Performance and application of chromium corundum

Source: | Author:ChangXing Refractory | Published time: 1557 days ago | 1098 Views | Share:

The main components of chromium corundum are Al2O3 and Cr2O3, which form a continuous solid solution. According to the Al2O3-Cr2O3 binary phase diagram, adding Cr2O3 to the Al2O3 single-phase material, not only did not reduce the refractoriness of the material, but the refractoriness increased with the content of Cr2O3 The increase of the increase.

Adding to the corundum material, as the temperature rises, Al2O3 and Cr2O3 gradually form a solid solution, so that the corundum particles and the matrix are tightly combined, and further form a ring-shaped solid solution zone on the surface of the corundum particles, so that the material is between the particles and the particles at high temperatures. The particles and fine powders are tightly combined, and the combined phase is aluminum-chromium solid solution phase, which has a high melting point and maintains the bonding strength even at high temperatures. Therefore, chromium corundum refractories have strong mechanical properties at room temperature and high temperature mechanics performance.

Cr2O3 is a high-quality component of refractory materials, which can form high melting point compounds with many oxides. For example, Cr2O3 and Al2O3 can form a continuous solid solution, the melting point of this solid solution is above 2050℃; Cr2O3 and MgO/FeO form high melting point magnesia-chromium spinel/chromium iron spinel; Cr2O3 and Cu2O can form a melting point above 1600℃ The compound; the melting temperature of the eutectic formed by Cr2O3 and SiO2 reaches 1720℃.

In addition, Cr2O3 can also increase the viscosity of the slag, and the increase of the slag viscosity can slow down the infiltration rate of the slag into the refractory. In summary, Cr2O3 can improve the slag erosion resistance and spalling performance of the refractory.

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