Why different refractory bricks have different refractory temperature?
Different refractory bricks have different refractory temperature because of different raw materials and different firing temperatures.
In the production of refractory materials, the refractory temperature test has basically not been done in recent years. The reason is that the production process is mature and the refractory temperature can be achieved. In addition, in the quality consideration of refractory bricks, the refractory temperature is not as important as other physical and chemical indicators and physical indicators.
The materials of refractory bricks are acidic, alkaline and neutral, and the refractory temperature is also different from 1600-2000℃. For example, the aluminum content of clay bricks is relatively low, and the service temperature and refractory temperature are relatively low. High alumina bricks have high aluminum content, high load softening temperature, and higher refractory temperature.
The low refractory temperature is also closely related to the matrix of the raw material and the firing temperature. For example, the magnesia series in alkaline refractory bricks have high bulk density, high firing temperature and higher refractory temperature. There are also silica bricks in acidic products. Although the expansion coefficient is large, the refractory temperature is much higher than that of clay bricks.
The higher the refractory temperature, the higher the service temperature. For example, the neutral series of high-alumina bricks have a refractory temperature above 1700℃, the use temperature is 1350℃, the corundum bricks have a refractory temperature above 1800℃, and the service temperature is above 1400℃. The alkaline series of refractory bricks have a refractory temperature above 2000℃. , The use temperature is 1700℃.
The slag resistance of refractory bricks increases as the main content increases. The higher the main index, the lower the impurity, and the better it is to improve the corrosion resistance.
Products whose service temperature of refractory bricks are above 1300℃ have anti-corrosion function. The main index content of refractory bricks varies with the softening temperature of the load.