High temperature mechanical behavior of Al2O3–MgO–C refractories for steelmaking use

Musante, Leonardo; Muñoz, Vanesa; Labadie, Marcelo H.; Martínez, A.G. Tomba

doi:10.1016/j.ceramint.2010.12.019

Cited by 32 publications

(19 citation statements)

References 9 publications

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“…Although of local character, the generation of chemical bonds between the different components of the refractory and the C-network increased the mechanical strength of the structure, mainly during the bonding phase, when the failure commonly begins. Nevertheless, the values of σ R remained inferior to those at room temperature, in contrast to what was found in other AMC refractories of similar composition [19], which exhibited mechanical strength comparable or even higher at 1000 1C than at RT.…”

Section: Discussioncontrasting

confidence: 77%

“…In AMC1 and AMC3, these conflicting factors (growth of porosity, on one side, and graphite loss and new solid phase formation on the other) could offset each other, leading to the constancy of E parameter. In each case, the apparent Young's modulus at 1000 1C turned out to be lower than the value at RT, conversely to what is reported for AMC refractories of similar composition [19], whose values at 1000 1C were of the same order or notably higher than those at room temperature.…”

Section: Discussionsupporting

confidence: 42%

“…Several of the aspects analyzed and reported for MgO-C also apply to Al 2 O 3 -MgO-C (AMC) refractories, for which there are not as many reports or such a deep level of analysis [19]. The mechanical degradation of AMC refractories, strongly depends on the range of temperature and the gases composing the atmosphere, very similar to what happens with MgO-C bricks.…”

Section: Introductionmentioning

confidence: 92%

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Thermomechanical behaviour of Al2O3–MgO–C refractories under non-oxidizing atmosphere

Muñoz

Martínez

2015

Ceramics International

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Section: Discussioncontrasting

confidence: 77%

Section: Discussionsupporting

confidence: 42%

Section: Introductionmentioning

confidence: 92%

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Thermomechanical behaviour of Al2O3–MgO–C refractories under non-oxidizing atmosphere

Muñoz

Martínez

2015

Ceramics International

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“…Los valores de los parámetros se reportan en la Tabla 1. A temperatura ambiente, la resistencia y deformación a la fractura y el módulo elástico del refractario AMC resultan del orden de los encontrados en la literatura para materiales de composiciones similares [10,12,33,34]. A 1260 °C en aire, la disminución de σ R y E y el aumento de la deformación de rotura se relacionan principalmente con los cambios que ocurren en atmósfera oxidante en los componentes carbonosos de la fase ligante (resina y grafito), con el aumento significativo de la porosidad aparente.…”

Section: Curvas Esfuerzo-deformación Y Parámetros Mecánicosunclassified

Aspectos experimentales de la determinacion de curvas esfuerzo-deformacion a alta temperatura y en atmosfera controlada: Refractarios Al<sub>2</sub>O<sub>3</sub>-MgO-C

Muñoz¹,

Rohr²,

Martínez³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

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Se presenta una metodología diseñada e implementada en el Laboratorio de Materiales Estructurales de la División Cerámicos del INTEMA para la evaluación del comportamiento mecánico de materiales refractarios a altas temperaturas y en atmósfera controlada. La metodología comprende la determinación de la deformación por extensometría de contacto en ensayos en compresión con el fin de obtener curvas esfuerzo-deformación y el uso de un sistema de control de atmósfera por desplazamiento a través del pasaje de una corriente gaseosa. La determinación de curvas esfuerzo-deformación de ladrillos refractarios comerciales Al 2 O 3 -MgO-C utilizados en cucharas de acería a temperatura ambiente y a 1260 °C en diferentes atmósferas se presenta como ejemplo de aplicación de esta metodología. Palabras clave: curvas esfuerzo-deformación, alta temperatura, atmósfera controlada, refractarios óxido-CExperimental aspects of stress-strain curves determination at high temperature and controlled atmosphere: Al 2 O 3 -MgO-C refractories A methodology for the mechanical evaluation of refractory materials at high temperatures and controlled atmosphere, designed and implemented in the Structural Materials Laboratory of Ceramics Division of INTEMA, is described. The methodology includes the measurement of the specimen deformation by contact extensometry in compression tests to obtain stress-strain curves and the use of a gaseous flow as a system to control atmosphere. The determination of stress-strain curves of Al 2 O 3 -MgO-C commercial refractories used in steelmaking ladles at room temperature and 1260°C in different atmospheres is presented as an example of application of this methodology.Keywords: stress-strain curves, high temperature, controlled atmosphere, oxide-C refractories INTRODUCCIONLas propiedades mecánicas superiores de los refractarios óxido-C [1, 2] están relacionadas con la deformación inelástica (o flexibilidad) otorgada por la presencia de grafito [3]. Este comportamiento le permite al ladrillo acomodar el esfuerzo aplicado mediante cierta 'fluencia', incrementando la deformación de fractura. Desde este punto de vista, además del esfuerzo a la fractura, comúnmente usado como propiedad para evaluar mecánicamente este tipo de materiales [1,4] (módulo de rotura MOR, resistencia a la compresión CCS, módulo de rotura en caliente HMOR), la deformación en esta condición es un dato igualmente importante. Las curvas esfuerzo-deformación son una fuente adecuada para acceder a esta información y pueden ser obtenidas en diferentes condiciones de temperatura y atmósfera [5][6][7][8][9][10][11]. Además, a partir de esas curvas pueden calcularse parámetros mecánicos indispensables para la obtención de ecuaciones constitutivas requeridas en la actualidad para alimentar los programas de elementos finitos empleados en el cálculo estructural. Junto con el análisis de los mecanismos de deformación y fractura, Vol 50, 3, 125-134, Mayo-Junio 2011 ISSN 0366-3175. eISSN 2173-0431. doi: 10.3989/cyv.172011 las relaciones esfuerzo-deformación so...

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“…Al 2 O 3 -C refractories have been extensively used as functional and high-duty materials (such as slide gates, submerged entry nozzles and monoblock stoppers) in continuous casting process of steel-making plant due to their excellent thermal, mechanical and chemical properties [1][2][3]. Generally, Al 2 O 3 -C refractories contain 5-30 wt% carbon which was depending on specific products mentioned above.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Sang

et al. 2015

Journal of Alloys and Compounds

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High temperature mechanical behavior of Al2O3–MgO–C refractories for steelmaking use

Cited by 32 publications

References 9 publications

Thermomechanical behaviour of Al2O3–MgO–C refractories under non-oxidizing atmosphere

Thermomechanical behaviour of Al2O3–MgO–C refractories under non-oxidizing atmosphere

Aspectos experimentales de la determinacion de curvas esfuerzo-deformacion a alta temperatura y en atmosfera controlada: Refractarios Al<sub>2</sub>O<sub>3</sub>-MgO-C

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

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