Abstract
The incorporation of carbon materials is known to significantly enhance both corrosion and thermal shock resistance of refractories. For mixing and placement of refractory castables, water is the most suitable liquid media due to its availability, cost, non-hazardous characteristics and ease of handling. The main factors limiting the development and use of carbon-containing castables are the inferior wettability of carbon by water. Dispersion of carbon-containing materials in water with and without addition of surfactant was tested. By varying the carbon source and keeping the quality and quantity of all other raw materials constant, zero cement castable (ZCC) compositions were designed. The samples were coked and physical properties, oxidation resistance, and pore sizes were measured and FESEM studies carried out. The properties of castables containing processed graphite (PG) and multi-walled carbon nanotubes (MWCNT) were found to be most favourable for the iron and steel industry.
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