NON-CEMENT REFRACTORY CASTABLES CONTAINING NANO-SILICA: PERFORMANCE, MICROSTRUCTURE, PROPERTIES

The effect of nano-silica sol content on the self-flow characteristics, microstructure, physical and mechanical properties of high-alumina self-flowing non-cement castable was studied. The self-flow characteristics such as: self-flow value and working time were evaluated. The bulk density, apparent...

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Bibliographic Details
Published in:Ceramics (Praha) 2009-01, Vol.53 (4), p.297-302
Main Authors: Badiee, S H, Otroj, S
Format: Article
Language:English
Online Access:Get full text
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Summary:The effect of nano-silica sol content on the self-flow characteristics, microstructure, physical and mechanical properties of high-alumina self-flowing non-cement castable was studied. The self-flow characteristics such as: self-flow value and working time were evaluated. The bulk density, apparent porosity, mechanical properties and microstructure of fired castables at different temperatures were investigated. The proper nano-silica content for achieving self-flowing performance of such castables and sufficient strength was 10-11%. By increasing the firing temperature up to 1000 C, porosity and pore sizes of the castable tended to decrease because of complete dehydration of hydroxyl groups, which could lead to increase of strength. By using nanometre-sized colloidal silica particles with high surface area, solid phase sintering of the nano-sized particles and mullite formation could occur in temperatures up to 1300 C.
ISSN:0862-5468