The Improvements for the Siliceous Self-Flow Castable with Adding Nano SiO2

In order to make up for the deficiencies due to the molding process,and improve the mechanical properties and sintering performance of self-flow castable,in this paper, we used nano SiO2 which had high surface activity as admixture. We added 0wt%, 0.1wt%, 0.2wt%, 0.3wt% of nano SiO2, and then test the linear change, Flexural strength, compressive strength,and refractoriness under load after dried at 110°Cfor 24h and heat treatment at 1400°C for 8h.The results showed that: with the increase of nano SiO2, self-flow value of self-flow castablel decreased, the flexural strength and compressive strength of the sample increased after dried at 110°C for 24 h, the strength of the self-flow castable was improved after formed.After heat treatment at 1400°C for 8h, linear change of the sample remained the same, Tridymite content, flexural strength and compressive strength increased, apparent porosity decreased, refractoriness under load lowered.