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The difference between corundum brick and chrome corundum brick

Corundum bricks are refractory bricks with an alumina content greater than 90%. Corundum bricks are divided into sintered corundum bricks and fused corundum bricks, while chrome corundum bricks participate in Cr2O3 refractory bricks in corundum. Chrome corundum bricks are divided into fused cast chromium corundum bricks and There are two kinds of sintered chrome corundum bricks. Corundum bricks are used in industrial kilns under high temperature, high pressure and other environments. Both corundum bricks and chrome corundum bricks have the same or different points.


Fire resistance In Cr2O3 in corundum materials, not only does it not reduce the fire resistance of the materials department, but also makes the fire resistance of the materials improve. Chrome corundum bricks are superior to corundum bricks in fire resistance greater than 1790℃ and load softening temperature greater than 1700℃. The compressive strength of corundum bricks is 70-100MPa at room temperature, and the high-temperature chromium corundum bricks are generally greater than the compressive strength at room temperature. 150MPa, obviously higher than corundum brick.

During the firing process of corundum bricks and chrome corundum bricks, between particles and particles, between particles and fine powder, between fine powder and fine powder constitute Al2O3-Cr2O3 solid solution, the solid solution is like a bridge. The connection of the powder greatly improves the strength of the data, and the thermal shock stability participates in Cr2O3 in corundum when the Cr2O3 content is 10%-66%.

The thermal shock stability of the data decreases with the increase of Cr2O3 content, that is, the chromium corundum brick with low Cr2O3 content is better than the chromium corundum brick with high Cr2O3 content. The high-performance chromium corundum brick has a Cr2O3 content of 12%-20%, and its thermal shock stability is improved compared with corundum bricks; especially the AKZ type chromium corundum bricks consumed by participating in a small amount of additives that produce phase transitions have stable thermal shock Sex is better.

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