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Mar del Plata, Argentina

Musante L.,Tenaris Siderca RandD Campana 2804 | Munoz V.,Laboratorio Of Materiales Estructurales | Labadie M.H.,Ternium | Tomba Martinez A.G.,Laboratorio Of Materiales Estructurales
Ceramics International | Year: 2011

The advantages of Al2O3-MgO-C (AMC) refractories are achieved mainly by the incorporation of graphite and the formation of spinel by solid reaction between alumina and magnesia. Regarding other members of oxide-C refractories (such as MgO-C bricks) and others properties (such as the slag corrosion resistance or the PLC), the information about the mechanical behavior of this type of refractories is scarce. In this work, the mechanical behavior of commercial AMC brick used in steelmaking ladles was studied by stress-strain curves in compression at RT and 1000 °C (nitrogen atmosphere). Before the mechanical testing, a comprehensive characterization of AMC materials was performed by several techniques: XRD, DTA/TGA, SEM/EDS, aggregate size distribution analysis and densities, porosities and thermal expansion measurements. Mechanical parameters such as fracture strength and strain, yield stress and Young modulus were determined together with the main characteristics of the fracture. In order to study the transformations occurred during the stay at high temperature, the specimens tested at 1000 °C were analyzed by the same techniques used for the as-received bricks characterization (with the exception of the thermal expansion analysis). The AMC refractories displayed differences in the mechanical behavior and its dependence on the testing temperature. These results were explained considering the differences in the composition and microstructure of both refractories and in their thermal transformations. © 2011 Elsevier Ltd and Techna Group S.r.l. Source

Sandoval M.L.,Laboratorio Of Materiales Estructurales | Talou M.H.,Laboratorio Of Materiales Estructurales | De Souto P.M.,Federal University of Sao Carlos | Kiminami R.H.G.A.,Federal University of Sao Carlos | Camerucci M.A.,Laboratorio Of Materiales Estructurales
Ceramics International | Year: 2011

This paper reports on a study of the microwave sintering behavior of green disks prepared by the starch consolidation forming method to produce cordierite-based porous materials. Green disks were formed by thermogelling the aqueous suspensions of talc, kaolin and alumina (29.6 vol.%) and potato starch (11.5 vol.%) at 75 and 85 °C for 4 h, drying and calcining. They were characterized by bulk density and apparent porosity measurements, and SEM. Microwave sintering was carried out at 1300 and 1330 °C for 15, 20 and 25 min, applying 50 °C/min. For purposes of comparison, an analysis of green disks prepared and calcined in the same conditions and conventionally sintered (1330 °C for 4 h) was also made. The materials were characterized by XRD, bulk density and apparent porosity measurements, and microstructurally analyzed SEM. The results were analyzed considering the behavior of starch in aqueous suspension at varying temperatures, and the experimental conditions of consolidation and sintering. © 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved. All rights reserved. Source

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