As we all know, chrome corundum bricks have better high-temperature resistance, and slag corrosion resistance, especially the corrosion resistance of molten cinders is more effective than low silicon corundum bricks. Another distinctive feature of chrome corundum brick is that its color is red. Why is this?

Chrome corundum bricks refer to corundum refractory bricks products containing Cr2O3. The main mineral composition is α-Al2O3-Cr2O3 solid solution.

Because chrome corundum bricks are mainly made of corundum with chrome green. Its appearance color is green at the initial stage of molding. But through high-temperature sintering, the appearance color will become red or even purple-red after reaction with CO. The color change is determined by the level of chromium content. The load-resistant softening temperature of chrome corundum bricks is very high. During the sintering process, Al2O3 and Cr2O3 can form a continuous solid solution without the production of eutectic. Therefore, adding Cr2O3 to the high-purity corundum material, regardless of the amount added, will not only not reduce the fire resistance of the material, but will increase the fire resistance of the material. The refractoriness (>1790℃) and load softening temperature (>1700℃) of chrome corundum bricks are better than those of high-purity corundum products.

The above is the reason why the chrome corundum brick is red. If you want to know more about chrome corundum bricks, or you need to buy chrome corundum bricks, please contact Rongsheng. We will provide you with services according to your specific needs.