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Mechanical evaluation at high temperatures of hot gunning refractory mixtures

Published online by Cambridge University Press:  31 January 2011

G.I. Gasillón ,
A.G.Tomba Martinez ,
A.L. Cavalieri ,
M. de Córdova  and
R. Topolevsky
G.I. Gasillón
Affiliation:
Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Av. J.B. Justo 4302 (7600) Mar del Plata, Argentina
A.G.Tomba Martinez
Affiliation:
Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Av. J.B. Justo 4302 (7600) Mar del Plata, Argentina
A.L. Cavalieri
Affiliation:
Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Av. J.B. Justo 4302 (7600) Mar del Plata, Argentina
M. de Córdova
Affiliation:
Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Av. J.B. Justo 4302 (7600) Mar del Plata, Argentina
R. Topolevsky
Affiliation:
Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Av. J.B. Justo 4302 (7600) Mar del Plata, Argentina
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Abstract

The mechanical behavior at high temperatures of three hot gunning refractory mixtures used for coke oven repair was studied. The materials were characterized by chemical, mineralogical, granulometric, and microscopic analyses, exhibiting differences in composition and particle size distributions of both aggregates and bonding phases. The hot adhesion of the mixtures to silica bricks was determined using torsional forces, and the interphase between them was analyzed by scanning electron microscopy. Thermal expansion up to 1200 °C and creep under compressive load (172 kPa at 1200 °C, 3 h) were carried out on prisms prepared by ramming and sintering (1200 °C, 1 h). The creep strain–time data are well fitted using constitutive equations. The mixtures showed differences in both hot adhesion and thermal expansion–creep tests: the material based on calcium aluminates exhibited poorer properties than those based on calcium silicate. The results are explainded taking into consideration the characteristics of both aggregates and bonding phases.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 2 , February 2003 , pp. 524 - 530
Copyright
Copyright © Materials Research Society 2003

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References

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