High-resistance high-zirconia cast refractory material
AssigneeSaint-Gobain TM K.K.
InventorsNobuo Tomura, Shigeo Endo, Yasuo Misu
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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 Fe2O3 and TiO2 together, 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 SiO2 and 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.
Claims10
A high-zirconia cast refractory material which comprises:
- 85-95 wt % of ZrO2,
- 0.1 to less than 0.8 wt % of Al2O3,
- glass-forming oxides including 4-12 wt % of SiO2 and 0.1-1.5 wt. % of B2O3,
- glass-modifying oxides including less than 0.04 wt % of Na2O, 0.01-0.15 wt % of K2O, 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 Y2O3,
- 0.3 wt % or less of total content of Fe2O3 and TiO2,
- less than 0.01 wt. % CuO, and
- less than 0.01 wt % P2O5,
- 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.
A high-zirconia cast refractory material which comprises:
- 85-92 wt % of ZrO2,
- 0.4 to less than 0.8 wt % of Al2O3,
- glass-forming oxides including 6-12 wt % of SiO2 and 0.3-1.2 wt. % of B2O3,
- glass-modifying oxides including less than 0.02 wt % of Na2O, 0.01-0.1 wt % of K2O, 0.01-0.2 wt % of CaO, less than 0.3 wt % of BaO, less than 0.1 wt % of SrO,
- 0.05-0.2 wt % of Y2O3,
- 0.3 wt % or less of total content of Fe2O3 and TiO2,
- less than 0.01 wt % CuO, and
- less than 0.01 wt % P2O5,
- wherein the molar ratio of the glass-forming oxides to the glass-modifying oxides is 25-100, and
- and wherein said refractory material has an electric resistance of at least 300 Ω·cm after standing for 12 hours at 1500° C.
Dependencies are inferred from the claim text.