Patent ID: 7232780

Claim:
Yttria containing high-density chrome based refractory composites consisting of: (A) fused polymeric compounds as aggregates, containing: (a) 40 to 50 wt % of particles in size from 1 to 4 mm; (b) 15 to 25 wt % of particles in size below 1 mm; (B) matrix consisting of fused polymeric compounds with particle sizes of below 66 μm, active sintered Al 2 O 3 , active industrial Cr 2 O 3 and Y 2 O 3 containing as follows: (a) 16 to 25 wt % of fused polymeric compound particles in size below 66 μm; (b) 3 to 7 wt % of active sintered Al 2 O 3 particles in size below 5 μm; (c) 4 to 9 wt % of active industrial Cr 2 O 3 particles in size below 44 μm; (d) 0.2 to 5 wt % of Y 2 O 3 particles in size below 44 μm; (e) binders being added accounting for 2.5 to 3.5 wt %.