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Comparison of the Performance of Chrome Corundum Porous Bricks and Corundum-Spinel Porous Bricks

2024-12-11

Chrome corundum, as a traditional material for ladle porous bricks, has played a crucial role for a long time. However, as previously mentioned, the insufficient thermal shock resistance of traditional chrome corundum bricks often leads to cracks during use. These cracks allow molten steel to easily penetrate the brick, resulting in steel infiltration, which can severely impact the argon-blowing performance. Additionally, chromium poses environmental pollution concerns. As a result, chrome corundum porous bricks have gradually been replaced by corundum-spinel porous bricks with superior performance. However, chrome corundum porous bricks still exhibit better structural stability and slag penetration resistance compared to corundum-spinel porous bricks.

The material of chrome corundum is primarily made from sintered tabular corundum with a dense structure, low porosity, and easy sinterability. As shown in Table 1, there are some performance differences between the two types of porous bricks. Generally, under the same particle size distribution, the bulk density of corundum-spinel porous bricks is smaller than that of chrome corundum porous bricks. The porosity of corundum-spinel porous bricks is lower than that of chrome corundum porous bricks due to the volume expansion caused by spinel formation during sintering, which offsets some of the shrinkage caused by fine powders, thus reducing the porosity.

On the other hand, the linear dimensional change rate of corundum-spinel porous bricks is slightly larger than that of chrome corundum porous bricks. In other words, the volume stability of corundum-spinel porous bricks is inferior to that of chrome corundum bricks, mainly because magnesium-aluminum spinel is generated during the sintering process of corundum-spinel porous bricks. Since the slotted porous bricks have narrow slots, typically around 200 μm, significant volume changes during sintering may affect the slot dimensions, ultimately impacting airflow and argon-blowing performance, resulting in decreased performance, reduced efficiency, or even failure to blow through.

Due to the better thermal stability of spinel compared to corundum, the thermal shock resistance of corundum-spinel porous bricks is superior to that of chrome corundum porous bricks. Both have the same slag erosion resistance index, but chrome corundum bricks exhibit stronger slag penetration resistance than corundum-spinel bricks. Overall, in terms of performance, corundum-spinel porous bricks surpass traditional chrome corundum porous bricks and have gradually replaced them, becoming the mainstream ladle porous brick material today.

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