April 20, 2022
High aluminum bricks with the same aluminum content may not be of the same quality.
Because the aluminum content of high aluminum brick is only one of the indicators to distinguish the quality, the same as the aluminum content, but also look at the volume density, the higher the volume density, the higher the density of high aluminum brick, the higher the wear resistance; But also look at the size of high aluminum brick and whether there are internal cracks; The size should be regulated by the national standard to expand or close the ruler range can be regarded as qualified. There are cracks, depending on whether it is lamellar or surface mesh cracks.
If the surface of the high aluminum brick is just a mesh crack, it is caused by too high temperature or too fast drying in the drying process, which generally affects the internal use. If it is lamination, it will not work, because the internal structure has occurred fault, it can not be used.
Although the aluminum content is the main index, but the load softening temperature of high aluminum brick is also very important, if the temperature of sintering is high, it means that the raw material is good and the internal quality is dense, and the load softening temperature is high. If the sintering temperature is low, the softening temperature under load is low. Volume density and softening temperature under load can best prove the quality of high aluminum bricks.
Under normal circumstances, the softening temperature under load can not be seen or weighed out, and the volume density is the most intuitive can weigh the density of high aluminum brick, that is, the most direct judgment of the inner quality of high aluminum brick a method. The heavier the firebrick, the higher the volume density.
And the user that a few not understand a situation very much, often can see color and aluminous content to judge the stand or fall of high aluminous brick quality only, it is unscientific. Some of the high-aluminum bricks are particularly beautiful in color and are very uniform, and the sizes are in a reasonable range. But the quality is light, this explains this batch of high aluminum brick is to use raw aluminum powder to adjust the color of the brick, and the intrinsic quality is not compared with cooked powder. Because the color of raw aluminum powder added to the brick looks good, but when used at high temperature, the wear resistance and high temperature resistance are not as good as the use effect of high aluminum brick produced by adding clinker.
Therefore, to determine the quality of high aluminum brick and times, must look at the volume density of the softening temperature to determine the load.