Significant improvement of refractoriness of Al2O3–C castables containing calcium aluminate nano-coatings on graphite

Nanostructured cementitious sol gel coating on graphite for application in monolithic refractory composites

This work examines the effect of exfoliated graphite (Exf-G) addition on mechanical, thermal, and non-flammability properties of polystyrene, nitro-polystyrene (PS-NO2), and amino-polystyrene (PS-NH2) by solution and melt processing. Exfoliated graphite yielded unique morphology in solution formed PS-NH2/Exf-G composites. Tensile strength of solution PS-NH2/Exf-G (30.1–53.2 MPa) was enhanced compared with melt route. Addition of Exf-G also improved T10 of solution processed PS-NH2/F-G 0.01–0.5 composites as 455–502°C. Cone calorimetry results showed that PS-NH2/Exf-G 0.5 formed by solution route had lower peak heat release rate (PHRR) value (434 kW/m2). Physical properties of solution caste systems were enhanced relative to melt systems depicting advantage of technique used.

Influence of Processing Technique on the Physical Properties of Modified Polystyrene/Exfoliated Graphite Nanocomposites

Comparison of solid state and sol–gel derived calcium aluminate coated graphite and characterization of prepared refractory composite

In depth studies on cementitious nanocoatings on graphite for its contribution in corrosion resistance of alumina based refractory composite

The performance of high alumina castables containing mullite and spinel coated graphites was investigated to explore their commercial application in carbon containing refractory composites. It was compared in terms of thermal shock resistance, refractoriness under load, static slag resistance test, pore size distribution, and physical properties, e.g., apparent porosity and cold crushing strength. The microstructures of these two castables, along with the other containing uncoated graphites, were also studied. Differential thermal analysis and X-ray diffraction patterns of heat-treated carbon-containing castable composites have also been noted. Castables containing mullite-coated graphite were found to be more resistant to repeated thermal shock cycles, whereas those containing spinel-coated graphites were more encouraging when slag resistance and overall physical properties are concerned.

S. Sengupta

Papers

Characteristics of Refractory Castables Containing Mullite and Spinel Coated Graphites