Silica Fume Applications in Refactory and Ceramics

Refactory and Ceramics

The use of silica fume in refractory castables provides better particle packing. It allows for less water to be used while maintaining the same flow characteristics. It also promotes low temperature sintering and the formation of mullite in the matrix of the castable. This produces a castable that has a low permeability to avoid gas, slag and metal penetration. Castables incorporating silica fume are stronger than non-silica fume containing castables especially at high temperatures with higher density they attain lower porosity and are more volume stable.

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The microsilica is as a raw material, commonly used in the refractory industry. It plays an important role to improve monolithic refractories.

· Microsilica is filled in those gaps of which in the traditional refractories. Thus, it increases the bulk density and lowers the porosity, so that intensity can be increased abviously.

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· Microsilica contains strong activity to form colloidal particles in the water, and adding suitable dispersant to enhance liquidity, thereby improving performance casting.

· Microsilica is easy to form -Si-OH in the water and has strong hydrophilicity and activity. It can enhance the cohesion of refractories, in the meantime, it also improves greatly the high temperature properties and extends the life of refractory products.

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