PRODUCT FROM CHROMIUM OXIDE Russian patent published in 2018 - IPC C04B35/12 C04B35/105 

FIELD: chemistry.

SUBSTANCE: sintered refractory product consists of an aggregate bound by a matrix, and contains oxides in percentage by weight: more than 65 of Cr₂O₃, less than 35 of Al₂O₃, 1 or more of ZrO₂, at least 20 wt % of which is stabilized in the cubic and/or tetragonal form, 0.1 or more of Y₂O₃, acting as a stabiliser of zirconium oxide ZrO₂, less than 1.9% of HfO₂, wherein the total content of chromium oxide, aluminium oxide, and zirconium oxide Cr₂O₃+Al₂O₃+ZrO₂ is more than 90 wt %. The product contains a coactivator that is active or inactive as a zirconium stabiliser selected from CaO, MgO,TiO_2, and mixtures thereof, wherein the total content of calcium oxide, magnesium oxide, and titanium oxide CaO+MgO+TiO₂ is less than 6.0 wt % and more than 0.5 wt %, and more than 50 wt % of yttrium oxide and co-activator are present in the matrix.

EFFECT: improving the stability of refractory materials for slag corrosion and temperature changes.

24 cl, 16 ex, 2 tbl