Corundum mullite brick is a kind of high alumina refractory material composed of corundum and mullite as the main crystal phase. Corundum mullite brick is formed by high pressure molding and high temperature firing using high-quality mullite, high-purity corundum as the main raw material. It has the characteristics of pure white appearance, accurate size, high load softening point, low porosity, good creep performance, thermal shock resistance and strong corrosion resistance. If you are in want of corundum mullite bricks, please contact us for more details right now!
The thermal conductivity of refractory bricks is one of the most important thermophysical properties of refractory materials. The thermal conductivity of corundum mullite bricks is 2.0, which is an ideal material for masonry high temperature and ultra high temperature kiln and can prolong the service life of kilns , especially applied in high temperature tunnel kiln. Generally speaking, the thermal conductivity of corundum mullite is its prominent advantage.
Corundum mullite bricks from RS factory have been fired by mixing, forming and drying at high temperature in the shuttle kiln. Corundum mullite bricks are featured with high refractoriness, good thermal shock resistance, good high temperature strength, excellent corrosion resistance, strong slag resistance, small expansion coefficient, low creep and anti-spalling, and are suitable for various high temperature furnaces.
Generally, the refractory product made of mullite granules as aggregate has good thermal shock resistance, but the corrosion resistance is slightly poor. On the contrary, the refractory product with corundum sand as the aggregate has good corrosion resistance, but the thermal shock resistance is slightly poor.
However, corundum mullite brick has the dual advantages of good thermal shock resistance and good corrosion resistance because it is composed of corundum and mullite as the main crystal phase. Therefore, it is mainly used in high-temperature hot blast stoves, as well as in glass melting furnaces and ceramic firing kiln.
Corundum Mullite Brick Manufacturing Process
Corundum mullite brick is usually made of synthetic mullite. In the process of manufacturing corundum mullite brick, mullite granules can be used as the aggregate, the α-Al2O3 powder is used as the powder, or the fused or sintered corundum granules can be used as the aggregate and the synthetic mullite powder is regarded as power. Then, the aggregate and powder are compounded according to a certain ratio and particle size level, sulfite pulp waste liquid is used as a binder, and the materials are fed in a certain order. Corundum mullite brick is formed by a friction brick press or a hydraulic press after fully mixing. Finally, it is fired under the temperature of 1650℃~1750℃ after the slab is dried.
Corundum brick refers to the refractory brick made of corundum as the main crystal phase, with fused corundum or sintered corundum as the main raw material, adding corundum powder and binder at high temperature. The alumina content of it is above 90%, and has a high load softening temperature, a high normal temperature compressive strength and excellent wear resistance.
Corundum bricks are mainly used in petrochemical industrial gasifiers, carbon black reactors, gasifiers, ammonia decomposing furnaces, two-stage reformers, high-temperature ultra-high temperature furnaces in the refractory ceramic industry, and blast furnaces in the metallurgical industry, etc.
We know the definition, properties and production process of corundum mullite bricks from above descriptions. Besides, corundum mullite bricks are mainly used in the key parts of industries kilns such as steel, electronics, petrochemical, fertilizer, non-ferrous metals, refractory materials.
In the production process, corundum brick and corundum mullite brick have sintering and electrofusion respectively. So The main refractory raw materials used are sintering raw materials and electrofusion raw materials. Different refractory raw materials and manufacturing process result in their price difference is also large.
In short, corundum mullite brick combines the advantages of corundum bricks and mullite bricks, but it sells at a lower price compared with corundum bricks, so it is selected in many kilns.
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