Refractory bricks, as core protective materials in high-temperature industrial environments, rely on their unique material composition and microstructure to become indispensable key components in high-temperature industrial fields such as metallurgy, building materials, and petrochemicals. Their core technical characteristics are mainly reflected in the following dimensions:
1.Excellent High-Temperature Resistance
Excellent high-temperature resistance is a fundamental technical indicator of refractory bricks. These materials are mainly composed of refractory raw materials. Such as alumina, magnesia, and silica, and are prepared through a high-temperature sintering process. Their refractoriness is generally not lower than 1580℃, and the maximum service temperature of some special refractory bricks can exceed 2000℃. When used on the inner walls of high-temperature equipment such as kilns and blast furnaces, they can form a stable high-temperature protective layer, effectively blocking heat transfer and protecting the equipment substrate from high-temperature damage.
2. Reliable High-Temperature Structural Strength
Reliable high-temperature structural strength ensures that they are not easily deformed during service. In industrial production conditions, refractory bricks must withstand continuous high temperatures, material loads, and equipment operating pressures. Their high-temperature compressive strength typically reaches tens of megapascals, effectively resisting mechanical compression and material erosion under high-temperature environments. Ensuring the structural integrity of equipment, and preventing production safety accidents caused by lining collapse.
3. Good Thermal Shock Resistance
Good thermal shock resistance is a key factor in extending their service life. Industrial kilns experience drastic temperature fluctuations during start-up, shutdown, and operational adjustments, requiring refractory bricks to withstand repeated cycles of thermal expansion and contraction. High-quality refractory bricks, through optimized raw material ratios and microstructure design, can achieve thermal shock resistance of tens to hundreds of cycles, significantly reducing the risk of lining cracking and spalling caused by sudden temperature changes.
4. Excellent Erosion Resistance
Furthermore, refractory bricks possess excellent erosion resistance, effectively resisting chemical erosion and physical erosion from molten metal, slag, and corrosive flue gases; simultaneously, their low thermal conductivity provides them with certain energy-saving and heat-insulating effects. These characteristics together establish the core application position of refractory bricks in high-temperature industrial fields. And are also an important technical basis for their classification according to different working conditions.