Characteristic of Chromium Corundum

The main components of chromium corundum are Al2O3 and Cr2O3, which form continuous solid solution. According to the binary phase diagram of Al2O3-Cr2O3, adding Cr2O3 into AI2O3 single-phase material does not reduce the refractoriness of the material, but increases with the increase of the content of Cr2O3.

Cr2O3 is added in the corundum material, with the increase of temperature, Al2O3 and Cr2O3 gradually form a solid solution, make the corundum particles and matrix together, further in corundum particles form a solid solution of annular belt, make the material at high temperature between the particle and particle, combining between particles and fine powder, and combined with phase for chrome aluminum solid solution phase, high melting point,  Even at high temperature, it still maintains the bonding strength, so the chromium-rigid jade refractories have strong mechanical properties at room temperature and high temperature.

Cr2O3 is a high quality component of refractory materials and can form high melting point compounds with various oxides.  For example, Cr2O3 and Al2O3 can form continuous solid solution with melting point above 2050°C.  Cr2O3 and MgO/FeO form magnesium-chromium spinel/chromite spinel with high melting point;  Cr2O3 and Cu2O can form compounds with melting point above 1600℃.  The melting temperature of low eutectic formed by Cr2O3 and SiO2 reaches 1720℃, And so on.

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