Why do different refractory bricks have different refractory degrees?
Different refractory bricks have different refractory properties because different raw materials and different combustion temperatures produce different refractory properties.
In the production of refractory materials, due to the maturity of the production process and the realization of fire resistance, basically no fire resistance tests have been conducted in recent years. There is also the quality consideration of refractory bricks, which are not as important as other physical and physical indicators.
The materials of refractory fire bricks are divided into acidic, alkaline and neutral, and the fire resistance is also different from 1600-2000℃. For example, clay bricks have lower aluminum content and liquid phase, and their service temperature and fire resistance are relatively low. High alumina bricks have high aluminum content, high load softening temperature, and increased fire resistance.
The low fire resistance is due to the low oxide liquid phase in the product, which reduces the fire resistance and is closely related to the raw material matrix and combustion temperature. For example, the magnesium series in alkaline refractory bricks has a high volume density, high combustion temperature, and increased fire resistance. There are also silica bricks in the acid series products. Although the expansion coefficient is large, the fire resistance is much higher than that of clay bricks. The higher the fire resistance, the higher the service temperature. For example, the fire resistance of neutral series high alumina bricks is above 1700°C and the use temperature is above 1350°C. The fire resistance of corundum bricks is above 1800°C and the use temperature is above 1400°C. The fire resistance of alkaline series refractory firebricks is above 2000°C and the use temperature is above 1800°C. at 1700℃.
The slag resistance of refractory bricks increases with the increase of main content. The higher the main index and the lower the impurities, the more conducive to improving corrosion resistance.
Refractory firebricks with a temperature above 1300°C are corrosion-resistant. The main index content of fire resistance of refractory fire bricks changes with the load softening temperature.
