High-resistance high-zirconia cast refractory material

Details High-resistance high-zirconia cast refractory material High-resistance high-zirconia cast refractory material

2008-12-16

2010-11-30

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Refractory

C501S107000

Reexamination Certificate

active

07842633

ABSTRACT:
A high-zirconia cast refractory material which contains 85-95 wt % of ZrO2, 4-12 wt % of SiO2, 0.1 to less than 0.8 wt % of Al2O3, less than 0.04 wt % of Na2O, 0.01-0.15 wt % of K2O, 0.1-1.5 wt % of B2O3, 0.01-0.2 wt % of CaO, less than 0.4 wt % of BaO, less than 0.2 wt % of SrO, 0.05-0.4 wt % of Y2O3, and 0.3 wt % or less of Fe2O3and TiO2together, but does not substantially contain CuO and P2O5(less than 0.01 wt %), such that the molar ratio of the glass-forming oxides (such as SiO2and B2O3) to the glass-modifying oxides (such as Na2O, K2O, CaO, MgO, SrO, and BaO) is 20-100, said refractory material having an electric resistance being 200 Ω·cm or higher after standing for 12 hours at 1500° C.

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