Why are refractory materials used to line industrial furnaces and kilns?

Refractory materials are essential for lining industrial furnaces and kilns because they possess an unusually high melting point and maintain their structural integrity at extreme temperatures.1

These materials are primarily composed of ceramics, which are chosen for their ability to withstand harsh processing environments through several key properties:

• Chemical Inertness: They resist corrosion when exposed to aggressive molten materials and gases, a critical requirement in the metallurgical and glassmaking industries.2
• Thermal Shock Resistance: By adjusting their microstructure, these materials can resist cracking when subjected to rapid temperature changes.2
• Physical Durability: They exhibit superior resistance to abrasion and wear, ensuring the longevity of the furnace lining.2

Depending on the specific industrial application, such as steelmaking, specialized refractories like magnesia or dolomite are used to provide outstanding resistance to specific chemical agents like iron oxides and basic slags.3