Key Properties :
Compressive strength: 15-20 N/mm² or up to 200-220 kg/cm².
Thermal shock resistance and chemical inertness prevent slag erosion.
Insulating qualities reduce heat loss.
Applications :
Common uses include blast furnaces, ovens, boilers, chimneys, and kilns in the cement, glass, and metal industries. They outperform regular bricks near intense heat sources like fireplaces or barbecues.
Refractory bricks are manufactured through a multi-step process involving raw material preparation, forming, drying, firing, and finishing to achieve high heat resistance. This ensures they can endure temperatures up to 1800°C in industrial applications.
Raw Materials :
High-alumina clays, silica, magnesia, or other minerals are selected for purity and crushed into various particle sizes, from coarse aggregates to fine powders. Binders like clay or resins and water are added during mixing to create a homogeneous, plastic batch with controlled moisture.
Forming :
The mixture is shaped using methods such as hydraulic pressing (for dense bricks), extrusion (for uniform shapes), or casting (for complex forms). This step determines the brick's density and porosity, with standard sizes around 9x4.5x2.5 inches.
Drying and Firing :
Green bricks are dried at 110-150°C to remove moisture and prevent cracks, then fired in kilns at 1300-1800°C. This high-temperature sintering develops the ceramic bond, enhancing strength and thermal stability through phase transformations.
Finishing:
Post-firing, bricks undergo inspection for defects, grinding for precise dimensions, and classification by properties like compressive strength. Qualified bricks are packaged for shipment to furnaces or kilns.
Description provided by indian stalwart global sourcing company.
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