Incorporating Nano-silica as a Binder to Improve Corrosion Resistance of High Alumina Refractory Castables |
| |
Authors: | Abbas Ramezani Mohammad Masoud Mohebi Alireza Souri |
| |
Affiliation: | 1. Department of Materials, Imam Khomeini International University, Qazvin, Iran 2. Department of Materials, Malayer University, Malayer, Iran
|
| |
Abstract: | In this study, four types of castables as calcium-aluminate cement (CAC)-bonded and nano-silica (NS)-bonded castables based on tabular-alumina and bauxite aggregates were prepared to investigate the replacement of the calcium-aluminate 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 NS-bonded specimens had higher resistance to corrosion compared to CAC-bonded samples (based on the measured average aluminum penetration depth into the refractory texture). However no penetration was observed in bauxite NS-bonded 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 NS-bonded castables was found to be the main cause for high corrosion resistance as micro-pores prevented the melt to penetrate into the refractory. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|