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Microsilica
Microsilica can have a significant impact on the refractory industry when used as an additive in refractories. It contributes to improved strength and durability, reduced permeability, increased resistance to thermal shock, heightened refractoriness, improved corrosion resistance, and reduced thermal conductivity.
Improved strength and durability
Microsilica, due to its pozzolanic properties, reacts with calcium hydroxide when added to refractories, forming additional calcium silicate hydrate gel (C-S-H). This reaction enhances the strength and durability of refractories, making them more resistant to heat and mechanical stress.
Increasing resistance to thermal shock
Incorporating Microsilica into refractory compounds enhances their resistance to thermal shock. Fine Microsilica particles promote a more uniform microstructure and reduce thermal gradients, thereby lowering the risk of cracking and peeling due to rapid temperature changes.
Improving corrosion resistance
Microsilica enhances the corrosion resistance of refractory materials, particularly in acidic and alkaline environments. It reduces the reaction with corrosive agents by forming a protective layer on the refractory surface, thus prolonging the lifespan of the refractory coating.
Reduction of permeability
Microsilica aids in compacting refractory materials by filling empty spaces and reducing porosity. This results in improved impermeability, minimizing the penetration of molten metals, slags, and gases into the refractory coating and extending its useful life.
Increased Refractoriness
Microsilica’s high melting point raises the refractories’ coefficient of refractoriness, enabling them to withstand higher operating temperatures without significant deformation or loss of structural integrity.
Reduction of thermal conductivity
Addition of Microsilica to refractory materials reduces their thermal conductivity. This property helps minimize heat loss and enhance energy efficiency in high-temperature applications.
