a la mejora del proceso metalúrgico, reduciendo drásticamente del consumo de refractario por tonelada de acero, al mismo tiempo, se garantizó la continuidad y estabilidad de los procesos de fusión (Xiao J. et al, 2019). La fabricación de acero se caracteriza por la continua demanda de aumentar la pureza y tener especificaciones de composición cada vez más estrictas, y que por esta razón requiere condiciones químicas, térmicas y mecánicas extremas, que exigen contar con materiales de alto desempeño.…”

Section: Introductionunclassified

Comportamiento termomecánico y termoquímico de ladrillos refractarios MgO-C

Lagorio

Benavídez²

2020

AJEA

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El desarrollo tecnológico de los ladrillos de MgO-C y su posición en el mercado, genera un gran interés en continuar estudiando ciertos temas que aún son de discusión. El desarrollo del tema de esta tesis es de utilidad, tanto para el sector académico como el industrial, en la generación de conocimiento integral de los refractarios MgO-C. El objetivo es estudiar el efecto que tiene la calidad de las materias primas en el comportamiento químico, mecánico y térmico de estos materiales. Para esto se formularon ladrillos con dos calidades de agregados de magnesia (electrofundidos y sinterizados) y con diferentes grados de pureza (entre 97,6 - 99,1% MgO). Los materiales para este estudio se prepararon a partir de 90% en peso de magnesia (MgO) y 8,2% en peso de grafito (C), que se completó con la adición de antioxidantes y resina ligante. Se determinaron: (i) composición química y mineralógica, (ii) análisis microestructural, (iii) densidad y porosidad (aparente y total), (iv) resistencia al ataque químico por escorias a 1600°C, (v) comportamiento mecánico en compresión a temperatura ambiente y a 1400 °C, y (vi) evolución térmica hasta 1400°C.

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Oxidation behaviors of MgO-C refractories with different Si/SiC ratio in the 1100–1500 °C range

Cited by 53 publications

References 43 publications

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al₂O₃‐SiC‐C refractory and molten steel: Role of SiC

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al₂O₃‐SiC‐C refractory and molten steel: Role of SiC

A review of carbon-based refractory materials and their applications

Comportamiento termomecánico y termoquímico de ladrillos refractarios MgO-C

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Oxidation behaviors of MgO-C refractories with different Si/SiC ratio in the 1100–1500 °C range

Cited by 53 publications

References 43 publications

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al2O3‐SiC‐C refractory and molten steel: Role of SiC

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al2O3‐SiC‐C refractory and molten steel: Role of SiC

A review of carbon-based refractory materials and their applications

Comportamiento termomecánico y termoquímico de ladrillos refractarios MgO-C

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Product

Resources

About

Oxidation behaviors of MgO-C refractories with different Si/SiC ratio in the 1100–1500 °C range

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al₂O₃‐SiC‐C refractory and molten steel: Role of SiC

Formation of liquid‐phase isolation layer on the corroded interface of MgO/Al₂O₃‐SiC‐C refractory and molten steel: Role of SiC