Authors: Abbas Ramezani Mohammad Masoud Mohebi Alireza Souri
Publish Date: 2012/10/04
Volume: 22, Issue: 4, Pages: 1010-1017
Abstract
In this study four types of castables as calciumaluminate cement CACbonded and nanosilica NSbonded castables based on tabularalumina and bauxite aggregates were prepared to investigate the replacement of the calciumaluminate cement by NS All samples were allowed to dry at 110 °C then fired at 800 and 1200 °C Bulk density and apparent porosity of samples were measured The molten aluminum static corrosion test cup test results showed that NSbonded specimens had higher resistance to corrosion compared to CACbonded samples based on the measured average aluminum penetration depth into the refractory texture However no penetration was observed in bauxite NSbonded samples The results were consistent with dynamic corrosion test in aluminum melt carried out at 800 °C for 100 h The small pore size in NSbonded castables was found to be the main cause for high corrosion resistance as micropores prevented the melt to penetrate into the refractory
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