The most important performance of micro-expansion high alumina bricks is the structural strength at high temperature and the high alumina bricks are not deformed.
The ordinary high aluminum brick is determined by the load softening temperature and high-temperature creep to determine its quality. In addition, due to volume stability, the high alumina bricks will shrink the bricks and cause erosion to expand. When subjected to cooling and high temperature thermal cycles, the thermal shock resistance is poor, and it can also cause the high aluminum brick to peel off.
Micro-expanded high alumina bricks have good thermal shock resistance. During use, they expand slightly, so as not to squeeze the brick joints, and the slag resistance is also very strong. Moreover, the micro-expansion high-alumina brick has high load softening point, anti-stripping, corrosion resistance, resistance to rapid cooling and heat, erosion resistance, and no pollution.
Micro-expansion high alumina bricks use high-alumina bauxite clinker as the main raw material, use "three stone" minerals and pyrophyllite as the expansion agent, and add some high aluminum fine powder and corundum fine powder as additives. The high-pressure forming of the press is made according to the production process of high-alumina bricks.
In the production process of micro-expansion high alumina bricks, it is necessary to choose expansion materials of suitable particle size, control the firing temperature, use the expansion of the material to adjust the structure to balance the shrinkage of the high alumina brick body under heat load, and make the product at low temperature During the firing process, the size is slightly swollen, reducing the occurrence of cracks.
High alumina bricks will have corresponding expansion effects due to different operating temperatures. To squeeze the brick joints, the overall compactness of the high alumina bricks should be improved. From the improvement of thermal shock stability, the high alumina bricks can resist the penetration of slag and increase the service life. .
The micro expansion high alumina brick is mainly used in the working layer, permanent layer and electric furnace roof of the ladle and mixed iron car, and the use effect is better. The use of expanded high alumina bricks in cement rotary kilns has also gradually expanded.
