Aggregate Effects on the Thermal Shock Resistance of Spinel-Forming Refractory Castables

M.A.L. Braulio1, G.B. Cintra1, V.C. Pandofelli1, Y.W. Li2

1 Federal University of São Carlos, Materials Engineering Department, Materials Microstructural Engineering Group, 13565-905 São Carlos, SP, Brazil
2 College of Materials & Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, China


Volume 2, Issue 3, Pages 102 - 106


The performance of spinel forming refractory castables is mainly related to their slag corrosion and thermal shock behaviors. Concerning the thermal shock resistance, the aggregate selection is an important issue, as it can reduce the crack propagation and refractory damage. Therefore, this work addresses the effect of different aggregate sources (tabular alumina, electro-fused or sintered pre-formed spinels and electro-fused magnesia) in calcium aluminate cement (CAC)-bonded refractory castables. The calcium hexaluminate (CA6) formation and its distribution throughout the castable microstructure played an outstanding role in the thermal shock resistance, pointing out the need for an appropriate microstructural design in order to attain a suitable performance during the castable application.


thermal shock resistance, calcium hexaluminate (CA6), spinel-forming castables



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