Abstract
Different mixtures of Moroccan silica-alumina geomaterials were used for the preparation of refractory ceramics. A formula of composition (M2) has allowed obtaining a good quality of refractory. Addition of a small quantity of carbon (1%) to the M2 formula has substantially improved the quality of the refractory. The morphological, textural and mineralogical evolution, through SEM and XRD shows that the addition of carbon, which plays a catalytic role, favors the crystallization of andalusite. Then, from 1200°C, the andalusite starts to transform to primary mullite needles. At 1400°C, the mullite becomes the major mineral phase beside cristobalite and vitreous phase.
Highlights
Many research studies have been conducted, until now, on mullite (3Al2O3-2SiO2) as a mineral phase with many properties: low thermal expansion and conductivity, excellent creep resistance, high temperature strength, and good chemical stability [1]
Mullite synthesized from silica-alumina geomaterials by heat treatment corresponds to a fundamental constituent of refractory ceramics [16,17,18]
The presentation of the data and their interpretation will be presented in two stages: first those of briquettes from mixtures without carbon (M1, M2, M3 and M4), those of briquettes with carbon (M2C0.5, M2C1 and M2C2)
Summary
Many research studies have been conducted, until now, on mullite (3Al2O3-2SiO2) as a mineral phase with many properties: low thermal expansion and conductivity, excellent creep resistance, high temperature strength, and good chemical stability [1]. The analysis of textures, mineral compositions and technological properties of obtained refractories allows defining the role of each of the geomaterials and the effect of carbon on the kinetics reaction of andalusite crystallization. This will permit, conesquently, to better control the synthesis of mullite. Effect of Carbon Graphite on the Crystallization of Andalusite: Application to the Synthesis of Mullite and the Improvement of Refractory Quality fractories
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