Ceramics-Silikáty 54, (3) 284 - 289 (2010) |
|
IMPACT OF DISPERSANTS ON THE MECHANICAL STRENGTH
DEVELOPMENT OF ALUMINA-SPINEL SELF-FLOWING
REFRACTORY CASTABLES |
Otroj Sasan 1, Nilforushan Mohammad Reza 1, Daghidhi Arash 1,
Marzban Reza 2 |
1 Faculty of Engineering, Shahrekord University, Shahrekord, Iran
2 Niru Refractory Company, Tehran, Iran
|
Keywords: Dispersant, Mechanical strength, Alumina-spinel, Self- flow, Castable |
The effect of four commercial dispersants on the properties of alumina-spinel self-flowing refractory castables was
investigated. The self-flow value, water demand, physical and mechanical properties as well as microstructure of these
castables were evaluated. The results showed that the polycarboxylate ether is the most effective dispersant in increasing
self-flowability because of its electrosteric dispersion mechanism. By the use of proper amounts of polycarboxylate ether
and sodium hexametaphosphate, the alumina-spinel self-flowing refractory castables with high strength and adequate
working time were obtained. The microstructural evaluations showed that the CA₆ was formed inside the grain boundaries
of refractory castable after firing at 1500°C. |
PDF (1.5 MB) |
|