From the performance introduction of the aforementioned corundum mullite bricks and composite brown corundum bricks, it can be known that the improved second-generation low-porosity corundum mullite bricks and the fourth-generation microporous composite brown corundum bricks have both physical and chemical indicators. To reach a considerable level, the excellent performance of the two products mainly depends on the microstructure.
Corundum mullite bricks mainly use the characteristics of the crystal structure of fused white corundum and fused mullite. Various composite additives are added to the matrix. Under the action of high temperature, the main crystalline phase is corundum and the secondary crystalline phase is formed. Or prismatic mullite, the main crystalline phases are piled up to form a framework, the secondary crystalline phases are interspersed between the main crystalline phases, and the matrix of a variety of composite additives is filled in the voids of the interlocking grid of the primary and secondary crystalline phases to make the ceramic material Form a tightly and firmly combined overall structure, so as to achieve its excellent physical and chemical properties.
The composite brown corundum brick mainly uses the crystal structure characteristics of the fused brown corundum, which acts as a skeleton in the product to form β-SiC and the brown corundum particles to bond together, so that the product forms a firm structure, so as to achieve the ideal physical and chemical indicators. Not only does the product have high mechanical properties, but the formed β-SiC phase blocks the pores and makes the product dense and has a low apparent porosity. It is the result of the best combination of the excellent properties of the raw materials themselves.
Corundum mullite bricks and composite brown corundum bricks have different main ways to achieve the above properties, which will inevitably lead to different use characteristics. For example, the corrosion resistance of blast furnace slag. According to the test results, it can be known that corundum mullite bricks are almost not corroded, yellow corundum mullite bricks are second to corundum mullite, and the slag erosion index of composite brown corundum bricks is> 8%; Corundum mullite bricks and yellow corundum mullite bricks have better resistance to hot metal erosion than composite brown corundum bricks. The reason for this situation must be closely related to the nature of the two raw materials and the difference in organization structure.
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