Corundum Mullite Refractory - Corundum Bricks & Mullite Bricks
Corundum bricks and mullite bricks are both high-grade materials in the field of refractory materials, and also belong to the alumina series refractory. In contrast, corundum bricks have a smaller expansion coefficient than mullite bricks. Corundum brick has a high melting point, stable high-temperature performance, and good wear resistance. Mullite bricks are similar to high alumina refractory bricks. Corundum Mullite Refractory - Corundum Bricks & Mullite bricks. There are two kinds of mullite, one is mullite produced by clinker with high aluminum content at high temperature, and the other is mullite brick made of mullite and fired at high temperature. Especially the refractory bricks with mullite added, the sintering temperature is above 1700 ℃, can form a protective film at high temperature, and has good flexibility.
The expansion coefficient of corundum brick and mullite brick
The high-temperature expansion of refractory brick refers to the high-temperature performance of the brick, and the expansion coefficient refers to the relative change ratio of the refractory brick when the temperature rises. Refractory bricks will expand in volume after heating, but also according to the composition of different minerals, the thermal expansion coefficient is also different. Corundum Mullite Refractory - Corundum Bricks & Mullite bricks. The thermal expansion of clay bricks, high alumina bricks, and magnesia bricks are relatively large. But silica brick has a larger expansion coefficient due to polycrystalline transformation.
The larger the coefficient of thermal expansion, the more unmanageable the size of the refractory brick is, and the thermal stability also has an impact. The larger the coefficient of thermal expansion, the greater the internal stress generated by the refractory brick after being heated, and it is easy to be damaged when the temperature changes rapidly. The smaller the expansion coefficient, the smaller the volume change caused by the crystallization, crystal transformation, and continuous sintering of the refractory brick under the action of high temperature.
The expansion coefficient is one of the important indicators of refractory bricks, and the volume of refractory bricks will change due to the influence of temperature during use. It will seriously affect the compactness of the size of the refractory brick. Under normal circumstances, when refractory bricks are built, expansion joints should be left according to different materials of bricks. If the expansion coefficient is too large and it is not dealt with in time, the furnace body will be cracked due to the expansion of the bricks, which will affect the use.
There are many types of refractory bricks with different expansion coefficients. Comparing corundum bricks and mullite bricks, the expansion rate of corundum bricks is smaller than that of mullite. Corundum Mullite Refractory - Corundum Bricks & Mullite bricks, as alumina series refractory materials, are widely used in the refractory lining of thermal furnaces. Search https://highaluminarefractory.com/ and click to get more information on high alumina series refractory bricks.
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