Patent ID: 7842633

Claim:
A high-zirconia cast refractory material which comprises: 85-95 wt % of ZrO 2 , 0.1 to less than 0.8 wt % of Al 2 O 3 , glass-forming oxides including 4-12 wt % of SiO 2 and 0.1-1.5 wt. % of B 2 O 3 , glass-modifying oxides including less than 0.04 wt % of Na 2 O, 0.01-0.15 wt % of K 2 O, 0.01-0.2 wt % of CaO, less than 0.4 wt % of BaO, and less than 0.2 wt % of SrO, 0.05-0.4 wt % of Y 2 O 3 , 0.3 wt % or less of total content of Fe 2 O 3 and TiO 2 , less than 0.01 wt. % CuO, and less than 0.01 wt % P 2 O 5 , wherein the molar ratio of the glass-forming oxides to the glass-modifying oxides is 20-100, and wherein said refractory material has an electric resistance of at least 200 Ω·cm after standing for 12 hours at 1500° C.